US20090040535A1 - Reflective corner cube array - Google Patents
Reflective corner cube array Download PDFInfo
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- US20090040535A1 US20090040535A1 US12/101,394 US10139408A US2009040535A1 US 20090040535 A1 US20090040535 A1 US 20090040535A1 US 10139408 A US10139408 A US 10139408A US 2009040535 A1 US2009040535 A1 US 2009040535A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/12—Reflex reflectors
- G02B5/122—Reflex reflectors cube corner, trihedral or triple reflector type
- G02B5/124—Reflex reflectors cube corner, trihedral or triple reflector type plural reflecting elements forming part of a unitary plate or sheet
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S359/00—Optical: systems and elements
- Y10S359/90—Methods
Definitions
- the present invention relates to vibration detection devices and in particular to devices that measure vibration in select directions.
- a LDV measures the vibration of an object without contact. Basically, a LDV works by reflecting a laser signal off of a surface of an object. The LDG then compares the frequency of the reflected signal with the original signal. A change in frequency (Doppler shift) indicates vibration (or movement) of the object. Moreover, the measured change in frequency is used to calculate the vibration of the object.
- Doppler shift indicates vibration (or movement) of the object.
- LDV devices work in many applications their use has some limitations. For example, it is difficult to align light sensors of the LDV to receive the reflected laser light. Moreover, it is difficult with current LDV designs to obtain vibration measurements in multiple dimensions or multiple directions.
- a corner reflective array in one embodiment, includes at least one corner cube.
- Each corner cube includes three mutually perpendicular reflective surfaces that intersect in a corner.
- corner reflective array includes one or more corner arrays.
- Each corner array includes a first, second and third reflective surface.
- the first reflective surface is positioned in a plane along a first axes.
- the second reflective surface positioned in a plane along a second axes and the third reflective surface positioned in a plane along a third axes.
- a vibration test system in still another embodiment, includes one or more motion sensing devices and at least one corner cube.
- the one or more motion sensing devices are adapted to reflect laser signals off of a reflective surface and determine motion via the reflected laser signals.
- Each corner cube includes three mutually perpendicular reflective surfaces that intersect in a corner. Each reflective surface is adapted to reflect the laser signals from the one or more motion sensing devices.
- the at least one corner cube is adapted to be coupled to an object under test.
- a method of testing vibrations in an object comprises attaching at least one corner cube to the object.
- Each corner cube includes three mutually perpendicular reflective surfaces that intersect in a corner. Reflecting at least one laser signal off of at least one of the reflective surfaces of a corner cube and determining the motion of the object in the direction of the at least one reflected laser signal.
- a method of determining the vibration of an object comprises attaching a corner reflective array having at least one corner cube to an object to be tested.
- Each corner array including a first, second and third reflective surface.
- the first reflective surface positioned in a plane along a first axes.
- the second reflective surface positioned in a plane along a second axes.
- the third reflective surface positioned in a plane along a third axes, wherein the first, second and third axes are mutually perpendicular to each other. Reflecting a first laser signal off of a corner cube and determining the motion of the object in the direction of the first laser signal based on the reflected first laser signal.
- a method of determining vibration of an object in three dimensions comprises directing one or more sets of laser signals at one or more corner cubes of a corner cube array attached to the object.
- Each set of laser signals includes non-coplanar first, second and third laser signals.
- the method further includes determining the vibration of the object in three dimensions based on at least one set of laser signals reflected off of the one or more corner cubes of the corner cube array.
- a motion detection device in further another embodiment, includes a corner cube array means adapted to reflect laser beams back in the direction they were received from and a means to determine the motion in the direction of the reflected laser beam.
- FIG. 1A is an isometric view of a reflective device of one embodiment of the present invention.
- FIG. 1B is a top view of the reflective device of FIG. 1A :
- FIG. 1C is an isometric view of a reflective device of FIG. 1A attached to an object under test;
- FIG. 2A is an isometric view of another embodiment of a reflective device of the present invention.
