CN1680815B - Local monitoring wireless sensor of vinylidene difluoride - Google Patents
Local monitoring wireless sensor of vinylidene difluoride Download PDFInfo
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- CN1680815B CN1680815B CN 200410013660 CN200410013660A CN1680815B CN 1680815 B CN1680815 B CN 1680815B CN 200410013660 CN200410013660 CN 200410013660 CN 200410013660 A CN200410013660 A CN 200410013660A CN 1680815 B CN1680815 B CN 1680815B
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Abstract
A radio transducer consists of kynar piezoelectric film; microprocessing unit module formed by microprocessor, crystal oscillation circuit, A / D modulation circuit and filtering circuit; and radio transmit - receive module. It is featured as setting kynar piezoelectric film on structure to be tested, mocroprocessing unit module and radio transmit - receive module in the same shell for using one power supply; connecting microprocessor UART port to radio communication module and kynar piezoelectric film to wire of inputting - microprocessing unit module.
Description
(1) technical field
The utility model relates to a kind of monitoring device, specifically a kind of wireless senser that is used for civil engineering structure area monitoring.
(2) background technology
For some are at the structure or the member of labour in the civil engineering work, they make structure or member be in discrete state because may there be damage or defective in various degree in a variety of causes.When having the structure of damage or member and bearing the alternation load, though its load level far below the strength degree of material itself, crackle also may germinate and expand, thereby causes the drag of structure or member to reduce, safety indexes reduces, and brings potential safety hazard.The crack initiation of monitoring of structures and expansion situation can provide direct information with the damage location for the man-rate of structure, are one of important measures that guarantee structural safety.
At present, what the data acquisition of various monitoring structural health conditions was mainly adopted is that tradition " wired " sensor is realized, acquired signal is accurate, vulnerability to jamming good although this acquisition mode has, the characteristics of product seriation, but the monitoring network wiring amount of utilizing " wired " sensor to form is big, maintenance cost is high, poor reliability, even can't realize wiring in some structures.Along with sensing technology, development of wireless communication devices, wireless sensor technology has begun to civil structure monitoring infiltration and has become the focus that this respect is studied.
The research of piezopolymer just began as far back as the forties in 20th century, and after Kawai in 1969 found that the polyvinylidene fluoride (Polyvinylidene Fluoride is called for short PVDF) after the polarization just has piezoelectricity, piezopolymer had been pushed to practicability.Bergmann in 1971 have found the pyroelectricity of PVDF again.Beginning of the eighties late 1970s, the discovery of PVDF and copolymer ferroelectric thereof caused the concern on scientific and technical boundary.PVDF and multipolymer thereof are as a kind of flexible piezoelectric material of stable chemical performance, can manufacture large area film, its acoustic impedance acoustic impedance easy and water and biosome is complementary, and can be widely used in ultrasonic transducer, underwater acoustic transducer, biology sensor, pyroelectric electric device etc.The PVDF piezoelectric membrane is a kind of high molecular polymer with piezoelectric effect, pliability is good, corrosion-resistant, density is low, minimum thickness can accomplish to have only several microns, and piezoelectric voltage constant height: PVDF piezoelectric film material and inorganic material piezoelectric ceramics PZT etc. are relatively, the voltage that same stress produces can reach more than 10 times, and PVDF combines the back with basal body structure very little to the performance impact of structure, utilize this characteristic people to carry out the research of sensors such as power, acceleration, displacement, strain, these all are that it provides the foundation in the civil engineering work health monitoring.
This development becomes one area monitoring's sensor, microprocessor, radio receiving transmitting module and the energy module that PVDF constitutes, and constitutes the wireless PVDF sensor of civil engineering structure area monitoring.Also be in the Primary Study stage although wireless senser is applied to civil structure monitoring, sensor node is easy to assembling and disassembling, save the expense of laying lead and save characteristics such as set-up time has determined wireless PVDF sensor to have broad prospects and practical value.
(3) summary of the invention
The purpose of this utility model is to provide a kind of hardware unit that can carry out area monitoring, Signal Pretreatment, wireless transmission to civil engineering structure, and realizes the integrated polyvinylidene fluoride area monitoring wireless senser of signal acquisition process element and radio receiving transmitting module.
