US20110178753A1 - Portable Articulated Arm Coordinate Measuring Machine and Integrated Environmental Recorder - Google Patents
Portable Articulated Arm Coordinate Measuring Machine and Integrated Environmental Recorder Download PDFInfo
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- US20110178753A1 US20110178753A1 US13/006,466 US201113006466A US2011178753A1 US 20110178753 A1 US20110178753 A1 US 20110178753A1 US 201113006466 A US201113006466 A US 201113006466A US 2011178753 A1 US2011178753 A1 US 2011178753A1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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- G05B19/401—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes
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- G01B11/005—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates coordinate measuring machines
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- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
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- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Definitions
- the present disclosure relates to a coordinate measuring machine, and more particularly to a portable articulated arm coordinate measuring machine having an integrated environmental recorder.
- Portable articulated arm coordinate measuring machines have found widespread use in the manufacturing or production of parts where there is a need to rapidly and accurately verify the dimensions of the part during various stages of the manufacturing or production (e.g., machining) of the part.
- Portable AACMMs represent a vast improvement over known stationary or fixed, cost-intensive and relatively difficult to use measurement installations, particularly in the amount of time it takes to perform dimensional measurements of relatively complex parts.
- a user of a portable AACMM simply guides a probe along the surface of the part or object to be measured. The measurement data are then recorded and provided to the user.
- the data are provided to the user in visual form, for example, three-dimensional (3-D) form on a computer screen.
- the articulated arm CMM includes a number of features including an additional rotational axis at the probe end, thereby providing for an arm with either a two-two-two or a two-two-three axis configuration (the latter case being a seven axis arm).
- An embodiment is a portable articulated arm coordinate measurement machine (AACMM) that includes a manually positionable articulated arm having opposed first and second ends, the arm including a plurality of connected arm segments, each of the arm segments including at least one position transducer for producing a position signal.
- the AACMM also includes a measurement device attached to a first end of the AACMM, and an electronic circuit for receiving the position signal from the transducers and for providing data corresponding to a position of the measurement device.
- the AACM further includes an environmental recorder in communication with the electronic circuit.
- the environmental recorder includes a sensor for outputting a value of a parameter, a memory, and logic executable by the environmental recorder to implement a method.
- the method includes monitoring the value of the parameter, and determining that the value of the parameter is outside of a programmable threshold.
- the value of the parameter and a timestamp are stored in the memory in response to the value of the parameter being determined to be outside of the programmable threshold.
- the contents of the memory are transmitted to the electronic circuit.
- Another embodiment is a method of implementing a portable AACMM.
- the method includes receiving a value of a parameter from a sensor located on the portable AACM.
- the portable AACMM includes a manually positionable articulated arm having opposed first and second ends.
- the arm includes a plurality of connected arm segments, each arm segment including at least one position transducer for producing a position signal.
- the portable AACMM also includes a measurement device attached to a first end of the portable AACMM, and an electronic circuit which receives the position signal from the transducers and provides data corresponding to a position of the measurement device.
- the received value of the parameter is monitored and it is determined that the value of the parameter is outside of a programmable threshold.
- the value of the parameter and a timestamp are stored in a memory located on an environmental recorder in response to the value of the parameter being determined to be outside of the programmable threshold.
- the contents of the memory are transmitted to the base computer processor.
- a further embodiment is a computer program product for implementing a portable AACMM.
- the computer program product includes a storage medium having computer-readable program code embodied thereon, which when executed by a computer causes the computer to implement a method.
- the method includes receiving a value of a parameter from a sensor located on the portable AACM.
- the portable AACMM includes a manually positionable articulated arm having opposed first and second ends.
- the arm includes a plurality of connected arm segments, each arm segment including at least one position transducer for producing a position signal.
- the portable AACMM also includes a measurement device attached to a first end of the portable AACMM, and an electronic circuit which receives the position signal from the transducers and provides data corresponding to a position of the measurement device.
- the received value of the parameter is monitored and it is determined that the value of the parameter is outside of a programmable threshold.
- the value of the parameter and a timestamp are stored in a memory located on an environmental recorder in response to the value of the parameter being determined to be outside of the programmable threshold.
- the contents of the memory are transmitted to the base computer processor.
- FIG. 1 including FIGS. 1A and 1B , are perspective views of a portable articulated arm coordinate measuring machine (AACMM) having embodiments of various aspects of the present invention therewithin;
- AACMM portable articulated arm coordinate measuring machine
- FIG. 2 is a block diagram of electronics utilized as part of the AACMM of FIG. 1 in accordance with an embodiment
- FIG. 3 is a block diagram describing detailed features of the electronic data processing system of FIG. 2 in accordance with an embodiment
- FIG. 4 is a block diagram describing detailed features of the environmental recorder of FIG. 3 in accordance with an embodiment
- FIG. 5 is a flow diagram describing a process performed by the environmental recorder when the AACMM is powered off in accordance with an embodiment
- FIG. 6 is a flow diagram describing a process performed by the environmental recorder when the AACMM is powered on in accordance with an embodiment.
- a portable articulated arm coordinate measuring machine that includes an environmental recorder is provided in accordance with exemplary embodiments.
- the environmental recorder provides data that may be useful in explaining any anomalous behavior of the AACMM.
- Data representing the history of the AACMM is recorded by the environmental recorder at various times, including from early in the manufacturing process, during time in inventory, during shipment of the product, and during subsequent handling and use at the site of an end user. This data can be read directly by an end user of the AACMM via an on-board operating system and display, or it can be extracted and saved on another computer.
- the environmental recorder is an independent, battery backed environmental monitoring system that is located on the AACMM.
- Data collected by the environmental recorder may be utilized to alert a user about an event and to suggest that a probe calibration and/or a single point articulation performance test (SPAT) be performed to see if the arm is still measuring to specification.
- the data collected by the environmental recorder is also used during system diagnostics and repair to determine a history of the AACMM in terms of environmental conditions.
- Environmental conditions include, but are not limited to: temperature, humidity, and shock (e.g., due to the AACMM being dropped).
- Sensors located on the environmental recorder output values of environmental condition parameters and their values are recorded periodically. In accordance with embodiments, the periodic recording occurs both when the AACMM is powered on and when the AACMM is powered off.
- the values of environmental condition parameters are recorded in response to an event such as an extreme humidity value (e.g., as defined by a programmable threshold) being detected at a sensor.
- an extreme humidity value e.g., as defined by a programmable threshold
- the recording of values that exceed thresholds occurs both when the AACMM is powered on and when the AACMM is powered off.
- FIGS. 1A and 1B illustrate, in perspective, a portable articulated arm coordinate measuring machine (AACMM) 100 according to various embodiments of the present invention, an articulated arm being one type of coordinate measuring machine.
- the exemplary AACMM 100 may comprise a six or seven axis articulated measurement device having a measurement probe housing 102 coupled to an arm portion 104 of the AACMM 100 at one end.
- the arm portion 104 comprises a first arm segment 106 coupled to a second arm segment 108 by a first grouping of bearing cartridges 110 (e.g., two bearing cartridges).
- a second grouping of bearing cartridges 112 couples the second arm segment 108 to the measurement probe housing 102 .
- a third grouping of bearing cartridges 114 couples the first arm segment 106 to a base 116 located at the other end of the arm portion 104 of the AACMM 100 .
- Each grouping of bearing cartridges 110 , 112 , 114 provides for multiple axes of articulated movement.
- the measurement probe housing 102 may comprise the shaft of the seventh axis portion of the AACMM 100 (e.g., a cartridge containing an encoder system that determines movement of the measurement device, for example a probe 118 , in the seventh axis of the AACMM 100 ).
- the base 116 is typically affixed to a work surface.
- Each bearing cartridge within each bearing cartridge grouping 110 , 112 , 114 typically contains an encoder system (e.g., an optical angular encoder system).
- the encoder system i.e., transducer
- the arm segments 106 , 108 may be made from a suitably rigid material such as but not limited to a carbon composite material for example.
- a portable AACMM 100 with six or seven axes of articulated movement provides advantages in allowing the operator to position the probe 118 in a desired location within a 360° area about the base 116 while providing an arm portion 104 that may be easily handled by the operator.
