CN202916004U - Piezoresistive/piezoelectric composite sensor and monitoring system based on the same - Google Patents
Piezoresistive/piezoelectric composite sensor and monitoring system based on the same Download PDFInfo
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- CN202916004U CN202916004U CN 201220557156 CN201220557156U CN202916004U CN 202916004 U CN202916004 U CN 202916004U CN 201220557156 CN201220557156 CN 201220557156 CN 201220557156 U CN201220557156 U CN 201220557156U CN 202916004 U CN202916004 U CN 202916004U
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Abstract
The utility model discloses a piezoresistive/piezoelectric composite sensor and a monitoring system based on the same, and relates to a self-powered piezoresistive/piezoelectric composite sensor used in traffic and structure parameter synchronous monitoring sensors. The piezoresistive/piezoelectric composite sensor of the utility model comprises a piezoresistive/piezoelectric composite material layer, the upper surface and the lower surface of the piezoresistive/piezoelectric composite material layer are provided with an electrode respectively, the piezoresistive/piezoelectric composite material layer and the electrodes are all packaged in a packaging housing, and the upper electrode and the lower electrode are connected through an electromagnetic shielding wire which runs through the packaging housing. The monitoring system of the utility model comprises a sensor, a dynamic signal acquisition system, a static signal acquisition system, and an energy harvesting/discharging control system. The sensor electromagnetic shielding wire is electrically connected with the dynamic signal acquisition system, the static signal acquisition system and the energy harvesting/discharging control system separately. According to the utility model, advantages of good interface and impedance matching performance, high frequency response and good durability can be realized. Moreover, the static/dynamic traffic and structure parameter synchronous monitoring ability covering the whole frequency domain can be realized.
Description
Technical field
The utility model relates to the self energizing pressure drag that the Simultaneous Monitoring sensor of a kind of traffic and structural parameters uses/piezoelectricity combined type trans and based on (self energizing) monitoring system of this sensor network.
Background technology
In recent years, along with the fast development of national economy, China's vehicle population rapid growth, highway, mistake river (over strait) bridge, overhead road of city/viaduct are constantly built.In case these transport structure accidents or structure are caved in, easily cause whole traffic system to be blocked up and casualties, and be difficult in a short time repair, cause the significant decline of traffic transport power, its loss is inestimable.Thereby, the transport structure of these hub region and key road segment is carried out traffic control and monitoring structural health conditions seem particularly necessary.Meanwhile, these transport structures (especially structures to form seam place) often are in micro breadth oscillation under Driving Loading, if corresponding mechanical vibrational energy can effectively be collected, and supply with to corresponding sensor monitoring network even two-side lighting system, significant in the current energy-conserving and environment-protective epoch.
Obtained significant progress in decades in the past as all kinds of cement based sensors good with transport structure acoustic impedance and matching compatibility, close service life, can say, the success of various transport structure monitoring systems is largely given the credit to these intelligence sensors accurate and stable bridge traffic and structured data is provided, such as accurate rate signal, trigger the information such as classified information, power performance, displacement deformation and long-term feedback transport information statistics etc.Be the technology of ZL02132967.2 such as China Patent No., the resistance pressure type sensor that the piezoresistive effect that utilizes the electric property of the cement matrix material of all kinds of conducting function components of admixture (carbon black, nickel powder, carbon fiber, carbon nano-tube etc.) to change with external load/distortion forms is responsive to (standard) stationary singnal, and insensitive to the dynamic vibration signal, sensing accuracy is low.Be the technology of ZL201010523624.3 such as China Patent No., utilize cement matrix material or the direct electric density that encapsulates the bulk electrode two ends of PZT thin slice with resin concrete of the fine piezoelectric ceramics of admixture (PZT) powder to change the piezo-type sensor of (contrary) piezoelectric effect formation along with external load/distortion variation mainly to dynamic vibration signal sensitivity, insensitive to (standard) stationary singnal, exist intrinsic structure toughness lower, be vulnerable to the defectives such as impact of the physical environments such as concrete road surface shrinkage cracking, subgrade settlement.Simultaneously, do not relate to the inverse piezoelectric effect of utilizing corresponding piezo-type sensor to effective collection, storage and the various circuit energy supplying system of driving mechanical vibrational energy yet.Meanwhile, tradition embeds or is pasted on the monitoring system of bridge structure sensor or is the monitoring system of monitoring (standard) static stress/strain structure parameter, or is the monitoring system of Dynamic Traffic Flow parameter.