The object of the present invention is achieved like this: it comprises the polyvinylidene fluoride piezoelectric membrane, the microprocessing unit module of forming by microprocessor, crystal oscillating circuit, A/D modulation circuit and filtering circuit, and radio receiving transmitting module, the polyvinylidene fluoride piezoelectric membrane is installed in by on the geodesic structure, microprocessing unit module and radio receiving transmitting module are arranged in the same housing and a shared power supply, the UART mouth of microprocessor links to each other with radio receiving transmitting module, is connected with the lead that can import the microprocessing unit module on the polyvinylidene fluoride piezoelectric membrane.
The utility model can also comprise some architectural features like this:
1, between polyvinylidene fluoride piezoelectric membrane and microprocessing unit module, is provided with charge amplifier.
2, microprocessing unit module, radio receiving transmitting module and power supply adopt the up-down structure layered arrangement in housing.
3, consisting of of radio receiving transmitting module: the crystal oscillator Y90 of resistance R 91, capacitor C 91, C92,4M and U5 (model is NRF401, and concrete leg signal form is seen Fig. 2 chip mark) pin 1,20 connects and composes crystal oscillating circuit; C94 and R92 series connection are connected to the loop filter that U5 pin 3,4 is connected to form U5 again with after C93 is in parallel; Inductance L 91 connects and composes Voltage-Controlled oscillation circuit with U5 pin 5,6; C95, C98 are connected with U5 pin 13, and C97 is connected with U5 pin 8, and C96 is connected with U5 pin 2, form the power supply filtering circuit of U5 jointly; R93 and U5 pin join and constitute emissive power circuit is set; Antenna (LOOP ANTENA) and C99 are connected to U5 pin 15,16 and constitute antenna loop; Pin 3,7,14,17 ground connection of U5; 2,8,13 connect power supply; Pin 4, the pin 10 of the pin 9 fishplate bar edge connector CON7 of U5 connects CON7 pin 3, pin 12 connects the pin 2 of CON7, the pin 6 that pin 18 meets CON7, the pin 7 that pin 19 meets CON7; C80, C81 are connected to power supply and the ground of CON7, constitute electric source filter circuit;
Consisting of of microprocessing unit module and charge amplifier: the terminal U6 pin 1 ("-" end) that connects the input of PVDF sensor connects "-" end of operational amplifier OP3 (adopting the CA3140 type), and "+" that U6 pin 2 ("+" end) meets OP3 holds ground connection together; By R61, C61 and connect U6 pin "-" end, output terminal and forms the high input impedance that the capacitor of OP3 feeds back, the operational amplifier of high-gain; The end of the preliminary electric signal connecting resistance R62 that amplifies, R62, R63 are connected to amplifier OP4 (adopting the UA741 type) and constitute feedback amplifier; Signal after the amplification is received microprocessor U4 (adopting the ATMEGA8L type) pin 28 by the output terminal of OP4; R71, C71 link to each other with U4 pin 1 and constitute electrify restoration circuit; The crystal oscillator Y70 that C72, C73 are connected with U4 pin 9,10 constitutes crystal oscillating circuit; Light emitting diode D71, D72 and resistance R 72, R73 form signal display circuit, link to each other with U4 pin 15,16; R74, R75, C74, C75 and U4 pin 20,21 constitute the analog acquisition auxiliary circuit; U4 pin 4,5,6,11,17,18,19,23,24,25,26,27 does not connect; U4 pin 13 is connected with the CON7 pin 6 of radio receiving transmitting module, and U4 pin 14 links to each other with the CON7 pin 7 of radio receiving transmitting module; U4 pin 12 links to each other with CON7 pin 2; U4 pin 7 connects power supply, pin 8 and 22 ground connection.