- an arm portion 104 having two arm segments 106 , 108 is for exemplary purposes, and the claimed invention should not be so limited.
- An AACMM 100 may have any number of arm segments coupled together by bearing cartridges (and, thus, more or less than six or seven axes of articulated movement or degrees of freedom).
- the probe 118 is detachably mounted to the measurement probe housing 102 , which is connected to bearing cartridge grouping 112 .
- a handle 126 is removable with respect to the measurement probe housing 102 by way of, for example, a quick-connect interface.
- the handle 126 may be replaced with another device (e.g., a laser line probe, a bar code reader), thereby providing advantages in allowing the operator to use different measurement devices with the same AACMM 100 .
- the probe housing 102 houses a removable probe 118 , which is a contacting measurement device and may have different tips 118 that physically contact the object to be measured, including, but not limited to: ball, touch-sensitive, curved and extension type probes.
- the measurement is performed, for example, by a non-contacting device such as a laser line probe (LLP).
- a non-contacting device such as a laser line probe (LLP).
- the handle 126 is replaced with the LLP using the quick-connect interface.
- Other types of measurement devices may replace the removable handle 126 to provide additional functionality. Examples of such measurement devices include, but are not limited to, one or more illumination lights, a temperature sensor, a thermal scanner, a bar code scanner, a projector, a paint sprayer, a camera, or the like, for example.
- the AACMM 100 includes the removable handle 126 that provides advantages in allowing accessories or functionality to be changed without removing the measurement probe housing 102 from the bearing cartridge grouping 112 .
- the removable handle 126 may also include an electrical connector that allows electrical power and data to be exchanged with the handle 126 and the corresponding electronics located in the probe end.
- each grouping of bearing cartridges 110 , 112 , 114 allows the arm portion 104 of the AACMM 100 to move about multiple axes of rotation.
- each bearing cartridge grouping 110 , 112 , 114 includes corresponding encoder systems, such as optical angular encoders for example, that are each arranged coaxially with the corresponding axis of rotation of, e.g., the arm segments 106 , 108 .
- the optical encoder system detects rotational (swivel) or transverse (hinge) movement of, e.g., each one of the arm segments 106 , 108 about the corresponding axis and transmits a signal to an electronic data processing system within the AACMM 100 as described in more detail herein below.
- Each individual raw encoder count is sent separately to the electronic data processing system as a signal where it is further processed into measurement data.
- No position calculator separate from the AACMM 100 itself e.g., a serial box
- the base 116 may include an attachment device or mounting device 120 .
- the mounting device 120 allows the AACMM 100 to be removably mounted to a desired location, such as an inspection table, a machining center, a wall or the floor for example.
- the base 116 includes a handle portion 122 that provides a convenient location for the operator to hold the base 116 as the AACMM 100 is being moved.
- the base 116 further includes a movable cover portion 124 that folds down to reveal a user interface, such as a display screen.
- the base 116 of the portable AACMM 100 contains or houses an electronic data processing system that includes two primary components: a base processing system that processes the data from the various encoder systems within the AACMM 100 as well as data representing other arm parameters to support three-dimensional (3-D) positional calculations; and a user interface processing system that includes an on-board operating system, a touch screen display, and resident application software that allows for relatively complete metrology functions to be implemented within the AACMM 100 without the need for connection to an external computer.
- a base processing system that processes the data from the various encoder systems within the AACMM 100 as well as data representing other arm parameters to support three-dimensional (3-D) positional calculations
- a user interface processing system that includes an on-board operating system, a touch screen display, and resident application software that allows for relatively complete metrology functions to be implemented within the AACMM 100 without the need for connection to an external computer.
- the electronic data processing system in the base 116 may communicate with the encoder systems, sensors, and other peripheral hardware located away from the base 116 (e.g., a LLP that can be mounted to the removable handle 126 on the AACMM 100 ).
- the electronics that support these peripheral hardware devices or features may be located in each of the bearing cartridge groupings 110 , 112 , 114 located within the portable AACMM 100 .
- FIG. 2 is a block diagram of electronics utilized in an AACMM 100 in accordance with an embodiment.
- the embodiment shown in FIG. 2 includes an electronic data processing system 210 including a base processor board 204 for implementing the base processing system, a user interface board 202 , a base power board 206 for providing power, a Bluetooth module 232 , and a base tilt board 208 .
- the user interface board 202 includes a computer processor for executing application software to perform user interface, display, and other functions described herein.
- each encoder system generates encoder data and includes: an encoder arm bus interface 214 , an encoder digital signal processor (DSP) 216 , an encoder read head interface 234 , and a temperature sensor 212 .
- DSP digital signal processor
- Other devices, such as strain sensors, may be attached to the arm bus 218 .
- the probe end electronics 230 include a probe end DSP 228 , a temperature sensor 212 , a handle/LLP interface bus 240 that connects with the handle 126 or the LLP 242 via the quick-connect interface in an embodiment, and a probe interface 226 .
- the quick-connect interface allows access by the handle 126 to the data bus, control lines, and power bus used by the LLP 242 and other accessories.
- the probe end electronics 230 are located in the measurement probe housing 102 on the AACMM 100 .
- the handle 126 may be removed from the quick-connect interface and measurement may be performed by the laser line probe (LLP) 242 communicating with the probe end electronics 230 of the AACMM 100 via the handle/LLP interface bus 240 .
- the electronic data processing system 210 is located in the base 116 of the AACMM 100
- the probe end electronics 230 are located in the measurement probe housing 102 of the AACMM 100
- the encoder systems are located in the bearing cartridge groupings 110 , 112 , 114 .
- the probe interface 226 may connect with the probe end DSP 228 by any suitable communications protocol, including commercially-available products from Maxim Integrated Products, Inc. that embody the 1-wire® communications protocol 236 .
- FIG. 3 is a block diagram describing detailed features of the electronic data processing system 210 of the AACMM 100 in accordance with an embodiment.
- the electronic data processing system 210 is located in the base 116 of the AACMM 100 and includes the base processor board 204 , the user interface board 202 , a base power board 206 , a Bluetooth module 232 , and a base tilt module 208 .
- the base processor board 204 includes the various functional blocks illustrated therein.
- a base processor function 302 is utilized to support the collection of measurement data from the AACMM 100 and receives raw arm data (e.g., encoder system data) via the arm bus 218 and a bus control module function 308 .
- the memory function 304 stores programs and static arm configuration data.
- the base processor board 204 also includes an external hardware option port function 310 for communicating with any external hardware devices or accessories such as an LLP 242 .
- a real time clock (RTC) and log 306 , a battery pack interface (IF) 316 , and a diagnostic port 318 are also included in the functionality in an embodiment of the base processor board 204 depicted in FIG. 3 .
- the base processor board 204 also manages all the wired and wireless data communication with external (host computer) and internal (display processor 202 ) devices.
- the base processor board 204 has the capability of communicating with an Ethernet network via an Ethernet function 320 (e.g., using a clock synchronization standard such as Institute of Electrical and Electronics Engineers (IEEE) 1588), with a wireless local area network (WLAN) via a LAN function 322 , and with Bluetooth module 232 via a parallel to serial communications (PSC) function 314 .
- the base processor board 204 also includes a connection to a universal serial bus (USB) device 312 .
- USB universal serial bus
- the base processor board 204 transmits and collects raw measurement data (e.g., encoder system counts, temperature readings) for processing into measurement data without the need for any preprocessing, such as disclosed in the serial box of the aforementioned '582 patent.
- the base processor 204 sends the processed data to the display processor 328 on the user interface board 202 via an RS485 interface (IF) 326 .
- the base processor 204 also sends the raw measurement data to an external computer.
- the angle and positional data received by the base processor is utilized by applications executing on the display processor 328 to provide an autonomous metrology system within the AACMM 100 .
- Applications may be executed on the display processor 328 to support functions such as, but not limited to: measurement of features, guidance and training graphics, remote diagnostics, temperature corrections, control of various operational features, connection to various networks, and display of measured objects.
- the user interface board 202 includes several interface options including a secure digital (SD) card interface 330 , a memory 332 , a USB Host interface 334 , a diagnostic port 336 , a camera port 340 , an audio/video interface 342 , a dial-up/cell modem 344 and a global positioning system (GPS) port 346 .