The utility model content
Technique effect of the present utility model can overcome defects, and a kind of pressure drag/piezoelectricity combined type trans is provided, and it is perceptual structure parameter and Dynamic Traffic Flow parameter synchronously.
For achieving the above object, pressure drag in the utility model/piezoelectricity combined type trans adopts following technical scheme: it comprises pressure drag/piezo-electricity composite material layer, the upper and lower surface of pressure drag/piezo-electricity composite material layer respectively arranges an electrode, pressure drag/piezo-electricity composite material layer and electrode all are wrapped in the package casing, link to each other by the electromagnetic screen wire that runs through package casing between two electrodes up and down.
This pressure drag/piezoelectricity combined type trans combines (standard) static pressure inhibition effect and dynamic piezoelectric effect, and it is toughness reinforcing to be aided with toughness fiber, and then provide a kind of and guaranteeing outside the characteristics such as, service life good with the xoncrete structure compatibility be long, have simultaneously intrinsic structure toughness high, contain full frequency-domain quiet/the polynary performances such as dynamic traffic structure monitoring and vibration self energizing are in one.
Electrode arrangement mode is all standing formula or grating type or interdigital form or the grid formula of intersecting.Electrode adopts conductive silver glue electrode or silver electrode or nickel electrode.
Package casing is a kind of fibre reinforced resin concrete that is mixed by the weight ratio of 1:0.1-0.3:0.4-0.8:0.4-0.6:0.01-0.1 by cement, flyash, water-base resin, waterborne curing agent, toughness fiber.
Pressure drag/piezo-electricity composite material layer (1) comprises following component by weight ratio: 100 parts of cement, 105-500 part micro/nano level piezoelectric ceramic powder, 10-30 part flyash, 15-50 part water, 0.01-2 part super plasticizer, 0.1-10 part toughness fiber, 0.01-15 part conductive filler.
Above-mentioned pressure drag/piezoelectricity sensing element utilizes fibre reinforced resin concrete to be packaged into the preparation method of pressure drag/piezoelectricity combined type trans, may further comprise the steps: proportionally first toughness fiber is dispersed in the water-base resin by high-speed stirred, then add corresponding hardening agent mixing, add again cement and flyash dry mix, stir; Pressure drag/piezoelectricity sensing element is fixed on (upper/lower electrode is drawn by the electromagnetic screen wire in the mould, and connect shielded joint), then above-mentioned fibre reinforced resin concrete potpourri is poured in the mould, before cement final set, mould moved to vacuumize de-bubble (with density and the insulating property of further raising encapsulating material) in the vacuum drying chamber; Last use resin and corresponding hardening agent mixed diluting liquid surface coverage maintenance to the 28 day length of time, namely get pressure drag of the present utility model/piezoelectricity combined type trans.The large I of sensor is adjusted according to the actual requirements.
In above-mentioned pressure drag/piezoelectricity combined type trans, described cement is portland cement, a kind of in Portland cement, the sulphate aluminium cement.
In above-mentioned pressure drag/piezoelectricity combined type trans, described flyash is " flyash that is used for cement and concrete " (GB/T1596-2005) I level flyash of middle regulation.
In above-mentioned pressure drag/piezoelectricity combined type trans, described water is a kind of in commercially available distilled water, the deionized water.
In above-mentioned pressure drag/piezoelectricity combined type trans, described super plasticizer is the one or more combination in polycarboxylate high-efficiency water-reducing agent, aliphatic high-efficiency water reducing agent, Amino-sulfonic Acid-based Water-reducer, melamine resin series high-efficiency water-reducing agent, the naphthalene series high-efficiency water-reducing agent.
In above-mentioned pressure drag/piezoelectricity combined type trans, described toughness fiber is a kind of in vinal, mekralon, the polyimide fiber.
In above-mentioned pressure drag/piezoelectricity combined type trans, described conductive filler is a kind of in micro/nano level carbon black, micro/nano level nickel powder, carbon fiber, carbon nano-fiber, carbon nano-tube, Graphene, graphene oxide grafting carbon fiber, the graphene oxide grafting carbon nano-fiber or wherein several mixing.