4, consisting of of radio receiving transmitting module: the pin 1 of an end of resistance R 21, capacitor C 23 and chip U2 (i.e. the AT90S231 of 20 pin, the corresponding mark of leg signal is seen Fig. 3) links to each other and constitutes electrify restoration circuit; Capacitor C 24, a C25 end in parallel and ground, the other end and the power supply formation filtering circuit that joins; Capacitor C 21, the C22 one end ground connection other end in parallel connect the crystal oscillating circuit of the crystal oscillator Y21 formation U2 of 10M respectively; The pin 7,8,9,15,16,17,18,19 of U2 does not have connection, 10 ground connection, 20 connect power supply; Pin 9, the pin 2 that the pin 1 of U2 meets CON9 (i.e. the edge-board connector of 9 pin) connects the pin 7 that CON9 pin 6, pin 3 meet CON9; Pin 24 is connected the pin 6 of U2, pin 11 is connected with U3 pin 27, pin 12 is connected with U3 pin 26, pin 13 is connected with U3 pin 25, pin 14 is connected with U3 pin 23 with chip U3 (being CC1000); Inductance L 31, L32, capacitor C 31, C32, C33, antenna E31 connect and compose the reception radiating portion, and this part is connected with pin 3, the pin 4 of U3; L33 connects the pin 10,11 of U3, constitutes Voltage-Controlled oscillation circuit; R31 is connected to the pin 13 of U3; Capacitor C 39, C40 and the 14.7456M crystal oscillator Y31 that is connected to the pin 17,18 of U3 constitute crystal oscillating circuit; The pin 1,5,9,15,21 of U3 connects power supply, pin 2,6,7,8,14,16,19,20,22 ground connection, and pin 12,28 does not have connection;
Consisting of of microprocessing unit module and charge amplifier: U1 (promptly connecing the terminal of PVDF sensor input) pin 1 connects "-" end of operational amplifier OP1 (adopting CA3140), and "+" that U1 pin 2 meets OP1 holds ground connection together; By R11, C11 and connect the operational amplifier that U1 pin "-" end, output terminal are formed the high input impedance high-gain that the OP1 capacitor feeds back; The end of the preliminary electric signal connecting resistance R12 that amplifies, R12, R13 are connected to amplifier OP2 (adopting UA741) and constitute feedback amplifier; Signal after the amplification is received microprocessor U0 (ATMEGA8L, the corresponding mark of leg signal is seen Fig. 3) pin 28 by the output terminal of OP2; R01, C01 link to each other with U0 pin 1 and constitute electrify restoration circuit; The crystal oscillator Y00 that C02, C03 are connected with U0 pin 9,10 constitutes crystal oscillating circuit; Light emitting diode D01, D02 and resistance R 02, R03 form signal display circuit, and link to each other with U0 pin 15,16 R04, R05, C04, C05 and U0 pin 20,21 constitute the analog acquisition auxiliary circuit; U0 pin 4,5,6,11,12,14,17,18,19,23,24,25,26,27 does not connect; U0 pin 3 is connected with the CON9 pin 6 of radio receiving transmitting module; U0 pin 13 is connected with the CON9 pin 9 of radio receiving transmitting module, controls that radio receiving transmitting module resets so that operate as normal again under the situation of malfunction.
The invention has the advantages that: area monitoring's sensor, microprocessor, radio receiving transmitting module and energy module that PVDF is constituted become one, and constitute the wireless PVDF sensor of civil engineering structure area monitoring.Also be in the Primary Study stage although wireless senser is applied to civil structure monitoring, sensor node is easy to assembling and disassembling, save the expense of laying lead and save characteristics such as set-up time has determined wireless PVDF sensor to have broad prospects and practical value.