- FIG. 2B is a top view of the reflective device of FIG. 2A ;
- FIG. 2C is an isometric view of the reflective device of FIG. 2A attached to an object under test;
- FIG. 3 is an isometric view of another embodiment of a reflective device of the present invention attached to an object under test;
- FIG. 4 is a isometric view of another embodiment of a reflective device of the present invention attached to an object under test;
- FIG. 5 is a isometric view of yet another embodiment of a reflective device of the present invention attached to an object under test;
- FIG. 6 is a isometric view of still another embodiment of a reflective device of the present invention attached to an object under test;
- FIG. 7 is a isometric view of a reflective device of FIG. 5 attached to an object under test with a LVD system applied;
- FIG. 8 is a flow diagram of one embodiment of the present invention.
- FIG. 9 is a flow diagram of yet another embodiment of the present invention.
- Embodiments of the present invention provide corner reflective arrays having tri-corner cubes that allow a LDV, or similar device, to measure vibration information of an object in different directions.
- each tri-corner cube (or corner cube) includes three mutually perpendicular panels with reflective surfaces. The three panels in each corner cube intersect at a corner. The reflective surfaces may be mirrored or made from a reflective metal in some other way.
- embodiments of the present invention allow for a LDV system, or similar system, to obtain vibration measurements in multiple directions at a single location.
- FIG. 1A an isometric view of a bi-corner reflective array 100 (or bi-corner array 100 ) of one embodiment of the present invention is disclosed.
- this embodiment includes panels 108 , 110 and 112 .
- Each panel 108 , 110 and 112 is positioned so that each panel 108 , 110 and 112 is mutually perpendicular to the other panels.
- the panels are positioned to form two corner cubes 101 and 103 .
- Embodiments of the present invention include one or more corner cubes. Reflective surfaces are attached to the panels 108 , 110 and 112 to form the reflective array 100 .
- reflective surfaces 102 - 1 through 102 - 3 are attached to each of the panels 108 , 110 and 112 to form reflective corner cube 101 and reflective surfaces 104 - 1 through 104 - 3 are coupled to respective panels 108 , 110 and 112 to form reflective corner cube 103 .
- the reflective surfaces of each corner cube meet at a corner.
- corner cube 101 the reflective surfaces 102 - 1 through 102 - 3 meet at corner 106 .
- the reflective surfaces 104 - 1 through 104 - 3 meet at corner 108 .
- each corner cube 101 and 103 has three reflective surfaces that are mutually perpendicular to each other, vibration information in three axes can be determined by reflecting laser beams off the each of the reflective panels and measuring the doppler shift.
- three lasers or a single laser in combination with a beam splitter
- bi-corner array 100 two reflective surfaces per axes can be used.
- the bi-corner array gives the option of two different reflective surfaces to reflect a laser signal off of rather than a single reflective surface a single corner cube would provide. Accordingly, this allows for greater options in setting up a laser and receiver. For example, referring to FIG. 1C , to determine the vibration in an axis along panel 110 , a laser signal can be reflected off of reflective surface 102 - 3 or reflective surface 104 - 3 .
- FIGS. 1A through 1B illustrate the panels forming corner cubes having reflective surfaces that are square or rectangular in shape
- FIG. 2A illustrates a bi-corner reflective array 200 of one embodiment of the present invention using triangle shaped reflective surfaces 201 - 1 through 201 - 3 and 204 - 1 through 204 - 3 .
- the panels 208 , 210 and 212 upon which the reflective surfaces 201 - 1 through 201 - 3 and 204 - 1 through 204 - 3 are attached are mutually perpendicular to each other.
- FIG. 1 illustrates the panels forming corner cubes having reflective surfaces that are square or rectangular in shape
- FIG. 2A illustrates a bi-corner reflective array 200 of one embodiment of the present invention using triangle shaped reflective surfaces 201 - 1 through 201 - 3 and 204 - 1 through 204 - 3 .
- FIG. 3 further illustrates a quad-corner reflective array 300 of another embodiment of the present invention.
- This embodiment has four corner cubes 301 , 303 , 305 and 307 .
- the corner cubes 301 , 303 , 305 and 307 are formed by mutually perpendicular panels 308 , 310 and 312 .
- corner cube 301 is formed by reflective surfaces 302 - 1 through 302 - 3 of respective panels 308 , 310 and 312 as illustrated.
- the reflective surfaces 302 - 1 through 302 - 3 form corner 306 .
- Corner cube 303 is formed by reflective surfaces 304 - 1 through 304 - 3 of respective panels 308 , 310 and 312 as illustrated.
- corner cube 305 is formed by reflective surfaces 314 - 1 through 314 - 3 of respective panels 308 , 310 and 312 as illustrated.