In above-mentioned pressure drag/piezoelectricity combined type trans, described water-base resin is a kind of in aqueous epoxy resins, resol resins, water-based Lauxite, water-based melamine-formaldehyde resin, waterborne polyurethane resin, the water-soluble poly imide resin; Described waterborne curing agent is special curing agent corresponding to each water-base resin.
Another purpose of the present utility model provides a kind of monitoring system based on the sensor, it comprises sensor, dynamic signal acquisition system, stationary singnal acquisition system, prisoner's energy/discharge control system, and sensor electrical magnetic shielding wire is electrically connected with dynamic signal acquisition system, stationary singnal acquisition system, prisoner's energy/discharge control system respectively.
Power supply in the above-mentioned acquisition system can will be when the Traffic monitoring intermittent phase, vehicle rolled the sensor transform under inverse piezoelectric effect by prisoner's energy/charge/discharge control circuit well known to those skilled in the art, and the moment electric energy and back feeding that effectively stores, the self energizing of realization monitoring system.
The dynamic signal acquisition system comprises power supply, prime amplifier, A/D analog to digital converter, collection/memory module, main frame, FLASH module, RAM module, power supply is connected with prisoner's energy/discharge control system, prime amplifier is connected with sensor, and power supply, prime amplifier, A/D analog to digital converter, main frame, FLASH module, RAM module are connected with collection/memory module respectively.The stationary singnal acquisition system comprises Wheatstone bridge, and Wheatstone bridge is connected with the RC discharge circuit, and two brachium pontis of Wheatstone bridge are connected with sensor respectively.Prisoner's energy/discharge control system comprises interconnective rectifier bridge and RC discharge circuit, and rectifier bridge is connected with sensor, and the RC discharge circuit is connected with power supply.
After (self energizing) monitoring system based on pressure drag/piezoelectricity combined type trans network of the present utility model embeds or pastes in the transport structure system, interface and impedance matching are good, frequency response is high except having, permanance high, also have better intrinsic structure toughness and contain full frequency-domain quiet/the Simultaneous Monitoring ability of dynamic traffic and structural parameters, and can realize effective collection, storage and the various circuit energy supply of driving mechanical vibrational energy.Therefore, this pressure drag/piezoelectricity combined type trans and have a good application prospect based on (self energizing) monitoring system of this sensor network.
Description of drawings
Fig. 1 is the utility model system embodiment 1 structural representation;
Fig. 2 is sensor partial enlarged drawing of the present utility model.
Fig. 3 is the utility model system embodiment 2 structural representations.
Among the figure: 1. pressure drag/piezo-electricity composite material layer; 2. electrode; 3. package casing; 4. electromagnetic screen wire; 5. bridge floor unit; 6. bearing; 7. dynamic signal acquisition system; 8. stationary singnal acquisition system; 9. capture energy/discharge control system.
Embodiment
As shown in Figure 1 and Figure 2, pressure drag of the present utility model/piezoelectricity combined type trans, comprise pressure drag/piezo-electricity composite material layer 1, the upper and lower surface of pressure drag/piezo-electricity composite material layer 1 arranges pair of electrodes 2, pressure drag/piezo-electricity composite material layer 1 and electrode 2 all are wrapped in the package casing 3, link to each other by the electromagnetic screen wire 4 that runs through package casing between two electrodes up and down.Electrode arrangement mode is grating type, and electrode 2 adopts the conductive silver glue electrode.
Monitoring system based on the sensor, comprise sensor, dynamic signal acquisition system 7, stationary singnal acquisition system 8, prisoner's energy/discharge control system 9, sensor electrical magnetic shielding wire 4 is electrically connected with dynamic signal acquisition system 7, stationary singnal acquisition system 8, prisoner's energy/discharge control system 9 respectively.
Sensor setting is between bridge floor unit 5 and bearing 6.
Dynamic signal acquisition system 7 comprises power supply, prime amplifier, A/D analog to digital converter, collection/memory module, main frame, FLASH module, RAM module, power supply is connected with prisoner's energy/discharge control system 9, prime amplifier is connected with sensor, and power supply, prime amplifier, A/D analog to digital converter, main frame, FLASH module, RAM module are connected with collection/memory module respectively.Prisoner's energy/discharge control system 9 comprises interconnective rectifier bridge and RC discharge circuit, and rectifier bridge is connected with sensor, and the RC discharge circuit is connected with power supply.Stationary singnal acquisition system 8 comprises Wheatstone bridge, and Wheatstone bridge is connected with the RC discharge circuit, and two brachium pontis of Wheatstone bridge are connected with sensor respectively.