Utilize the processing capacity of microprocessor, signals collecting, pre-service, excitation radio receiving transmitting module are sent data.1, wireless PVDF sensor adopts modular design, is made of PVDF strain module, microprocessing unit module, radio receiving transmitting module, energy module.2, modulation PVDF is output as the electric signal of standard, and draws output signal line.3, select microprocessor for use, the design sample circuit, microprocessor should be low-power consumption.4, the UART mouth with microprocessor links to each other with radio receiving transmitting module.5, integrated energy module, microprocessor and radio receiving transmitting module are in one.6, the microprocessing unit module is reserved PVDF terminal mouth.7, microprocessing unit module, radio receiving transmitting module, energy module size unanimity.Wireless PVDF sensor solved and utilized the strain of PVDF sensor test structure partial, to strain signal pre-service and wireless transmission of signal problem: utilize the characteristics that PVDF piezoelectric membrane pliability is good, corrosion-resistant, density is low, piezoelectric effect is good, overcome the shortcoming that fragility is big, impact resistance is poor, density is higher of the piezoelectric ceramics that in the past used, local train situation that can better reflect structure; Utilize microprocessor to gather the standard electric signal of PVDF output, the signal of collection can simply be handled with the embedded software of microprocessor, as filtering etc.; Signal after the processing can directly utilize radio receiving transmitting module to be real-time transmitted on the PC, has also strengthened the real-time of signal transmission when reducing wiring.In addition, the device of being developed can be formed network and constitute the system of area monitoring, and by the PC unified management, this has further strengthened fault-tolerance, thereby has increased the reliability that whole monitoring system is diagnosed.
(4) description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the electrical block diagram of a kind of embodiment of the present utility model;
Fig. 3 is the electrical block diagram of another embodiment of the present utility model.
(5) concrete enforcement
For example the utility model is done description in more detail below in conjunction with accompanying drawing:
Embodiment one, the composition of polyvinylidene fluoride area monitoring wireless senser comprises polyvinylidene fluoride piezoelectric membrane 1 as shown in the figure, by microprocessor, crystal oscillating circuit, the microprocessing unit module 2 that A/D modulation circuit and filtering circuit are formed, and radio receiving transmitting module 3. polyvinylidene fluoride piezoelectric membranes are installed in by on the geodesic structure, microprocessing unit module and radio receiving transmitting module are arranged in the same housing and a shared power supply 4, the UART mouth of microprocessor links to each other with radio receiving transmitting module, is connected with the lead that can import the microprocessing unit module on the polyvinylidene fluoride piezoelectric membrane. between polyvinylidene fluoride piezoelectric membrane and microprocessing unit module, be provided with charge amplifier 5. microprocessing unit modules, radio receiving transmitting module and power supply adopt the up-down structure layered arrangement in housing.
In conjunction with Fig. 2, be to be the common wireless PVDF sensor of forming of radio receiving transmitting module, microprocessor unit ATMEGA8L and PVDF treatment circuit of core with NRF401 simultaneously.Entire circuit is made up of the circuit board that wireless transceiver circuit plate and microprocessor and PVDF treatment circuit constitute, 2 circuit boards couple together by edge-board connector CON7, wherein the PVDF sensor is attached on the tested object, draw two leads and do signal output, on the terminal of the circuit board that access microprocessor and PVDF treatment circuit constitute.Concrete electrical connection situation is as follows: for radio receiving transmitting module, the crystal oscillator Y90 of resistance R 91, capacitor C 91, C92,4M and U5 (NRF401, down together) pin 1,20 connects and composes crystal oscillating circuit.C94 and R92 series connection