- SD secure digital
- the electronic data processing system 210 shown in FIG. 3 also includes a base power board 206 with an environmental recorder 362 for recording environmental data.
- the base power board 206 also provides power to the electronic data processing system 210 using an AC/DC converter 358 and a battery charger control 360 .
- the base power board 206 communicates with the base processor board 204 using inter-integrated circuit (I2C) serial single ended bus 354 as well as via a DMA serial peripheral interface (DSPI) 356 .
- I2C inter-integrated circuit
- DSPI DMA serial peripheral interface
- the base power board 206 is connected to a tilt sensor and radio frequency identification (RFID) module 208 via an input/output (I/O) expansion function 364 implemented in the base power board 206 .
- RFID radio frequency identification
- all or a subset of the components may be physically located in different locations and/or functions combined in different manners than that shown in FIG. 3 .
- the base processor board 204 and the user interface board 202 are combined into one physical board.
- the AACMM 100 includes the integrated electronic data processing system 210 described above.
- the electronic data processing system 210 resides onboard, and is integrated with, the AACMM 100 and its components.
- the base processor board 204 includes a base computer processor, which may be implemented by the processor function 302 illustrated in FIG. 3 .
- the base computer processor performs user-selected functions in response to requests received via the AACMM 100 , which functions are described further herein.
- the functions are performed via one or more applications (e.g., logic) executed by the base computer processor and stored, e.g., in memory 304 of FIG. 3 .
- the requests may be received at the AACMM 100 via the onboard user interface board 202 illustrated in FIG.
- an external computer processor that is remotely located from the AACMM 100 and communicates with the AACMM 100 either directly through a USB channel, over an Ethernet network, or wirelessly, e.g., over a wireless LAN or BluetoothTM-enabled channel 232 , as illustrated generally in FIG. 2 .
- various components e.g., encoders 214 / 216 / 234 , probe end electronics 230 , and/or peripheral devices (e.g., LLP 242 ) are activated and collect data responsive to the requests.
- Information derived by the data is returned to the base computer processor, and forwarded to a destination device as described further herein.
- the environmental recorder 362 includes a battery 410 for providing electrical power to components of the environmental recorder 362 for an extended period of time (e.g., five to six months) without the need for external power.
- the battery 410 may be implemented using any battery sized to fit on the environmental recorder 362 and capable of holding a charge for an extended period of time.
- the battery 410 is charged when the AACMM 100 is connected to external power for operation or if present, from a secondary (re-chargeable) AACMM battery pack, whether connected to external power or not. Having a dedicated battery 410 in the environmental recorder 362 allows the environmental recorder 362 to operate when the AACMM 100 is powered off (e.g., in a power off state).
- the environmental recorder 362 also includes a clock 406 for maintaining the date and time of day.
- the clock 406 is used to generate a timestamp for events that are logged as well as to measure time intervals.
- Commercially available clocks such as, but not limited to, a crystal driven clock may be utilized by embodiments.
- the environmental recorder 362 depicted in FIG. 4 includes various sensors: an impact sensor 402 , a humidity sensor 414 , and a temperature sensor 412 . These sensors are examples of the types of sensors that may be utilized by the environmental recorder 362 and are not intended to be limiting as other types of sensors (e.g., vibration sensors, atmospheric pressure sensors, etc.) may also be implemented.
- An embodiment of the impact sensor 402 is implemented by two or more accelerometers: a first accelerometer designed to detect and measure very small accelerations (or vibrations); and a second accelerometer designed to detect and measure larger accelerations.
- a first accelerometer designed to detect and measure very small accelerations (or vibrations); and a second accelerometer designed to detect and measure larger accelerations.
- accelerometers measure acceleration in terms of gravitational force (g-force), and thus, the impact sensor 402 measures a g-force parameter.
- Any suitable accelerometers known in the art for detecting a shock or impact may be utilized by exemplary embodiments described herein, including, but not limited to three-axis micro electro-mechanical systems (MEMS), gravitometers, piezoresistive accelerometers, and capacitive accelerometers.
- MEMS micro electro-mechanical systems
- a g-force value detected by the first accelerometer that is greater than a present threshold causes the environmental recorder 362 to store the values of the g-force along with a timestamp.
- This programmable g-force threshold value may be updated during manufacturing or initialization of the AACMM 100 .
- the parameter measured by the temperature sensor 412 is ambient temperature, and the temperature sensor 412 is implemented by a commercially available temperature sensor.
- a temperature value that is greater than 45 degrees Celsius or less than 5 degrees Celsius causes the environmental recorder 362 to store the value of the temperature along with a timestamp.
- This programmable temperature threshold value may be updated during manufacturing or initialization of the AACMM 100 .
- a humidity parameter is measured by the humidity sensor 414 , and the humidity sensor 414 is implemented by a commercially available humidity sensor.
- a humidity value that is greater than 80% or less than 20% causes the environmental recorder 362 to store the value of the humidity along with a timestamp.
- This programmable humidity threshold value may be updated during manufacturing or initialization of the AACMM 100 .
- the processor 408 controls a programmable time interval for recording values of the parameters from the sensors, the reading of sensors, and the recording or storage of the values and timestamps into the memory 404 .
- the values of parameters measured by the sensors cause the environmental recorder 362 to activate the recording of the parameter value at the moment of an event (or shortly thereafter) regardless of the monitoring schedule of that sensor.
- An alert may also be sent to an operator of the system (e.g., via the LCD 338 ) in response to the event being detected.
- the processor 408 controls the periodic transmission of contents of the memory 404 to the base processor board 204 . In an embodiment, the transmission is across an inter-integrated circuit (I 2 C) bus, and the processor is implemented by a commercially available processor.
- the processor 408 controls the processing described herein using hardware instructions, software instructions or a combination of both.
- the memory 404 stores the recorded values of the parameters and their associated timestamps. In addition, the memory 404 may store the programmable threshold values associated with the parameters.
- the memory 404 is implemented by a commercially available memory such as, but not limited to: flash and direct random access memory (SRAM).
- SRAM direct random access memory
- the size of the memory 404 dictates how many parameter values and timestamps may be stored at the environmental recorder 362 before requiring a transmission of contents of the memory 404 to the base processor board 204 .
- FIG. 4 shows the impact sensor 402 , memory 404 , clock 406 , processor 408 , battery 410 , temperature sensor 412 , and humidity sensor 414 located on the environmental recorder 362 .
- all or a subset of these elements are located outside of the environmental recorder 362 on the AACMM 100 with communication between the elements being provided via a network or bus.
- the environmental recorder 362 utilizes multiple processors, clocks, and sensors.
- the lowest level system runs continuously and detects basis events that then bring up the next processor and sensor set.
- a third processor comes into play to interface to the environmental recorder 362
- a fourth processor comes up to allow retrieval and display of data.
- a flow diagram describing a process performed by the environmental recorder 362 when the AACMM is in a low power mode (e.g., powered off, reduced power) is generally shown.
- the processing is facilitated by computer instructions, or logic, located in the processor 408 .
- the values of parameters output by the sensors located on the environmental recorder 362 such as impact sensor 402 and/or temperature sensor 412 are monitored.
- the environmental recorder 362 while the monitoring and detecting are being performed, the environmental recorder 362 is in a low power mode where the memory 404 is not accessible. At step 506 , the environmental recorder 362 is put into a high power mode to allow access to the memory 404 .
- the values of the parameter(s) along with a timestamp are stored to the memory 404 at step 508 . In an embodiment, values of all of the parameters being measured by the sensors are stored to the memory 404 at step 508 .
- step 508 is repeated a programmable number of times or for a programmable amount of time when the event detected at step 504 is that a threshold has been exceeded.
- space in the memory 404 is conserved, by performing step 508 only if the current value of the parameter is different from a previous value of the parameter.
- the environmental recorder 362 is put into the low power mode.
- the low power mode includes portions of the environmental recorder 362 that are not used for the monitoring and detecting being powered off. Processing then continues at step 502 .
- a flow diagram describing a process performed by the environmental recorder 362 when the AACMM is powered on is generally shown.
- the processing is facilitated by computer instructions, or logic, located in the processor 408 .