In traffic engineering structural load frequency (0.1-50Hz) scope, for Loading frequency less than 1Hz's, generally can think static or quasi-static load, such as expressway access charge station, weighbridge, parking area monitoring etc., at this moment by uneven output voltage (the Δ U on the Wheatstone bridge in (standard) stationary singnal acquisition system 8 of test lead connection
12) (as shown in Figure 1), acquisition has the electricity of the pressure drag of similar resistance/piezoelectricity combined type trans and leads characteristic change parameter, the noise signal rejecting technology that causes by environmental factor well-known to those skilled in the art more just can realize the accurate extraction of corresponding quasistatic traffic and structural parameters; And for the dynamic loads (comprise loop cycle, pulse, random load form) of frequency greater than 1Hz, such as highway, the structural stress of striding vehicle identification, the speed of a motor vehicle, vehicle flowrate and the corresponding generation of fast running vehicle on the bridge of river (sea), the detection of distortion etc.In order effectively to measure the faint quantity of electric charge that pressure drag/piezoelectricity combined type trans piezoelectric effect produces, and prevent charge leakage, at this moment can be connected to preposition charge/voltage amplifier and combination A/D analog to digital converter by shielded joint, bandpass filter, the 7(of dynamic signal acquisition system of the single-chip microcomputer such as voltage amplifier and storage/display as shown in Figure 1), test the piezoelectric parameter situation of change to the Dynamic Signal sensitivity of pressure drag of the present utility model/piezoelectricity combined type trans, realize again the accurate extraction of corresponding dynamic sensing signal by sensing well-known to those skilled in the art and noise signal rejecting technology.
Power supply in the above-mentioned acquisition system can will be when the Traffic monitoring intermittent phase, vehicle rolled the sensor transform under inverse piezoelectric effect and then effectively store by prisoner's energy/charge/discharge control circuit 9 moment electric energy and back feeding, the self energizing of realization monitoring system.
The utility model also provides this pressure drag/piezoelectricity combined type trans network and based on the application of the monitoring system of this sensor: installation position, mode and quantity.Concrete grammar is: calculate vehicle number with the peak value number in pressure drag/piezoelectricity combined type trans Dynamic Signal, calculate car weight/vehicle with the response sum of sensor, and calculate the speed of a motor vehicle with the mistiming of the parallel sensor response of the twice that keep at a certain distance away; Load front and back amplitude size divided by the area calculated stress with sensor (standard) stationary singnal, calculate pressure (drawing) strain with (bearing) amplitude divided by elastic modulus, characterize corresponding construction when surpassing concrete anti-compression (tension) the intensity limit with sensor response (bearing) amplitude and occur to damage or the crack.And then realize under the exposed environments at traffic parameter (such as vehicle flowrate, the speed of a motor vehicle, vehicle and car weight etc.) and structural parameters under the different traffics, under the different driving load form (axial stress, draw/compressive strain, bending strain, crack and damage etc.) in real time detection and lesion assessment.
As shown in Figure 3, pressure drag of the present utility model/piezoelectricity combined type trans also can be embedded in the inside (being that sensor embeds in the bridge floor unit 5) of reinforced beam fully, in order to measure more accurately the speed of a motor vehicle of car.
The other the same as in Example 1.
Claims (7)
1. pressure drag/piezoelectricity combined type trans, it is characterized in that, comprise pressure drag/piezo-electricity composite material layer (1), the upper and lower surface of pressure drag/piezo-electricity composite material layer (1) respectively arranges an electrode (2), pressure drag/piezo-electricity composite material layer (1) and electrode (2) all are wrapped in the package casing (3), link to each other by the electromagnetic screen wire (4) that runs through package casing between two electrodes up and down.
2. sensor according to claim 1 is characterized in that, electrode arrangement mode is all standing formula or grating type or interdigital form or the grid formula of intersecting.
3. sensor according to claim 1 is characterized in that, electrode (2) adopts conductive silver glue electrode or silver electrode or nickel electrode.
4. monitoring system based on the described sensor of claim 1, it is characterized in that, comprise sensor, dynamic signal acquisition system (7), stationary singnal acquisition system (8), prisoner's energy/discharge control system (9), sensor electrical magnetic shielding wire (4) is electrically connected with dynamic signal acquisition system (7), stationary singnal acquisition system (8), prisoner's energy/discharge control system (9) respectively.