are connected to the loop filter that U5 pin 3,4 is connected to form U5 again with after C93 is in parallel, realize filter action.Inductance L 91 connects and composes Voltage-Controlled oscillation circuit with U5 pin 5,6, produces the oscillation frequency of U5.C95, C98 are connected with U5 pin 13, and C97 is connected with U5 pin 8, and C96 is connected with U5 pin 2, form the power supply filtering circuit of U5 jointly.R93 and U5 pin join and constitute emissive power circuit is set, and set emissive power.Antenna (LOOP ANTENA) and C99 are connected to U5 pin 15,16 and constitute antenna loop.Pin 3,7,14,17 ground connection of U5 (being GND, down together), 2,8,13 connect power supply (being Vcc, down together).The pin 9 of U5 connects CON7 (the i.e. edge-board connector of 7 pin, pin 4, pin 10 down together) connects CON7 pin 3, pin 12 connects the pin 2 of CON7, the pin 6 that pin 18 meets CON7, the pin 7 that pin 19 meets CON7, receiving CON7 mainly is for the circuit board with microprocessor and PVDF treatment circuit formation is connected, and finishes the wireless receiving and dispatching of data jointly.C80, C81 are connected to power supply and the ground of CON7, constitute electric source filter circuit; Circuit board for microprocessor and PVDF treatment circuit formation, the electric charge multiplying arrangement that the PVDF treatment circuit mainly is made up of operational amplifier, the variation charge conversion that PVDF is produced becomes fiduciary level (as 0-5V), U6 (promptly connects the terminal of PVDF sensor input, down together) pin 1 meets operational amplifier OP1 and (adopts CA3140, "-" end down together), "+" that U6 pin 2 meets OP1 holds ground connection together.By R61, C61 and connect U6 pin "-" end, output terminal and forms the high input impedance that the capacitor of OP1 feeds back, the operational amplifier of high-gain, the PVDF electric charge is tentatively amplified.The end of the preliminary electric signal connecting resistance R62 that amplifies, R62, R63 are connected to amplifier OP4 and (adopt UA741, constitute feedback amplifier down together), enlargement factor can be mediated according to the actual acquisition situation, signal after the amplification is received U4 (microprocessor ATMEGA8L by the output terminal of OP4, the corresponding mark of leg signal is seen Fig. 2, down together) pin 28, according to the program that U4 inside embeds signal is gathered.R71, C71 link to each other with U4 pin 1 and constitute electrify restoration circuit, and the crystal oscillator Y70 that C72, C73 are connected with U4 pin 9,10 constitutes crystal oscillating circuit, the processing speed of control U4.Light emitting diode D71, D72 and resistance R 72, R73 form signal display circuit, link to each other with U4 pin 15,16, and by the next light on and off according to actual conditions control D71, D72 of the inner program that embeds of U4.R74, R75, C74, C75 and U0 pin 20,21 constitute the analog acquisition auxiliary circuits, and to gather simulating signal designed for U4.U4 pin 4,5,6,11,17,18,19,23,24,25,26,27 does not connect, can be according to the actual flexible configuration that requires.U4 pin 13 is connected with the CON7 pin 6 of radio receiving transmitting module, and U4 pin 14 links to each other with the CON7 pin 7 of radio receiving transmitting module, the wireless receiving and dispatching of common control signal.Be output as high level when U4 pin 13 is output as high level and U4 pin 14 according to program according to program, U4 pin 3 is connected the PVDF signal that can finish gathering and passes to U5 with the CON7 pin 4 of radio receiving transmitting module, launch with wireless form.Be output as low level when U4 pin 13 is output as high level and U4 pin 14 according to program according to program, U4 pin 2 is connected with the CON7 pin 3 of radio receiving transmitting module and the data that U5 receives can be passed to U4, finishes data wireless and receives.U4 pin 12 links to each other with CON7 pin 2, the selection of control wireless communication, and the high level communication channel is 434.33MHz, the low level signaling channel is 433.92MHz.U4 pin 7 connects power supply, pin 8 and 22 ground connection.Power supply adopts the 2 common 1.5V batteries of joint usually or adopts lithium battery to constitute.