- the values of parameters output by the sensors located on the environmental recorder 362 such as impact sensor 402 and/or temperature sensor 412 are monitored.
- the values of the parameter(s) along with a timestamp are stored to the memory 404 at step 606 .
- values of all of the parameters being measured by the sensors are stored to the memory 404 at step 606 .
- all of the parameter values are stored to memory 404 when the event detected at step 604 is that a programmable time interval has expired, and only the value of the parameter causing the event to be detected at step 604 is stored to memory 404 when the event detected at step 604 is that a threshold has been exceeded.
- space in the memory 404 is conserved, by performing step 606 only if the current value of the parameter is different from a previous value of the parameter.
- step 606 is repeated a programmable number of times or for a programmable amount of time when the event detected at step 604 is that a threshold has been exceeded.
- step 608 it is determined if contents of the memory 404 should be transmitted to the base processor board 204 . The determination is made based on how much space is left in the memory 404 and/or how much time has passed since the last time the contents of the memory 404 were transmitted to the base processor board 204 . If it is determined, at step 608 , that the contents of the memory 404 should be transmitted to the base processor board computer 204 , then processing continues at step 610 . At step 610 , the transmitting is performed and the memory 404 is cleared out. Processing then continues at step 602 . Once the data is transmitted to the base processor board 204 , it is stored in the memory 304 on the base processor board 204 .
- the data can then be transmitted to a processor remote from the AACMM 100 and/or displayed on the color LCD 338 on the user interface board 202 .
- the thresholds and time intervals are programmed using the color LCD 338 on the user interface board 202 .
- additional monitoring is provided by the environmental recorder 362 when the AACMM 100 is powered on.
- the system monitors and records time stamped events such as, for example, error codes returned by software, missed communications, and supply voltage variations. Data from the environmental recorder 362 is then correlated with a software event monitoring system on the base processor board 204 to determine if hardware error conditions are related to environmental events.
- data from the environmental recorder 362 is used to create a history of the AACMM 100 from manufacture, through storage, shipment and use.
- This historical data can be used to diagnose issues reported by the user, which could include accuracy variations, electronic errors, and/or software anomalies.
- the historical data could be reviewed to see if the AACMM 100 was subjected to excessive shock just prior to the change in performance.
- a report of performance problems on a particular shift or date could be reviewed for extremes in temperature or vibrations at that time.
- the historical data can also be used to see if an AACMM 100 was abused during transport either to a customer site or in route back to the factory for service. AACMMs 100 showing similar performance symptoms can be checked for common environmental factors in the history log.
- Technical effects and benefits include the ability to more easily perform troubleshooting and determination of root cause of product failures, especially for events that occur during shipping, that occur outside of normal operating hours, or that go un-reported (e.g., dropping of the AACMM 100 ).
- aspects of the present invention may be embodied as a system, method, or computer program product. Accordingly, aspects of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, micro-code, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a “circuit,” “module” or “system.” Furthermore, aspects of the present invention may take the form of a computer program product embodied in one or more computer readable medium(s) having computer readable program code embodied thereon.
- the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
- a computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
- a computer readable storage medium may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
- a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof.
- a computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
- Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
- Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++, C# or the like and conventional procedural programming languages, such as the “C” programming language or similar programming languages.
- the program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server.
- the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).
- LAN local area network
- WAN wide area network
- Internet Service Provider for example, AT&T, MCI, Sprint, EarthLink, MSN, GTE, etc.
- These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
- These computer program instructions may also be stored in a computer readable medium that may direct a computer, other programmable data processing apparatus, or other devices to function in a particular manner, such that the instructions stored in the computer readable medium produce an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
- the computer program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
- each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s).
- the functions noted in the block may occur out of the order noted in the Figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
Abstract
A portable articulated arm coordinate measurement machine (AACMM) that includes a manually positionable articulated arm, a measurement device attached to a first end of the AACMM, and an electronic circuit for receiving the position signal and for providing data corresponding to a position of the measurement device. The AACMM further includes an environmental recorder. The environmental recorder includes a sensor for outputting a value of a parameter, a memory, and logic executable by the environmental recorder to implement a method. The method includes monitoring the value of the parameter, and determining that the value of the parameter is outside of a programmable threshold. The value of the parameter and a timestamp are stored in the memory in response to the value of the parameter being determined to be outside of the programmable threshold. The contents of the memory are transmitted to the electronic circuit.
Description
- The present application claims the benefit of provisional application No. 61/296,555 filed Jan. 20, 2010, the content of which is hereby incorporated by reference in its entirety.
- The present disclosure relates to a coordinate measuring machine, and more particularly to a portable articulated arm coordinate measuring machine having an integrated environmental recorder.
- Portable articulated arm coordinate measuring machines (AACMMs) have found widespread use in the manufacturing or production of parts where there is a need to rapidly and accurately verify the dimensions of the part during various stages of the manufacturing or production (e.g., machining) of the part. Portable AACMMs represent a vast improvement over known stationary or fixed, cost-intensive and relatively difficult to use measurement installations, particularly in the amount of time it takes to perform dimensional measurements of relatively complex parts. Typically, a user of a portable AACMM simply guides a probe along the surface of the part or object to be measured. The measurement data are then recorded and provided to the user. In some cases, the data are provided to the user in visual form, for example, three-dimensional (3-D) form on a computer screen. In other cases, the data are provided to the user in numeric form, for example when measuring the diameter of a hole, the text “Diameter=1.0034” is displayed on a computer screen.
- An example of a prior art portable articulated arm CMM is disclosed in commonly assigned U.S. Pat. No. 5,402,582 ('582), which is incorporated herein by reference in its entirety. The '582 patent discloses a 3-D measuring system comprised of a manually-operated articulated arm CMM having a support base on one end and a measurement probe at the other end. Commonly assigned U.S. Pat. No. 5,611,147 ('147), which is incorporated herein by reference in its entirety, discloses a similar articulated arm CMM. In the '147 patent, the articulated arm CMM includes a number of features including an additional rotational axis at the probe end, thereby providing for an arm with either a two-two-two or a two-two-three axis configuration (the latter case being a seven axis arm).
- Information about past environmental conditions of an articulated arm CMM is helpful during system diagnostics and repair of the articulated arm CMM. To enhance traceability of the past operating environments of the articulated arm CMM, what is needed is an environmental monitoring system to measure and record environmental data for the articulated arm CMM.
- An embodiment is a portable articulated arm coordinate measurement machine (AACMM) that includes a manually positionable articulated arm having opposed first and second ends, the arm including a plurality of connected arm segments, each of the arm segments including at least one position transducer for producing a position signal. The AACMM also includes a measurement device attached to a first end of the AACMM, and an electronic circuit for receiving the position signal from the transducers and for providing data corresponding to a position of the measurement device. The AACM further includes an environmental recorder in communication with the electronic circuit. The environmental recorder includes a sensor for outputting a value of a parameter, a memory, and logic executable by the environmental recorder to implement a method. The method includes monitoring the value of the parameter, and determining that the value of the parameter is outside of a programmable threshold. The value of the parameter and a timestamp are stored in the memory in response to the value of the parameter being determined to be outside of the programmable threshold. The contents of the memory are transmitted to the electronic circuit.
- Another embodiment is a method of implementing a portable AACMM. The method includes receiving a value of a parameter from a sensor located on the portable AACM. The portable AACMM includes a manually positionable articulated arm having opposed first and second ends. The arm includes a plurality of connected arm segments, each arm segment including at least one position transducer for producing a position signal. The portable AACMM also includes a measurement device attached to a first end of the portable AACMM, and an electronic circuit which receives the position signal from the transducers and provides data corresponding to a position of the measurement device. The received value of the parameter is monitored and it is determined that the value of the parameter is outside of a programmable threshold. The value of the parameter and a timestamp are stored in a memory located on an environmental recorder in response to the value of the parameter being determined to be outside of the programmable threshold. The contents of the memory are transmitted to the base computer processor.