- corner cube 307 is formed by reflective surfaces 316 - 1 through 316 - 3 of panels 308 , 310 and 312 as illustrated.
- the panels 308 , 310 and 112 are double sided mirrors wherein the mirrors make up the reflective surfaces.
- the reflective surfaces are coupled or attached to the panels 308 , 310 and 112 .
- the quad-corner reflective array 300 is attached to a surface 322 of an object 320 under test.
- FIG. 4 illustrates another quad-corner reflective array 400 of another embodiment of the present invention.
- the reflective surfaces are in a shape of a triangle.
- This embodiment has four corner cubes 401 , 403 , 405 and 407 .
- the corner cubes 401 , 403 , 405 and 407 are formed by mutually perpendicular panels 408 , 410 and 412 .
- corner cube 401 is formed by reflective surfaces 402 - 1 through 402 - 3 of respective panels 408 , 410 and 412 as illustrated.
- the reflective surfaces 402 - 1 through 402 - 3 form corner 406 .
- Corner cube 403 is formed by reflective surfaces 404 - 1 through 404 - 3 of respective panels 408 , 410 and 412 as illustrated.
- corner cube 405 is formed by reflective surfaces 414 - 1 through 414 - 3 of respective panels 408 , 410 and 412 as illustrated.
- corner cube 407 is formed by three reflective surfaces of panels 408 , 410 and 412 .
- the quad-corner reflective array 400 is attached to a surface 422 of an object 420 under test.
- an octet-corner reflective array 500 of another embodiment of the present invention is illustrated.
- eight corner cubes are formed from panels 508 , 510 and 512 .
- the eight corner cubes include corner cubes 501 , 503 , 505 , 507 , 59 , 511 and 513 .
- One of the corner cubes of the octet-corner reflective array 500 cannot be seen in the perspective view of FIG. 5 .
- corner cube 501 is made up of reflective surfaces 502 - 1 through 502 - 3 .
- reflective surfaces 502 - 1 through 502 - 3 form corner 506 .
- Corner cube 503 is made up of reflective surfaces 504 - 1 through 504 - 3 .
- Corner cube 505 is made up of reflective surfaces 514 - 1 through 514 - 3 .
- Corner cube 507 is made up of reflective surfaces 516 - 1 through 516 - 3 .
- Corner cube 509 is made up of reflective surfaces 518 - 1 through 518 - 3 .
- the octet-corner reflective array 500 is coupled to a location 530 on the surface 522 of an object 520 under test via connection rod 524 .
- the vibration (or motion) of the object 520 at the particular location 530 can be determined in different directions.
- motion sensing device 702 - 1 reflects a laser signal or beam off of corner cube 501 .
- the laser beam will measure the movement of the object 520 in the direction of the laser beam, no matter what the orientation of the corner cube 501 with respect to the laser beam.
- three independent non-coplanar laser beams created by laser beam generating circuits 701 - 1 , 701 - 2 and 701 - 3 ), the movement of an object 520 in any three orthogonal directions can be recovered.
- a flow diagram 800 of one embodiment of the present invention is illustrated.
- the flow process starts by attaching an embodiment of a corner reflective array of the present invention to an object to be tested ( 802 ).
- a first laser signal is reflected off of a corner cube of a corner reflective array attached to an object under test ( 804 ).
- a second laser signal is reflected off of a corner cube of the corner reflective array ( 808 ).
- the second laser signal has a path that is not planer to the path of the first laser signal.
- a third laser signal is reflected off of a corner cube of the corner reflective array ( 812 ).
- the third laser signal has a path that is not planer to the paths of the first or second laser signal.
- Movement of the object in the direction of the first laser signal, the second laser signal and the third laser signal is determined ( 806 , 810 and 814 ).
- the results of the movements in the specific directions are then processed ( 816 ).
- Using three non-coplanar laser signals on the corner reflective array provides information regarding vibration in three dimensions.
- FIG. 9 Another flow diagram 900 of another embodiment of the present invention is illustrated in FIG. 9 .
- multiple sets of vibrations in three dimensions are determined and then averaged.
- a first set of laser signals are applied to a corner cube of a corner reflective array ( 904 ).
- a second, third and nth set of laser signals are also applied to the corner reflective array ( 908 , 912 and 916 ).