5. monitoring system according to claim 4, it is characterized in that, dynamic signal acquisition system (7) comprises power supply, prime amplifier, A/D analog to digital converter, collection/memory module, main frame, FLASH module, RAM module, power supply is connected with prisoner's energy/discharge control system (9), prime amplifier is connected with sensor, and power supply, prime amplifier, A/D analog to digital converter, main frame, FLASH module, RAM module are connected with collection/memory module respectively.
6. monitoring system according to claim 5 is characterized in that, prisoner's energy/discharge control system (9) comprises interconnective rectifier bridge and RC discharge circuit, and rectifier bridge is connected with sensor, and the RC discharge circuit is connected with power supply.
7. monitoring system according to claim 6 is characterized in that, stationary singnal acquisition system (8) comprises Wheatstone bridge, and Wheatstone bridge is connected with the RC discharge circuit, and two brachium pontis of Wheatstone bridge are connected with sensor respectively.
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| CN 201220557156 CN202916004U (en) | 2012-10-26 | 2012-10-26 | Piezoresistive/piezoelectric composite sensor and monitoring system based on the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104457964A (en) * | 2014-11-28 | 2015-03-25 | 西安交通大学 | Double-axis vibrating sensor based on flexoelectric principle |
| CN105973455A (en) * | 2016-06-27 | 2016-09-28 | 北京空间飞行器总体设计部 | Combined piezoelectric strain vibration measurement device |
| CN109406013A (en) * | 2018-12-06 | 2019-03-01 | 中国科学院深圳先进技术研究院 | A kind of preparation method of sensor and sensor |
| CN111721630A (en) * | 2020-07-08 | 2020-09-29 | 中建四局第三建设有限公司 | Piezoelectric solidified soil for in-situ detection of sludge solidification and preparation method thereof |
| CN112284577A (en) * | 2020-09-27 | 2021-01-29 | 西安交通大学 | Piezoelectric piezoresistive combined type touch sensor and preparation method thereof |
| CN112747843A (en) * | 2020-11-30 | 2021-05-04 | 华中科技大学 | Bridge monitoring method and device based on flexible piezoelectric sensor |
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- 2012-10-26 CN CN 201220557156 patent/CN202916004U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104457964A (en) * | 2014-11-28 | 2015-03-25 | 西安交通大学 | Double-axis vibrating sensor based on flexoelectric principle |
| CN105973455A (en) * | 2016-06-27 | 2016-09-28 | 北京空间飞行器总体设计部 | Combined piezoelectric strain vibration measurement device |
| CN109406013A (en) * | 2018-12-06 | 2019-03-01 | 中国科学院深圳先进技术研究院 | A kind of preparation method of sensor and sensor |
| CN109406013B (en) * | 2018-12-06 | 2024-04-09 | 中国科学院深圳先进技术研究院 | Sensor and preparation method thereof |
| CN111721630A (en) * | 2020-07-08 | 2020-09-29 | 中建四局第三建设有限公司 | Piezoelectric solidified soil for in-situ detection of sludge solidification and preparation method thereof |
| CN111721630B (en) * | 2020-07-08 | 2022-07-08 | 中建四局第三建设有限公司 | Piezoelectric solidified soil for in-situ detection of sludge solidification and preparation method thereof |
| CN114052717A (en) * | 2020-07-30 | 2022-02-18 | 昆山微电子技术研究院 | Biological gait feature recognition device |
| CN112284577A (en) * | 2020-09-27 | 2021-01-29 | 西安交通大学 | Piezoelectric piezoresistive combined type touch sensor and preparation method thereof |
| CN112747843A (en) * | 2020-11-30 | 2021-05-04 | 华中科技大学 | Bridge monitoring method and device based on flexible piezoelectric sensor |
| CN113075726A (en) * | 2021-05-10 | 2021-07-06 | 联合微电子中心有限责任公司 | Hydrophone and method for manufacturing same |
| WO2022237301A1 (en) * | 2021-05-10 | 2022-11-17 | 联合微电子中心有限责任公司 | Hydrophone and manufacturing method therefor |
| CN114323365A (en) * | 2021-12-21 | 2022-04-12 | 青岛理工大学 | Static and dynamic three-dimensional micro-crack expansion sensor, and preparation method and equipment thereof |
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Granted publication date: 20130501 Termination date: 20131026 |