Simultaneously in conjunction with Fig. 3, second kind of embodiment of the present utility model is: CC1000 is the radio receiving transmitting module of core and microprocessor unit ATMEGA8L and the common wireless PVDF sensor of forming of PVDF treatment circuit. entire circuit is made up of the circuit board that wireless transceiver circuit plate and microprocessor and PVDF treatment circuit constitute, 2 circuit boards couple together by edge-board connector CON9, wherein the PVDF sensor is attached on the tested object, draw two leads and do signal output, on the terminal of the circuit board that access microprocessor and PVDF treatment circuit constitute. the situation that specifically is electrically connected is as follows: for radio receiving transmitting module, resistance R 21, one end of capacitor C 23 and chip U2 (the i.e. AT90S2313 of 20 pin, pin 1 down together) links to each other and constitutes electrify restoration circuit, make better initialization of entire circuit. capacitor C 24, a C25 end in parallel (is GND with ground, down together), the other end and power supply (are Vcc, the formation of joining filtering circuit down together), play power filter. capacitor C 21, the C22 one end ground connection other end in parallel connects the crystal oscillating circuit of the crystal oscillator Y21 formation U2 of 10M respectively, make U2 have the pin 7 of the processing speed .U2 of 10MIPS, 8,9,15,16,17,18,19 do not have connection (can use flexibly according to actual conditions), 10 ground connection, 20 pin 1 that meet power supply .U2 connect CON9 (the i.e. edge-board connector of 9 pin, pin 9 down together), pin 2 connects CON9 pin 6, pin 3 connects the pin 7 of CON9, the pin 6 of receiving CON9 and mainly being for the .U2 that is connected with circuit board that microprocessor and PVDF treatment circuit constitute (is CC1000 with chip U3, down together) pin 24 connects, pin 11 is connected with U3 pin 27, pin 12 is connected with U3 pin 26, pin 13 is connected with U3 pin 25, pin 14 is connected with U3 pin 23, the program that the continuous utilization of these pin is embedded in the U2 just can send data with wireless, form that also can be wireless receives data. inductance L 31, L32, capacitor C 31, C32, C33, antenna E31 is by connecting and composing the reception radiating portion among the figure, the pin 3 of this part and U3, pin 4 is connected, U3 transmits and receives the pin 10 that data .L33 meets U3 by this part circuit, 11, constitute Voltage-Controlled oscillation circuit, the oscillation frequency .R31 that produces U3 is connected to the pin 13 of U3, assist U3 to finish the data wireless transmitting-receiving. capacitor C 39, C40 and the pin 17 that is connected to U3,18 14.7456M crystal oscillator Y31 constitutes crystal oscillating circuit, finish the pin that .U3 is set 1 to transmitting-receiving speed, 5,9,15,21 connect power supply, pin 2,6,7,8,14,16,19,20,22 ground connection, pin 12,28 do not have the .C34 of connection, C35, C36, C37, C38 is common electric source filter circuit, needn't give unnecessary details; Circuit board for microprocessor and PVDF treatment circuit formation, the electric charge multiplying arrangement that the PVDF treatment circuit mainly is made up of operational amplifier, the variation charge conversion that PVDF is produced becomes fiduciary level (as 0-5V), U1 (promptly connects the terminal of PVDF sensor input, down together) pin 1 meets operational amplifier OP1 and (adopts CA3140, "-" end down together), "+" that U1 pin 2 meets OP1 holds ground connection together. by R11, C11 also connects U1 pin "-" end, the operational amplifier of the high input impedance high-gain of the capacitor feedback of output terminal composition OP1, the PVDF electric charge is tentatively amplified. the end of the preliminary electric signal connecting resistance R12 that amplifies, R12, R13 is connected to amplifier OP2 and (adopts UA741, constitute feedback amplifier down together), enlargement factor can be mediated according to the actual acquisition situation, signal after the amplification is received U0 (microprocessor ATMEGA8L by the output terminal of OP2, pin 28 down together), according to the program that U0 inside embeds signal is gathered .R01, C01 links to each other with U0 pin 1 and constitutes electrify restoration circuit, C02, C03 and U0 pin 9, the 10 crystal oscillator Y00 that are connected constitute crystal oscillating circuit, the processing speed of control U0. light emitting diode D01, D02 and resistance R 02, R03 forms signal display circuit, with U0 pin 15,16 link to each other, and it is next according to actual conditions control D01 by the inner program that embeds of U0, the light on and off .R04 of D02, R05, C04, C05 and U0 pin 20,21 constitute the analog acquisition auxiliary circuit, be to gather the designed .U0 pin 4 of simulating signal for U0,5,6,11,12,14,17,18,19,23,24,25,26,27 do not connect, can be connected with the CON9 pin 6 of radio receiving transmitting module according to the actual flexible configuration .U0 pin 3 that requires, finish the PVDF signal of gathering is passed to U2, launching .U0 pin 2 by U2 control U3 with wireless form again is connected with the CON9 pin 7 of radio receiving transmitting module, the data that U3 is received are after U2 handles, pass to U0, finishing data wireless reception .U0 pin 13 is connected with the CON9 pin 9 of radio receiving transmitting module, control that radio receiving transmitting module resets so that operate as normal again under the situation of malfunction. in addition, power supply adopts the 2 common 1.5V batteries of joint usually or adopts lithium battery to constitute.