- Each set of laser signals includes first, second and third non-coplanar laser signals.
- the vibration of an object, detected by the first, second, third and the nth sets of non-coplanar laser signals, in three dimensions are then determined ( 906 , 910 , 914 and 918 ).
- the results are then processed and the average vibration in three dimensions is presented ( 920 ).
Abstract
The present invention relates to vibration detection devices. In one embodiment a corner reflective array is provided. The corner reflective array includes at least one corner cube. Each corner cube includes three mutually perpendicular reflective surfaces that intersect in a corner.
Description
- This application is a divisional of Ser. No. 11/202,757 filed on Aug. 12, 2005.
- The present invention relates to vibration detection devices and in particular to devices that measure vibration in select directions.
- It is often desirable to measure the vibration of an object to evaluate how the object is performing. An excess amount of vibration can indicate possible problems. One type of device for measuring the vibration of an object is a laser doppler vibrometer (LDV). A LDV measures the vibration of an object without contact. Basically, a LDV works by reflecting a laser signal off of a surface of an object. The LDG then compares the frequency of the reflected signal with the original signal. A change in frequency (Doppler shift) indicates vibration (or movement) of the object. Moreover, the measured change in frequency is used to calculate the vibration of the object.
- Although LDV devices work in many applications their use has some limitations. For example, it is difficult to align light sensors of the LDV to receive the reflected laser light. Moreover, it is difficult with current LDV designs to obtain vibration measurements in multiple dimensions or multiple directions.
- For the reasons stated above and for other reasons stated below, which will become apparent to those skilled in the art upon reading and understanding the present specification, there is a need in the art for a vibration detection system using a LDV that provides for easy sensor alignment and vibration measurements in multiple dimensions.
- The above-mentioned problems and other problems are resolved by the present invention and will be understood by reading and studying the following specification.
- In one embodiment of the invention, a corner reflective array is provided. The corner reflective array includes at least one corner cube. Each corner cube includes three mutually perpendicular reflective surfaces that intersect in a corner.
- In another embodiment, another corner reflective array is provided. The corner reflective array includes one or more corner arrays. Each corner array includes a first, second and third reflective surface. The first reflective surface is positioned in a plane along a first axes. The second reflective surface positioned in a plane along a second axes and the third reflective surface positioned in a plane along a third axes.
- In still another embodiment, a vibration test system is provided. The test system includes one or more motion sensing devices and at least one corner cube. The one or more motion sensing devices are adapted to reflect laser signals off of a reflective surface and determine motion via the reflected laser signals. Each corner cube includes three mutually perpendicular reflective surfaces that intersect in a corner. Each reflective surface is adapted to reflect the laser signals from the one or more motion sensing devices. Moreover, the at least one corner cube is adapted to be coupled to an object under test.
- In yet another embodiment, a method of testing vibrations in an object is provided. The method comprises attaching at least one corner cube to the object. Each corner cube includes three mutually perpendicular reflective surfaces that intersect in a corner. Reflecting at least one laser signal off of at least one of the reflective surfaces of a corner cube and determining the motion of the object in the direction of the at least one reflected laser signal.
- In yet still another embodiment a method of determining the vibration of an object is provided. The method comprises attaching a corner reflective array having at least one corner cube to an object to be tested. Each corner array including a first, second and third reflective surface. The first reflective surface positioned in a plane along a first axes. The second reflective surface positioned in a plane along a second axes. The third reflective surface positioned in a plane along a third axes, wherein the first, second and third axes are mutually perpendicular to each other. Reflecting a first laser signal off of a corner cube and determining the motion of the object in the direction of the first laser signal based on the reflected first laser signal.
- In another embodiment, a method of determining vibration of an object in three dimensions is provided. The method comprises directing one or more sets of laser signals at one or more corner cubes of a corner cube array attached to the object. Each set of laser signals includes non-coplanar first, second and third laser signals. The method further includes determining the vibration of the object in three dimensions based on at least one set of laser signals reflected off of the one or more corner cubes of the corner cube array.
- In further another embodiment, a motion detection device is provided. The motion detection device includes a corner cube array means adapted to reflect laser beams back in the direction they were received from and a means to determine the motion in the direction of the reflected laser beam.