- A further embodiment is a computer program product for implementing a portable AACMM. The computer program product includes a storage medium having computer-readable program code embodied thereon, which when executed by a computer causes the computer to implement a method. The method includes receiving a value of a parameter from a sensor located on the portable AACM. The portable AACMM includes a manually positionable articulated arm having opposed first and second ends. The arm includes a plurality of connected arm segments, each arm segment including at least one position transducer for producing a position signal. The portable AACMM also includes a measurement device attached to a first end of the portable AACMM, and an electronic circuit which receives the position signal from the transducers and provides data corresponding to a position of the measurement device. The received value of the parameter is monitored and it is determined that the value of the parameter is outside of a programmable threshold. The value of the parameter and a timestamp are stored in a memory located on an environmental recorder in response to the value of the parameter being determined to be outside of the programmable threshold. The contents of the memory are transmitted to the base computer processor.
- Referring now to the drawings, exemplary embodiments are shown which should not be construed to be limiting regarding the entire scope of the disclosure, and wherein the elements are numbered alike in several FIGURES:
-
FIG. 1 , includingFIGS. 1A and 1B , are perspective views of a portable articulated arm coordinate measuring machine (AACMM) having embodiments of various aspects of the present invention therewithin; -
FIG. 2 , includingFIGS. 2A-2D taken together, is a block diagram of electronics utilized as part of the AACMM ofFIG. 1 in accordance with an embodiment; -
FIG. 3 , includingFIGS. 3A and 3B taken together, is a block diagram describing detailed features of the electronic data processing system ofFIG. 2 in accordance with an embodiment; -
FIG. 4 is a block diagram describing detailed features of the environmental recorder ofFIG. 3 in accordance with an embodiment; -
FIG. 5 is a flow diagram describing a process performed by the environmental recorder when the AACMM is powered off in accordance with an embodiment; and -
FIG. 6 is a flow diagram describing a process performed by the environmental recorder when the AACMM is powered on in accordance with an embodiment. - A portable articulated arm coordinate measuring machine (AACMM) that includes an environmental recorder is provided in accordance with exemplary embodiments. The environmental recorder provides data that may be useful in explaining any anomalous behavior of the AACMM. Data representing the history of the AACMM is recorded by the environmental recorder at various times, including from early in the manufacturing process, during time in inventory, during shipment of the product, and during subsequent handling and use at the site of an end user. This data can be read directly by an end user of the AACMM via an on-board operating system and display, or it can be extracted and saved on another computer. The environmental recorder is an independent, battery backed environmental monitoring system that is located on the AACMM.
- Data collected by the environmental recorder may be utilized to alert a user about an event and to suggest that a probe calibration and/or a single point articulation performance test (SPAT) be performed to see if the arm is still measuring to specification. The data collected by the environmental recorder is also used during system diagnostics and repair to determine a history of the AACMM in terms of environmental conditions. Environmental conditions include, but are not limited to: temperature, humidity, and shock (e.g., due to the AACMM being dropped). Sensors located on the environmental recorder output values of environmental condition parameters and their values are recorded periodically. In accordance with embodiments, the periodic recording occurs both when the AACMM is powered on and when the AACMM is powered off. In addition, or alternatively, the values of environmental condition parameters are recorded in response to an event such as an extreme humidity value (e.g., as defined by a programmable threshold) being detected at a sensor. In accordance with embodiments, the recording of values that exceed thresholds occurs both when the AACMM is powered on and when the AACMM is powered off.
-
FIGS. 1A and 1B illustrate, in perspective, a portable articulated arm coordinate measuring machine (AACMM) 100 according to various embodiments of the present invention, an articulated arm being one type of coordinate measuring machine. As shown inFIGS. 1A and 1B , theexemplary AACMM 100 may comprise a six or seven axis articulated measurement device having ameasurement probe housing 102 coupled to anarm portion 104 of theAACMM 100 at one end. Thearm portion 104 comprises afirst arm segment 106 coupled to asecond arm segment 108 by a first grouping of bearing cartridges 110 (e.g., two bearing cartridges). A second grouping of bearing cartridges 112 (e.g., two bearing cartridges) couples thesecond arm segment 108 to themeasurement probe housing 102. A third grouping of bearing cartridges 114 (e.g., three bearing cartridges) couples thefirst arm segment 106 to a base 116 located at the other end of thearm portion 104 of theAACMM 100. Each grouping of bearingcartridges measurement probe housing 102 may comprise the shaft of the seventh axis portion of the AACMM 100 (e.g., a cartridge containing an encoder system that determines movement of the measurement device, for example aprobe 118, in the seventh axis of the AACMM 100). In use of theAACMM 100, thebase 116 is typically affixed to a work surface. - Each bearing cartridge within each bearing
cartridge grouping respective arm segments bearing cartridge groupings probe 118 with respect to the base 116 (and, thus, the position of the object being measured by theAACMM 100 in a certain frame of reference—for example a local or global frame of reference). Thearm segments portable AACMM 100 with six or seven axes of articulated movement (i.e., degrees of freedom) provides advantages in allowing the operator to position theprobe 118 in a desired location within a 360° area about thebase 116 while providing anarm portion 104 that may be easily handled by the operator. However, it should be appreciated that the illustration of anarm portion 104 having twoarm segments AACMM 100 may have any number of arm segments coupled together by bearing cartridges (and, thus, more or less than six or seven axes of articulated movement or degrees of freedom). - The
probe 118 is detachably mounted to themeasurement probe housing 102, which is connected to bearingcartridge grouping 112. Ahandle 126 is removable with respect to themeasurement probe housing 102 by way of, for example, a quick-connect interface. Thehandle 126 may be replaced with another device (e.g., a laser line probe, a bar code reader), thereby providing advantages in allowing the operator to use different measurement devices with thesame AACMM 100. In exemplary embodiments, theprobe housing 102 houses aremovable probe 118, which is a contacting measurement device and may havedifferent tips 118 that physically contact the object to be measured, including, but not limited to: ball, touch-sensitive, curved and extension type probes. In other embodiments, the measurement is performed, for example, by a non-contacting device such as a laser line probe (LLP). In an embodiment, thehandle 126 is replaced with the LLP using the quick-connect interface. Other types of measurement devices may replace theremovable handle 126 to provide additional functionality. Examples of such measurement devices include, but are not limited to, one or more illumination lights, a temperature sensor, a thermal scanner, a bar code scanner, a projector, a paint sprayer, a camera, or the like, for example. - As shown in
FIGS. 1A and 1B , theAACMM 100 includes theremovable handle 126 that provides advantages in allowing accessories or functionality to be changed without removing themeasurement probe housing 102 from the bearingcartridge grouping 112. As discussed in more detail below with respect toFIG. 2 , theremovable handle 126 may also include an electrical connector that allows electrical power and data to be exchanged with thehandle 126 and the corresponding electronics located in the probe end. - In various embodiments, each grouping of bearing
cartridges arm portion 104 of theAACMM 100 to move about multiple axes of rotation. As mentioned, each bearingcartridge grouping arm segments arm segments AACMM 100 as described in more detail herein below. Each individual raw encoder count is sent separately to the electronic data processing system as a signal where it is further processed into measurement data. No position calculator separate from theAACMM 100 itself (e.g., a serial box) is required, as disclosed in commonly assigned U.S. Pat. No. 5,402,582 ('582). - The base 116 may include an attachment device or mounting
device 120. The mountingdevice 120 allows theAACMM 100 to be removably mounted to a desired location, such as an inspection table, a machining center, a wall or the floor for example. In one embodiment, thebase 116 includes ahandle portion 122 that provides a convenient location for the operator to hold the base 116 as theAACMM 100 is being moved. In one embodiment, the base 116 further includes amovable cover portion 124 that folds down to reveal a user interface, such as a display screen. - In accordance with an embodiment, the
base 116 of theportable AACMM 100 contains or houses an electronic data processing system that includes two primary components: a base processing system that processes the data from the various encoder systems within theAACMM 100 as well as data representing other arm parameters to support three-dimensional (3-D) positional calculations; and a user interface processing system that includes an on-board operating system, a touch screen display, and resident application software that allows for relatively complete metrology functions to be implemented within theAACMM 100 without the need for connection to an external computer. - The electronic data processing system in the
base 116 may communicate with the encoder systems, sensors, and other peripheral hardware located away from the base 116 (e.g., a LLP that can be mounted to theremovable handle 126 on the AACMM 100). The electronics that support these peripheral hardware devices or features may be located in each of the bearingcartridge groupings portable AACMM 100. -