The data processor of wireless PVDF sensor is embedded in the microprocessing unit, and the signal of PVDF sensor is gathered and pre-service, also the data after handling is sent simultaneously.The specific procedure flow process is: after powering on, utilize designed program that various parameters are carried out initialization, control ATMEGA8L then and be in wait reception data mode always, in case receive the data that configure in advance, ATMEGA8L sends data, receives data, pick-up transducers data etc. according to data type.
Claims (2)
1. polyvinylidene fluoride area monitoring wireless senser, it is characterized in that: it comprises the polyvinylidene fluoride piezoelectric membrane, by microprocessor, crystal oscillating circuit, the microprocessing unit module that A/D modulation circuit and filtering circuit are formed, and radio receiving transmitting module, the polyvinylidene fluoride piezoelectric membrane is installed in by on the geodesic structure, microprocessing unit module and radio receiving transmitting module are arranged in the same housing and a shared power supply, the microprocessing unit module, radio receiving transmitting module and power supply adopt the up-down structure layered arrangement in housing, the UART mouth of microprocessor links to each other with radio receiving transmitting module, is connected with the lead that can import the microprocessing unit module on the polyvinylidene fluoride piezoelectric membrane.
2. polyvinylidene fluoride according to claim 1 area monitoring wireless senser is characterized in that: be provided with charge amplifier between polyvinylidene fluoride piezoelectric membrane and microprocessing unit module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410013660 CN1680815B (en) | 2004-04-06 | 2004-04-06 | Local monitoring wireless sensor of vinylidene difluoride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410013660 CN1680815B (en) | 2004-04-06 | 2004-04-06 | Local monitoring wireless sensor of vinylidene difluoride |
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| Publication Number | Publication Date |
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| CN1680815A CN1680815A (en) | 2005-10-12 |
| CN1680815B true CN1680815B (en) | 2010-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410013660 Expired - Fee Related CN1680815B (en) | 2004-04-06 | 2004-04-06 | Local monitoring wireless sensor of vinylidene difluoride |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105973139A (en) * | 2016-04-29 | 2016-09-28 | 安徽国祯环保节能科技股份有限公司 | Piezoelectric film sensor-based manhole cover deformation monitoring system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6014896A (en) * | 1994-08-31 | 2000-01-18 | Honeywell Inc. | Remote self-powered structure monitor |
| US6370964B1 (en) * | 1998-11-23 | 2002-04-16 | The Board Of Trustees Of The Leland Stanford Junior University | Diagnostic layer and methods for detecting structural integrity of composite and metallic materials |
| US6690182B2 (en) * | 2000-07-19 | 2004-02-10 | Virginia Technologies, Inc | Embeddable corrosion monitoring-instrument for steel reinforced structures |
-
2004
- 2004-04-06 CN CN 200410013660 patent/CN1680815B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6014896A (en) * | 1994-08-31 | 2000-01-18 | Honeywell Inc. | Remote self-powered structure monitor |
| US6370964B1 (en) * | 1998-11-23 | 2002-04-16 | The Board Of Trustees Of The Leland Stanford Junior University | Diagnostic layer and methods for detecting structural integrity of composite and metallic materials |
| US6690182B2 (en) * | 2000-07-19 | 2004-02-10 | Virginia Technologies, Inc | Embeddable corrosion monitoring-instrument for steel reinforced structures |
Non-Patent Citations (4)
| Title |
|---|
| W. H. Liao, D. H. Wang, S. L. Huang.Wireless Monitoring of Cable Tension of Cable-StayedBredges Using PVDF Piezoelectric Films.Journal of Intelligent Material Systems and Structures12 5.2001,12(5),331-339. * |
| W.H.Liao D. H. Wang |
| 孙明清,李卓球,候作富.压电材料在土木工程结构健康检测中的应用.混凝土2003 3.2003,2003(3),22-24. |
| 孙明清,李卓球,候作富.压电材料在土木工程结构健康检测中的应用.混凝土2003 3.2003,2003(3),22-24. * |
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| CN1680815A (en) | 2005-10-12 |
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