- The present invention can be more easily understood and further advantages and uses thereof are more readily apparent, when considered in view of the description of the specific embodiments and the following figures in which:
-
FIG. 1A is an isometric view of a reflective device of one embodiment of the present invention; -
FIG. 1B is a top view of the reflective device ofFIG. 1A : -
FIG. 1C is an isometric view of a reflective device ofFIG. 1A attached to an object under test; -
FIG. 2A is an isometric view of another embodiment of a reflective device of the present invention; -
FIG. 2B is a top view of the reflective device ofFIG. 2A ; -
FIG. 2C is an isometric view of the reflective device ofFIG. 2A attached to an object under test; -
FIG. 3 is an isometric view of another embodiment of a reflective device of the present invention attached to an object under test; -
FIG. 4 is a isometric view of another embodiment of a reflective device of the present invention attached to an object under test; -
FIG. 5 is a isometric view of yet another embodiment of a reflective device of the present invention attached to an object under test; -
FIG. 6 is a isometric view of still another embodiment of a reflective device of the present invention attached to an object under test; -
FIG. 7 is a isometric view of a reflective device ofFIG. 5 attached to an object under test with a LVD system applied; -
FIG. 8 is a flow diagram of one embodiment of the present invention; -
FIG. 9 is a flow diagram of yet another embodiment of the present invention. - In accordance with common practice, the various described features are not drawn to scale but are drawn to emphasize specific features relevant to the present invention. Reference characters denote like elements throughout Figures and text.
- In the following detailed description of specific embodiments, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the inventions may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, and it is to be understood that other embodiments may be made utilized and that logical, mechanical and electrical changes may be made without departing from the spirit and scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the claims and equivalents thereof.
- Embodiments of the present invention provide corner reflective arrays having tri-corner cubes that allow a LDV, or similar device, to measure vibration information of an object in different directions. In particular, in embodiments of the present invention, each tri-corner cube (or corner cube) includes three mutually perpendicular panels with reflective surfaces. The three panels in each corner cube intersect at a corner. The reflective surfaces may be mirrored or made from a reflective metal in some other way. In addition, it is sometimes desired to determine the vibration of an object at a select location on the object. Accordingly, embodiments of the present invention allow for a LDV system, or similar system, to obtain vibration measurements in multiple directions at a single location.
- Referring to
FIG. 1A , an isometric view of a bi-corner reflective array 100 (or bi-corner array 100) of one embodiment of the present invention is disclosed. As illustrated, this embodiment includespanels panel panel FIG. 1A , the panels are positioned to form twocorner cubes panels reflective array 100. In particular, reflective surfaces 102-1 through 102-3 are attached to each of thepanels reflective corner cube 101 and reflective surfaces 104-1 through 104-3 are coupled torespective panels reflective corner cube 103. In embodiments of the present inventions, the reflective surfaces of each corner cube meet at a corner. For example, referring tocorner cube 101 the reflective surfaces 102-1 through 102-3 meet atcorner 106. Referring to the top view of the bi-cornerreflective array 100 ofFIG. 1B , the reflective surfaces 104-1 through 104-3 meet atcorner 108. - Referring to
FIG. 1C the bi-cornerreflective array 100 is illustrated as being attached to asurface 122 of an object undertest 120. Since eachcorner cube corner cube 101, three lasers (or a single laser in combination with a beam splitter) can be used to reflect a laser signal off of a respective reflective surface 102-1, 102-2 and 102-3 to determine the Doppler shift in three axes. This can be used to determine the vibration of theobject 120 under test in three axes. Moreover, with thebi-corner array 100 embodiment, two reflective surfaces per axes can be used. Hence, the bi-corner array gives the option of two different reflective surfaces to reflect a laser signal off of rather than a single reflective surface a single corner cube would provide. Accordingly, this allows for greater options in setting up a laser and receiver. For example, referring toFIG. 1C , to determine the vibration in an axis alongpanel 110, a laser signal can be reflected off of reflective surface 102-3 or reflective surface 104-3. - In addition, the positioning of three mutually perpendicular reflective surfaces that make up each