FIG. 2 is a block diagram of electronics utilized in anAACMM 100 in accordance with an embodiment. The embodiment shown inFIG. 2 includes an electronicdata processing system 210 including abase processor board 204 for implementing the base processing system, auser interface board 202, abase power board 206 for providing power, aBluetooth module 232, and abase tilt board 208. Theuser interface board 202 includes a computer processor for executing application software to perform user interface, display, and other functions described herein. - As shown in
FIG. 2 , the electronicdata processing system 210 is in communication with the aforementioned plurality of encoder systems via one ormore arm buses 218. In the embodiment depicted inFIG. 2 , each encoder system generates encoder data and includes: an encoderarm bus interface 214, an encoder digital signal processor (DSP) 216, an encoder readhead interface 234, and atemperature sensor 212. Other devices, such as strain sensors, may be attached to thearm bus 218. - Also shown in
FIG. 2 areprobe end electronics 230 that are in communication with thearm bus 218. Theprobe end electronics 230 include aprobe end DSP 228, atemperature sensor 212, a handle/LLP interface bus 240 that connects with thehandle 126 or theLLP 242 via the quick-connect interface in an embodiment, and aprobe interface 226. The quick-connect interface allows access by thehandle 126 to the data bus, control lines, and power bus used by theLLP 242 and other accessories. In an embodiment, theprobe end electronics 230 are located in themeasurement probe housing 102 on theAACMM 100. In an embodiment, thehandle 126 may be removed from the quick-connect interface and measurement may be performed by the laser line probe (LLP) 242 communicating with theprobe end electronics 230 of theAACMM 100 via the handle/LLP interface bus 240. In an embodiment, the electronicdata processing system 210 is located in thebase 116 of theAACMM 100, theprobe end electronics 230 are located in themeasurement probe housing 102 of theAACMM 100, and the encoder systems are located in the bearingcartridge groupings probe interface 226 may connect with theprobe end DSP 228 by any suitable communications protocol, including commercially-available products from Maxim Integrated Products, Inc. that embody the 1-wire® communications protocol 236. -
FIG. 3 is a block diagram describing detailed features of the electronicdata processing system 210 of theAACMM 100 in accordance with an embodiment. In an embodiment, the electronicdata processing system 210 is located in thebase 116 of theAACMM 100 and includes thebase processor board 204, theuser interface board 202, abase power board 206, aBluetooth module 232, and abase tilt module 208. - In an embodiment shown in
FIG. 3 , thebase processor board 204 includes the various functional blocks illustrated therein. For example, abase processor function 302 is utilized to support the collection of measurement data from theAACMM 100 and receives raw arm data (e.g., encoder system data) via thearm bus 218 and a buscontrol module function 308. Thememory function 304 stores programs and static arm configuration data. Thebase processor board 204 also includes an external hardwareoption port function 310 for communicating with any external hardware devices or accessories such as anLLP 242. A real time clock (RTC) and log 306, a battery pack interface (IF) 316, and adiagnostic port 318 are also included in the functionality in an embodiment of thebase processor board 204 depicted inFIG. 3 . - The
base processor board 204 also manages all the wired and wireless data communication with external (host computer) and internal (display processor 202) devices. Thebase processor board 204 has the capability of communicating with an Ethernet network via an Ethernet function 320 (e.g., using a clock synchronization standard such as Institute of Electrical and Electronics Engineers (IEEE) 1588), with a wireless local area network (WLAN) via aLAN function 322, and withBluetooth module 232 via a parallel to serial communications (PSC)function 314. Thebase processor board 204 also includes a connection to a universal serial bus (USB) device 312. - The
base processor board 204 transmits and collects raw measurement data (e.g., encoder system counts, temperature readings) for processing into measurement data without the need for any preprocessing, such as disclosed in the serial box of the aforementioned '582 patent. Thebase processor 204 sends the processed data to thedisplay processor 328 on theuser interface board 202 via an RS485 interface (IF) 326. In an embodiment, thebase processor 204 also sends the raw measurement data to an external computer. - Turning now to the
user interface board 202 inFIG. 3 , the angle and positional data received by the base processor is utilized by applications executing on thedisplay processor 328 to provide an autonomous metrology system within theAACMM 100. Applications may be executed on thedisplay processor 328 to support functions such as, but not limited to: measurement of features, guidance and training graphics, remote diagnostics, temperature corrections, control of various operational features, connection to various networks, and display of measured objects. Along with thedisplay processor 328 and a liquid crystal display (LCD) 338 (e.g., a touch screen LCD) user interface, theuser interface board 202 includes several interface options including a secure digital (SD)card interface 330, amemory 332, a USB Host interface 334, a diagnostic port 336, acamera port 340, an audio/video interface 342, a dial-up/cell modem 344 and a global positioning system (GPS)port 346. - The electronic
data processing system 210 shown inFIG. 3 also includes abase power board 206 with anenvironmental recorder 362 for recording environmental data. Thebase power board 206 also provides power to the electronicdata processing system 210 using an AC/DC converter 358 and abattery charger control 360. Thebase power board 206 communicates with thebase processor board 204 using inter-integrated circuit (I2C) serial single endedbus 354 as well as via a DMA serial peripheral interface (DSPI) 356. Thebase power board 206 is connected to a tilt sensor and radio frequency identification (RFID)module 208 via an input/output (I/O)expansion function 364 implemented in thebase power board 206. - Though shown as separate components, in other embodiments all or a subset of the components may be physically located in different locations and/or functions combined in different manners than that shown in
FIG. 3 . For example, in one embodiment, thebase processor board 204 and theuser interface board 202 are combined into one physical board. - In an embodiment, the
AACMM 100 includes the integrated electronicdata processing system 210 described above. The electronicdata processing system 210 resides onboard, and is integrated with, theAACMM 100 and its components. Thebase processor board 204 includes a base computer processor, which may be implemented by theprocessor function 302 illustrated inFIG. 3 . The base computer processor performs user-selected functions in response to requests received via theAACMM 100, which functions are described further herein. In an exemplary embodiment, the functions are performed via one or more applications (e.g., logic) executed by the base computer processor and stored, e.g., inmemory 304 ofFIG. 3 . In an embodiment the requests may be received at theAACMM 100 via the onboarduser interface board 202 illustrated inFIG. 2 and/or an external computer processor that is remotely located from theAACMM 100 and communicates with theAACMM 100 either directly through a USB channel, over an Ethernet network, or wirelessly, e.g., over a wireless LAN or Bluetooth™-enabledchannel 232, as illustrated generally inFIG. 2 . In response to the requests, various components, e.g.,encoders 214/216/234,probe end electronics 230, and/or peripheral devices (e.g., LLP 242) are activated and collect data responsive to the requests. Information derived by the data is returned to the base computer processor, and forwarded to a destination device as described further herein. - Referring to
FIG. 4 , a more detailed view of theenvironmental recorder 362 ofFIG. 3 is generally shown. Theenvironmental recorder 362 includes abattery 410 for providing electrical power to components of theenvironmental recorder 362 for an extended period of time (e.g., five to six months) without the need for external power. Thebattery 410 may be implemented using any battery sized to fit on theenvironmental recorder 362 and capable of holding a charge for an extended period of time. Thebattery 410 is charged when theAACMM 100 is connected to external power for operation or if present, from a secondary (re-chargeable) AACMM battery pack, whether connected to external power or not. Having adedicated battery 410 in theenvironmental recorder 362 allows theenvironmental recorder 362 to operate when theAACMM 100 is powered off (e.g., in a power off state). - The
environmental recorder 362 also includes aclock 406 for maintaining the date and time of day. Theclock 406 is used to generate a timestamp for events that are logged as well as to measure time intervals. Commercially available clocks such as, but not limited to, a crystal driven clock may be utilized by embodiments. - The
environmental recorder 362 depicted inFIG. 4 includes various sensors: animpact sensor 402, ahumidity sensor 414, and atemperature sensor 412. These sensors are examples of the types of sensors that may be utilized by theenvironmental recorder 362 and are not intended to be limiting as other types of sensors (e.g., vibration sensors, atmospheric pressure sensors, etc.) may also be implemented. - An embodiment of the
impact sensor 402 is implemented by two or more accelerometers: a first accelerometer designed to detect and measure very small accelerations (or vibrations); and a second accelerometer designed to detect and measure larger accelerations. When the first accelerometer detects a motion, it instructs the second accelerometer to start taking and recording measurements. As known in the art, accelerometers measure acceleration in terms of gravitational force (g-force), and thus, theimpact sensor 402 measures a g-force parameter. Any suitable accelerometers known in the art for detecting a shock or impact may be utilized by exemplary embodiments described herein, including, but not limited to three-axis micro electro-mechanical systems (MEMS), gravitometers, piezoresistive accelerometers, and capacitive accelerometers. In an embodiment, a g-force value detected by the first accelerometer that is greater than a present threshold (e.g., 2.5 g), causes theenvironmental recorder 362 to store the values of the g-force along with a timestamp. This programmable g-force threshold value may be updated during manufacturing or initialization of theAACMM 100. - The parameter measured by the