corner cube - Although
FIGS. 1A through 1B illustrate the panels forming corner cubes having reflective surfaces that are square or rectangular in shape, other shapes like semi circles may be used and this invention is not limited to a specific shape of the reflective surfaces. For example,FIG. 2A illustrates a bi-cornerreflective array 200 of one embodiment of the present invention using triangle shaped reflective surfaces 201-1 through 201-3 and 204-1 through 204-3. Like the previous embodiments, thepanels FIG. 2A and the top view of the bi-cornerreflective array 200 ofFIG. 2B , the reflective surfaces 201-1 through 201-3form corner 206 and reflective surfaces 204-1 through 204-3form corner 208.FIG. 2C illustrates the bi-cornerreflective array 200 coupled to asurface 222 of anobject 220 to be tested for vibration. -
FIG. 3 , further illustrates a quad-cornerreflective array 300 of another embodiment of the present invention. This embodiment has fourcorner cubes corner cubes perpendicular panels corner cube 301 is formed by reflective surfaces 302-1 through 302-3 ofrespective panels form corner 306.Corner cube 303 is formed by reflective surfaces 304-1 through 304-3 ofrespective panels corner cube 305 is formed by reflective surfaces 314-1 through 314-3 ofrespective panels panels panels panels FIG. 3 , the quad-cornerreflective array 300 is attached to asurface 322 of anobject 320 under test. -
FIG. 4 , illustrates another quad-cornerreflective array 400 of another embodiment of the present invention. In this embodiment, the reflective surfaces are in a shape of a triangle. This embodiment has fourcorner cubes corner cubes perpendicular panels corner cube 401 is formed by reflective surfaces 402-1 through 402-3 ofrespective panels form corner 406.Corner cube 403 is formed by reflective surfaces 404-1 through 404-3 ofrespective panels corner cube 405 is formed by reflective surfaces 414-1 through 414-3 ofrespective panels corner cube 407 is formed by three reflective surfaces ofpanels FIG. 3 , the quad-cornerreflective array 400 is attached to asurface 422 of anobject 420 under test. - Referring to
FIG. 5 , an octet-cornerreflective array 500 of another embodiment of the present invention is illustrated. In this embodiment, eight corner cubes are formed frompanels corner cubes reflective array 500 cannot be seen in the perspective view ofFIG. 5 . As illustrated,corner cube 501 is made up of reflective surfaces 502-1 through 502-3. Moreover, reflective surfaces 502-1 through 502-3form corner 506.Corner cube 503 is made up of reflective surfaces 504-1 through 504-3.Corner cube 505 is made up of reflective surfaces 514-1 through 514-3.Corner cube 507 is made up of reflective surfaces 516-1 through 516-3.Corner cube 509 is made up of reflective surfaces 518-1 through 518-3. In the embodiment ofFIG. 5 , the octet-cornerreflective array 500 is coupled to alocation 530 on thesurface 522 of anobject 520 under test viaconnection rod 524. In this embodiment, the vibration (or motion) of theobject 520 at theparticular location 530 can be determined in different directions. - Another octet-corner
reflective array 600 of another embodiment of the present invention is illustrated inFIG. 6 . In thisembodiment panels corner cube 601 includes triangular shaped reflective surfaces 602-1 through 602-3 that formcorner 606;corner cube 603 includes triangular shaped reflective surfaces 604-1 through 604-3;corner cube 605 includes triangular shaped reflective surfaces 614-1 through 614-3; andcorner cube 609 includes triangular shaped reflective surfaces 618-1 through 618-3. The octet-cornerreflective cube 600 is coupled to alocation 630 on thesurface 622 of an object under test. - Referring to
FIG. 7 , a system of testing vibration in three orthogonal directions at thelocation 530 on thesurface 522 of theobject 520 under test using the octet-cornerreflective array 500 ofFIG. 5 is illustrated. As illustrated, motion sensing devices 702-1 through 702-3, such as lasers circuits, are used to determine vibration of theobject 520 atlocation 530. Each motion sensing device 702-1 through 702-3 includes a laserbeam generating circuit 710 and a laserbeam detection circuit 712. Each laserbeam generating circuit 710 transmits a laser beam. Each laserbeam detector circuit 712 is designed to receive reflected laser beam signals. As illustrated inFIG. 7 , motion sensing device 702-1 reflects a laser signal or beam off ofcorner cube 501. In this example, the laser beam will measure the movement of theobject 520 in the direction of the laser beam, no matter what the orientation of thecorner cube 501 with respect to the laser beam. With three independent non-coplanar laser beams (created by laser beam generating circuits 701-1, 701-2 and 701-3), the movement of anobject 520 in any three orthogonal directions can be recovered. - Referring to
FIG. 8 , a flow diagram 800 of one embodiment of the present invention is illustrated. The flow process starts by attaching an embodiment of a corner reflective array of the present invention to an object to be tested (802). A first laser signal is reflected off of a corner cube of a corner reflective array attached to an object under test (804). A second laser signal is reflected off of a corner cube of the corner reflective array (808). The second laser signal has a path that is not planer to the path of the first laser signal. A third laser signal is reflected off of a corner cube of the corner reflective array (812). The third laser signal has a path that is not planer to the paths of the first or second laser signal. Movement of the object in the direction of the first laser signal, the second laser signal and the third laser signal is determined (806, 810 and 814). The results of the movements in the specific directions are then processed (816). Using three non-coplanar laser signals on the corner reflective array provides information regarding vibration in three dimensions. - Another flow diagram 900 of another embodiment of the present invention is illustrated in
FIG. 9 . In this embodiment, multiple sets of vibrations in three dimensions are determined and then averaged. In particular, as illustrated inFIG. 9 , a first set of laser signals are applied to a corner cube of a corner reflective array (904). A second, third and nth set of laser signals are also applied to the corner reflective array (908, 912 and 916). Each set of laser signals includes first, second and third non-coplanar laser signals. The vibration of an object, detected by the first, second, third and the nth sets of non-coplanar laser signals, in three dimensions are then determined (906, 910, 914 and 918). The results are then processed and the average vibration in three dimensions is presented (920). - Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that any arrangement, which is calculated to achieve the same purpose, may be substituted for the specific embodiment shown. This application is intended to cover any adaptations or variations of the present invention. Therefore, it is manifestly intended that this invention be limited only by the claims and the equivalents thereof.
Claims (10)
1. A corner reflective array comprising:
one or more corner arrays, each corner array including a first, second and third reflective surface, the first reflective surface positioned in a plane along a first axes, the second reflective surface positioned in a plane along a second axes and the third reflective surface positioned in a plane along a third axes.
2. The corner cube array of claim 1 , wherein the first, second and third reflective surfaces of each corner array are mutually perpendicular to each other.
3. The corner cube array of claim 1 , wherein the first, second and third reflective surfaces of each reflective surface intersect in a corner.
4. The corner cube array of claim 1 , wherein the shape of the each of the first, second and third reflective surfaces of each corner array is one of a square, rectangle, triangle and a quarter circle.
5 . The corner cube array of claim 1 , wherein at least one of the first, second and third reflective surfaces of each corner array is made from a double sided mirror.
6. The corner cube array of claim 1 , wherein the one or more corner arrays includes at least one of two, four and eight corner arrays.
7. A method of determining the vibration of an object, the method comprising:
attaching a corner reflective array having at least one corner cube to an object to be tested, each corner array including a first, second and third reflective surface, the first reflective surface positioned in a plane along a first axes, the second reflective surface positioned in a plane along a second axes and the third reflective surface positioned in a plane along a third axes, wherein the first, second and third axes are mutually perpendicular to each other;
reflecting a first laser signal off of a corner cube; and
determining the motion of the object in the direction of the first laser signal based on the reflected first laser signal.
8. The method of claim 7 , further comprising:
reflecting at least one additional signal off one of the at least one corner cube of the corner reflective array, each additional laser signal not being in the plane of the first and any other additional signal.
9. A method of determining vibration of an object in three dimensions, the method comprising:
directing one or more sets of laser signals at one or more corner cubes of a corner cube array attached to the object, wherein each set of laser signals includes non-coplanar first, second and third laser signals; and
determining the vibration of the object in three dimensions based on at least one set of laser signals reflected off of the one or more corner cubes of the corner cube array.