temperature sensor 412 is ambient temperature, and thetemperature sensor 412 is implemented by a commercially available temperature sensor. In an embodiment, a temperature value that is greater than 45 degrees Celsius or less than 5 degrees Celsius causes theenvironmental recorder 362 to store the value of the temperature along with a timestamp. This programmable temperature threshold value may be updated during manufacturing or initialization of theAACMM 100. - A humidity parameter is measured by the
humidity sensor 414, and thehumidity sensor 414 is implemented by a commercially available humidity sensor. In an embodiment, a humidity value that is greater than 80% or less than 20% causes theenvironmental recorder 362 to store the value of the humidity along with a timestamp. This programmable humidity threshold value may be updated during manufacturing or initialization of theAACMM 100. - The
processor 408 controls a programmable time interval for recording values of the parameters from the sensors, the reading of sensors, and the recording or storage of the values and timestamps into thememory 404. As described herein, the values of parameters measured by the sensors cause theenvironmental recorder 362 to activate the recording of the parameter value at the moment of an event (or shortly thereafter) regardless of the monitoring schedule of that sensor. An alert may also be sent to an operator of the system (e.g., via the LCD 338) in response to the event being detected. In addition, theprocessor 408 controls the periodic transmission of contents of thememory 404 to thebase processor board 204. In an embodiment, the transmission is across an inter-integrated circuit (I2C) bus, and the processor is implemented by a commercially available processor. Theprocessor 408 controls the processing described herein using hardware instructions, software instructions or a combination of both. - The
memory 404 stores the recorded values of the parameters and their associated timestamps. In addition, thememory 404 may store the programmable threshold values associated with the parameters. Thememory 404 is implemented by a commercially available memory such as, but not limited to: flash and direct random access memory (SRAM). The size of thememory 404 dictates how many parameter values and timestamps may be stored at theenvironmental recorder 362 before requiring a transmission of contents of thememory 404 to thebase processor board 204. -
FIG. 4 shows theimpact sensor 402,memory 404,clock 406,processor 408,battery 410,temperature sensor 412, andhumidity sensor 414 located on theenvironmental recorder 362. In alternate embodiments, all or a subset of these elements are located outside of theenvironmental recorder 362 on theAACMM 100 with communication between the elements being provided via a network or bus. - In an embodiment, the
environmental recorder 362 utilizes multiple processors, clocks, and sensors. The lowest level system runs continuously and detects basis events that then bring up the next processor and sensor set. When theAACMM 100 is powered up, a third processor comes into play to interface to theenvironmental recorder 362, and then a fourth processor comes up to allow retrieval and display of data. - Referring to
FIG. 5 , a flow diagram describing a process performed by theenvironmental recorder 362 when the AACMM is in a low power mode (e.g., powered off, reduced power) is generally shown. In an embodiment, the processing is facilitated by computer instructions, or logic, located in theprocessor 408. Atstep 502, the values of parameters output by the sensors located on theenvironmental recorder 362, such asimpact sensor 402 and/ortemperature sensor 412 are monitored. Atstep 504, it is determined if an event has been detected by the monitoring. An event occurs when the value of at least one of the parameters is outside of a programmable threshold. An event also occurs when a programmable time interval has expired. If an event has not been detected, as determined atstep 504, then processing continues atstep 502. Otherwise, if an event has been detected, then processing continues at step 506. - In an embodiment, while the monitoring and detecting are being performed, the
environmental recorder 362 is in a low power mode where thememory 404 is not accessible. At step 506, theenvironmental recorder 362 is put into a high power mode to allow access to thememory 404. The values of the parameter(s) along with a timestamp are stored to thememory 404 atstep 508. In an embodiment, values of all of the parameters being measured by the sensors are stored to thememory 404 atstep 508. Alternatively, all of the parameter values are stored tomemory 404 when the event detected atstep 504 is that a programmable time interval has expired, and only the value of the parameter causing the event to be detected atstep 504 is stored tomemory 404 when the event detected atstep 504 is that a threshold has been exceeded. In an embodiment,step 508 is repeated a programmable number of times or for a programmable amount of time when the event detected atstep 504 is that a threshold has been exceeded. In an embodiment, space in thememory 404 is conserved, by performingstep 508 only if the current value of the parameter is different from a previous value of the parameter. Atstep 510, theenvironmental recorder 362 is put into the low power mode. In an embodiment, the low power mode includes portions of theenvironmental recorder 362 that are not used for the monitoring and detecting being powered off. Processing then continues atstep 502. - Referring to
FIG. 6 , a flow diagram describing a process performed by theenvironmental recorder 362 when the AACMM is powered on is generally shown. In an embodiment, the processing is facilitated by computer instructions, or logic, located in theprocessor 408. Atstep 602, the values of parameters output by the sensors located on theenvironmental recorder 362, such asimpact sensor 402 and/ortemperature sensor 412 are monitored. Atstep 604, it is determined if an event has been detected by the monitoring. An event occurs when the value of at least one of the parameters is outside of a programmable threshold. An event also occurs when a programmable time interval has expired. If it is determined atstep 604, that an event has not been detected, then processing continues atstep 608. Alternatively, it if is determined that an event has been detected, then processing continues atstep 608. - The values of the parameter(s) along with a timestamp are stored to the
memory 404 atstep 606. In an embodiment, values of all of the parameters being measured by the sensors are stored to thememory 404 atstep 606. Alternatively, all of the parameter values are stored tomemory 404 when the event detected atstep 604 is that a programmable time interval has expired, and only the value of the parameter causing the event to be detected atstep 604 is stored tomemory 404 when the event detected atstep 604 is that a threshold has been exceeded. In an embodiment, space in thememory 404 is conserved, by performingstep 606 only if the current value of the parameter is different from a previous value of the parameter. In an embodiment,step 606 is repeated a programmable number of times or for a programmable amount of time when the event detected atstep 604 is that a threshold has been exceeded. - At
step 608, it is determined if contents of thememory 404 should be transmitted to thebase processor board 204. The determination is made based on how much space is left in thememory 404 and/or how much time has passed since the last time the contents of thememory 404 were transmitted to thebase processor board 204. If it is determined, atstep 608, that the contents of thememory 404 should be transmitted to the baseprocessor board computer 204, then processing continues atstep 610. Atstep 610, the transmitting is performed and thememory 404 is cleared out. Processing then continues atstep 602. Once the data is transmitted to thebase processor board 204, it is stored in thememory 304 on thebase processor board 204. The data can then be transmitted to a processor remote from theAACMM 100 and/or displayed on thecolor LCD 338 on theuser interface board 202. In additional embodiments, the thresholds and time intervals are programmed using thecolor LCD 338 on theuser interface board 202. - In an embodiment, additional monitoring is provided by the
environmental recorder 362 when theAACMM 100 is powered on. The system monitors and records time stamped events such as, for example, error codes returned by software, missed communications, and supply voltage variations. Data from theenvironmental recorder 362 is then correlated with a software event monitoring system on thebase processor board 204 to determine if hardware error conditions are related to environmental events. - In an embodiment, data from the
environmental recorder 362 is used to create a history of theAACMM 100 from manufacture, through storage, shipment and use. This historical data can be used to diagnose issues reported by the user, which could include accuracy variations, electronic errors, and/or software anomalies. As an example, if a customer reported that theAACMM 100 suddenly stopped providing accurate readings, the historical data could be reviewed to see if theAACMM 100 was subjected to excessive shock just prior to the change in performance. A report of performance problems on a particular shift or date could be reviewed for extremes in temperature or vibrations at that time. The historical data can also be used to see if anAACMM 100 was abused during transport either to a customer site or in route back to the factory for service.AACMMs 100 showing similar performance symptoms can be checked for common environmental factors in the history log. - Technical effects and benefits include the ability to more easily perform troubleshooting and determination of root cause of product failures, especially for events that occur during shipping, that occur outside of normal operating hours, or that go un-reported (e.g., dropping of the AACMM 100).