10. The method of claim 9 , further comprising:
averaging vibrations determinations based on two or more sets of reflected laser signals.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/101,394 US20090040535A1 (en) | 2005-08-12 | 2008-04-11 | Reflective corner cube array |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/202,757 US7374296B2 (en) | 2005-08-12 | 2005-08-12 | Reflective corner cube array |
US12/101,394 US20090040535A1 (en) | 2005-08-12 | 2008-04-11 | Reflective corner cube array |
Related Parent Applications (1)
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US11/202,757 Division US7374296B2 (en) | 2005-08-12 | 2005-08-12 | Reflective corner cube array |
Publications (1)
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US20090040535A1 true US20090040535A1 (en) | 2009-02-12 |
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US11/202,757 Expired - Fee Related US7374296B2 (en) | 2005-08-12 | 2005-08-12 | Reflective corner cube array |
US12/101,394 Abandoned US20090040535A1 (en) | 2005-08-12 | 2008-04-11 | Reflective corner cube array |
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US11/202,757 Expired - Fee Related US7374296B2 (en) | 2005-08-12 | 2005-08-12 | Reflective corner cube array |
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US (2) | US7374296B2 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007053677A2 (en) * | 2005-11-01 | 2007-05-10 | The Arizona Board Of Regents On Behalf Of The University Of Arizona | Polarization coupling cube-corner retro-reflectors |
JP2008267682A (en) * | 2007-04-19 | 2008-11-06 | Denso Corp | Fluid heating device and exhaust gas post-treatment device equipped with same |
KR100925995B1 (en) * | 2008-05-02 | 2009-11-09 | 김강현 | Method for fabricating retroreflective unit |
KR100925994B1 (en) * | 2008-05-02 | 2009-11-09 | 김강현 | Retroreflective sheet and method thereof |
EP2161597B1 (en) * | 2008-09-03 | 2014-06-04 | Brainlab AG | Image-assisted operation system |
US20150048572A1 (en) * | 2013-03-29 | 2015-02-19 | American Pacific Plastic Fabricators, Inc. | Buoyant target with laser reflectivity |
JP6650878B2 (en) * | 2015-04-20 | 2020-02-19 | パナソニックIpマネジメント株式会社 | Vibration visualization element and vibration measurement system |
Citations (8)
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US3977765A (en) * | 1974-05-17 | 1976-08-31 | Lipkins Morton S | Hollow retroreflector mount |
US4848160A (en) * | 1987-10-21 | 1989-07-18 | M/Rad Corporation | Multi-axis test fixture system |
US5109362A (en) * | 1990-10-22 | 1992-04-28 | Shell Oil Company | Remote seismic sensing |
US5589981A (en) * | 1994-03-10 | 1996-12-31 | Aerospatiale Societe Nationale Industrielle | Retroreflector target for laser ranging |
US20020118373A1 (en) * | 1999-05-19 | 2002-08-29 | Hadass Eviatar | Method for detecting movement of a sample primarily for use in magnetic resonance imaging of the sample |
US6655215B2 (en) * | 2001-06-15 | 2003-12-02 | Honeywell International Inc. | Inverse corner cube for non-intrusive three axis vibration measurement |
US6744059B2 (en) * | 2001-08-21 | 2004-06-01 | Spx Corporation | Optical path structure for open path emissions sensing with spinning mirror |
US20060087735A1 (en) * | 2004-05-12 | 2006-04-27 | Reflexite Corporation | Retroreflective structures |
-
2005
- 2005-08-12 US US11/202,757 patent/US7374296B2/en not_active Expired - Fee Related
-
2008
- 2008-04-11 US US12/101,394 patent/US20090040535A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3977765A (en) * | 1974-05-17 | 1976-08-31 | Lipkins Morton S | Hollow retroreflector mount |
US4848160A (en) * | 1987-10-21 | 1989-07-18 | M/Rad Corporation | Multi-axis test fixture system |
US5109362A (en) * | 1990-10-22 | 1992-04-28 | Shell Oil Company | Remote seismic sensing |
US5589981A (en) * | 1994-03-10 | 1996-12-31 | Aerospatiale Societe Nationale Industrielle | Retroreflector target for laser ranging |
US20020118373A1 (en) * | 1999-05-19 | 2002-08-29 | Hadass Eviatar | Method for detecting movement of a sample primarily for use in magnetic resonance imaging of the sample |
US6655215B2 (en) * | 2001-06-15 | 2003-12-02 | Honeywell International Inc. | Inverse corner cube for non-intrusive three axis vibration measurement |
US6744059B2 (en) * | 2001-08-21 | 2004-06-01 | Spx Corporation | Optical path structure for open path emissions sensing with spinning mirror |
US20060087735A1 (en) * | 2004-05-12 | 2006-04-27 | Reflexite Corporation | Retroreflective structures |
Also Published As
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US20070035835A1 (en) | 2007-02-15 |
US7374296B2 (en) | 2008-05-20 |
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