- As will be appreciated by one skilled in the art, aspects of the present invention may be embodied as a system, method, or computer program product. Accordingly, aspects of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, micro-code, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a “circuit,” “module” or “system.” Furthermore, aspects of the present invention may take the form of a computer program product embodied in one or more computer readable medium(s) having computer readable program code embodied thereon.
- Any combination of one or more computer readable medium(s) may be utilized. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
- A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
- Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
- Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++, C# or the like and conventional procedural programming languages, such as the “C” programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).
- Aspects of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, may be implemented by computer program instructions.
- These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer program instructions may also be stored in a computer readable medium that may direct a computer, other programmable data processing apparatus, or other devices to function in a particular manner, such that the instructions stored in the computer readable medium produce an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
- The computer program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
- The flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the Figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, may be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
- While the invention has been described with reference to example embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims. Moreover, the use of the terms first, second, etc. do not denote any order or importance, but rather the terms first, second, etc. are used to distinguish one element from another. Furthermore, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.
Claims (24)
1. A portable articulated arm coordinate measurement machine (AACMM), comprising:
a manually positionable articulated arm having opposed first and second ends, the arm including a plurality of connected arm segments, each of the arm segments including at least one position transducer for producing a position signal;
a measurement device attached to a first end of the AACMM;
an electronic circuit for receiving the position signal from the at least one transducer and for providing data corresponding to a position of the measurement device; and
an environmental recorder in communication with the electronic circuit, the environmental recorder including
a sensor for outputting a value of a parameter;
a memory; and
logic executable by the environmental recorder to implement a method that comprises
monitoring the value of the parameter;
determining that the value of the parameter is outside of a programmable threshold;
storing the value of the parameter and a timestamp in the memory, the storing responsive to the determining; and
transmitting contents of the memory to the electronic circuit.
2. The system of claim 1 , wherein the environmental recorder further comprises a battery, and the monitoring, determining, and storing are performed using power from the battery when the portable AACMM is in a power off state.
3. The system of claim 1 , wherein the method further comprises storing the value of the parameter and the time stamp in the memory at least once during a programmable time interval.
4. The system of claim 1 , wherein the transmitting is performed when the portable AACMM is powered on in response to at least one of the memory reaching a programmable capacity and a programmable amount of time passing since the last time that the contents were transmitted to the electronic circuit.
5. The system of claim 1 , wherein the storing is further responsive to the value of the parameter being different than a previous value of the parameter.
6. The system of claim 1 , wherein the sensor comprises a shock sensor and the parameter is acceleration.
7. The system of claim 1 , wherein the sensor comprises at least one of a temperature sensor and a humidity sensor.
8. A method of implementing a portable articulated arm coordinate measuring machine (AACMM), the method comprising:
receiving a value of a parameter from a sensor located on the portable AACMM, the portable AACMM comprised of a manually positionable articulated arm portion having opposed first and second ends, the arm portion including a plurality of connected arm segments, each arm segment including at least one position transducer for producing a position signal, a measurement device attached to the first end, and an electronic circuit which receives the position signal from the at least one transducer and provides data corresponding to a position of the measurement device;
monitoring the value of the parameter;
determining that the value of the parameter is outside of a programmable threshold;
storing the value of the parameter and a timestamp in a memory located on an environmental recorder, the storing responsive to detecting the event; and
transmitting contents of the memory to the electronic circuit.
9. The method of claim 8 , wherein the monitoring, determining, and storing are performed using power from a battery connected to the environmental recorder when the portable articulated arm coordinate measuring machine is in a power off state.
10. The method of claim 8 , further comprising storing the value of the parameter and the time stamp in the memory at least once during a programmable time interval.
11. The method of claim 8 , wherein the transmitting is performed when the portable AACMM is powered on in response to at least one of the memory reaching a programmable capacity and a programmable amount of time passing since the last time that the contents were transmitted to the electronic circuit.
12. The method of claim 8 , wherein the storing is further responsive to the value of the parameter being different than a previous value of the parameter.
13. The method of claim 8 , wherein the sensor comprises a shock sensor and the parameter is acceleration.
14. The method of claim 8 , wherein the sensor comprises at least one of a temperature sensor and a humidity sensor.
15. The method of claim 8 , further comprising initiating an alert to the electronic circuit in response to detecting the event.
16. The method of claim 8 , further comprising generating a report responsive to the contents of the memory.
17. The method of claim 16 , wherein the report is utilized to diagnose at least one of accuracy variations, electronic errors, and software anomalies.
18. A computer program product for implementing a portable articulated arm coordinate measuring machine (AACMM), the computer program product comprising a storage medium having computer-readable program code embodied thereon, which when executed by a computer causes the computer to implement a method, the method including:
receiving a value of a parameter from a sensor located on the portable AACMM, the portable AACMM comprised of a manually positionable articulated arm portion having opposed first and second ends, the arm portion including a plurality of connected arm segments, each arm segment including at least one position transducer for producing a position signal, a measurement device attached to a first end of the portable AACMM, and an electronic circuit which receives the position signal from the at least one transducer and provides data corresponding to a position of the measurement device;
monitoring the value of the parameter;
determining that the value of the parameter is outside of a programmable threshold;
storing the value of the parameter and a timestamp in a memory located on an environmental recorder, the storing responsive to detecting the event; and
transmitting contents of the memory to the electronic circuit.
19. The computer program product of claim 18 , wherein the monitoring, determining, and storing are performed using power from a battery located on the environmental recorder when the portable AACMM is in a power off state.
20. The computer program product of claim 18 , wherein the method further comprises storing the value of the parameter and the timestamp in the memory at least once during a programmable time interval.
21. The computer program product of claim 18 , wherein the transmitting is performed when the portable AACMM is powered on in response to at least one of the memory reaching a programmable capacity and a programmable amount of time passing since the last time that the contents were transmitted to the electronic circuit.
22. The computer program product of claim 18 , wherein the storing is further responsive to the value of the parameter being different than a previous value of the parameter.
23. The computer program product of claim 18 , wherein the sensor comprises at least one of a shock sensor, a temperature sensor, and a humidity sensor.
24. The computer program product of claim 18 , wherein the method further includes initiating an alert to the electronic circuit in response to detecting the event.
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US13/006,564 Active 2033-11-29 US8942940B2 (en) | 2010-01-20 | 2011-01-14 | Portable articulated arm coordinate measuring machine and integrated electronic data processing system |
US13/006,524 Abandoned US20110178765A1 (en) | 2010-01-20 | 2011-01-14 | Multi-functional coordinate measurement machines |
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US13/006,503 Active 2031-02-27 US8276286B2 (en) | 2010-01-20 | 2011-01-14 | Display for coordinate measuring machine |
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US13/006,500 Active US8001697B2 (en) | 2010-01-20 | 2011-01-14 | Counter balance for coordinate measurement device |
US13/006,461 Abandoned US20110175745A1 (en) | 2010-01-20 | 2011-01-14 | Embedded arm strain sensors |
US13/006,458 Abandoned US20110178763A1 (en) | 2010-01-20 | 2011-01-14 | Use of inclinometers to improve relocation of a portable articulated arm coordinate measuring machine |
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US13/006,484 Abandoned US20110178754A1 (en) | 2010-01-20 | 2011-01-14 | Portable Articulated Arm Coordinate Measuring Machine Having Integrated Software Controls |
US13/009,965 Active US8171650B2 (en) | 2010-01-20 | 2011-01-20 | Intelligent repeatable arm mounting system |
US13/628,448 Active US8601702B2 (en) | 2010-01-20 | 2012-09-27 | Display for coordinate measuring machine |
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