CN101738274B - Area array dynamic stress sensor and testing method thereof - Google Patents
Area array dynamic stress sensor and testing method thereof Download PDFInfo
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- CN101738274B CN101738274B CN200810175843XA CN200810175843A CN101738274B CN 101738274 B CN101738274 B CN 101738274B CN 200810175843X A CN200810175843X A CN 200810175843XA CN 200810175843 A CN200810175843 A CN 200810175843A CN 101738274 B CN101738274 B CN 101738274B
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Abstract
The invention relates to a sensor device and a method thereof used for testing the dynamic stress of an area array. The area array piezoelectric sensor adopts the structure that a plurality of individual piezoelectric pressure sensors are stuck to a flexible attached board, the minimum interval thereof is equal to the size of the sensor, and a conducting wire of each sensor is intensively connected to a wire connecting terminal. The sensor comprises a metallic protective layer, a rubber encapsulated layer, a piezoelectric film, an electrode adapter and a miniature charge amplifier. Each sensor is provided with one miniature charge amplifier and one resistor, a power input port and a signal output port are respectively connected with an amplifier, and the ground electrode of the sensor is connected with the ground electrode of a power supply. The sensor device comprises the area array piezoelectric sensor, the wire connecting terminal and an acquisition card, and the acquisition card is connected to a computer for data acquisition. The equivalent modulus and the stability of dynamic property of the pressure sensor are obviously improved, the distribution of roadbed dynamic stress of an entire section can be accurately and simply tested, and the sensor device and the method thereof can be used for testing the dynamic stress of an earth roadbed in the fields of railways, public roads, airports, and the like.
Description
Technical field
The invention belongs to the Geotechnical Engineering sensor technical field, be specifically related to a kind of sensor device and method thereof that is used for the test surfaces array dynamic stress.
Background technology
Current China builds the traffic infrastructures such as high-speed railway, highway and airport that high standard requires in a large number, for guaranteeing that facility has good stable and permanance, substructure is all proposed very high requirement, comprised transient state kinematic behavior and long-time stability etc.Soil subgrade is as the important component part of substructure, when bearing superstructure dead load, also to bear the dynamic load effect that top movable body (train, automobile and aircraft etc.) high-speed cruising produces, along with the progressively raising of construction criteria, the dynamics research of soil subgrade is more and more important.The loading condition of roadbed and dynamic response are reasonable selection of design parameters and the basis of estimating the roadbed situation, and the dynamic response of roadbed especially Study on dynamic stress is extremely important, and reliable and effective sensor and method of testing are the bases of research.When hot-short moves, not only relate to the dynamic stress of roadbed, all need at aspects such as barricade, tunnel-liner, bridge pads to pay close attention to, and the more important thing is and need study the dynamic stress characteristic of these structures along whole cross section.Therefore, area array dynamic stress sensor and method of testing thereof all have important meaning and using value at aspects such as railway, highway and airports.
In ground media such as roadbed, test free field stress, need touch sensor is embedded in the medium,, determine the true stress of medium by the electric signal of sensor impression.At present, the sensor that generally uses in the roadbed ambulatory stress test is a resistance strain type sensor, and the resistance strain type sensor that is embedded in roadbed is drawn signal wire and tested by strainmeter.Known resistance strain type sensor is made up of metal case, lid, the flexible sheet that is provided with resistance strain gage, connecting line and loading plate etc.Because the physics of sensor and mechanical property and rock soil medium are inequality, certainly will produce " matching error " problem, it is proposed rigidity and form fit requirement, promptly need the whole equivalent elastic modulus of bigger sensor and the ratio (being good generally) of subgrade modulus and less sensor depth-width ratio (it is good being generally less than 0.2) greater than 10.The sensor depth-width ratio requires to be easy to relatively reach in design, and along with the raising of infrastructure construction standard, the roadbed mechanical index requires progressively to improve, met or exceeded the equivalent elastic modulus of sensor when elastic modulus, in test process, cause very important error, just no longer be adapted at the test of roadbed dynamic stress under the high standard condition.
China No. 03212896.7 patent disclosure a kind of " resistance-strain pressing shaft type soil pressure cell ", the equivalent elastic modulus of this soil pressure cell of test shows can't be used in the soil subgrade under the high standard condition less than on-the-spot subgrade modulus.This in addition sensor belongs to single-spot testing, if seek out the stress in whole cross section, need bury a plurality of resistance strain type sensors underground, for reducing influencing each other between the sensor, soil pressure cell for diameter 18cm, height 3cm, its horizontal clear distance generally should not be less than 2 times of sensor diameters, and this can not carry out comprehensive and complete test by pair cross-section stress with regard to causing.
China's 200710069421.X patent disclosure a kind of " array piezoelectric sensor ", this sensor adopts the PVDF sheet as the piezoelectric sensitivity layer, the method test contact pressure of utilizing piezoelectric principle and integrated circuit to combine.But its electric charge amplification method, method of testing and suitable application area and the difference that all has essence of the present invention, it is that electric charge is read integrated circuit with the CCD integrated circuit, mainly is applicable to aspects such as ergonomics, tactile sensing device of robot and medical treatment.
China No. 200710020948.3 patent disclosure a kind of " laser sonic surface wave stress test system ", this test system utilizes short-pulse laser to produce the high frequency ultrasound surface wave on the sample surface, with the receiving trap of PVDF piezoelectric film as ultrasonic surface wave, obtain stress value according to the acoustic elasticity principle, although this system can carry out the measurement of the stress distribution of sample surfaces, only be applicable to the stress test of metal material surface.
Summary of the invention
Purpose of the present invention is exactly the deficiency at existing Geotechnical Engineering measuring technology, provides that a kind of concrete moduli is big, Hz-KHz is wide, anti-overload, simple in structure, corrosion resistant area array dynamic stress piezoelectric sensor and corresponding test method thereof.
The present invention includes face battle array piezoelectric sensor, connection terminal and capture card.Face battle array piezoelectric sensor is sticked on the flexible lamina affixa by several independent piezoelectric stress sensors, quantity and arrangement mode are according to content measurement and require definite, the minimum spacing of piezoelectric stress sensor is the size dimension of sensor, is connected to connection terminal in the line set of each piezoelectric stress sensor.Capture card is based on the terminal that the amplification result of face battle array piezoelectric sensor carries out data acquisition.The piezoelectric stress sensor comprises coat of metal, rubber encapsulated layer, piezoelectric film, electrode adapter and miniature charge amplifier.Each piezoelectric stress sensor is provided with a miniature charge amplifier and a resistance, and the power input mouth is connected with amplifier respectively with signal output port, and the ground electrode of sensor is connected with the power supply ground electrode, can shared earth polar.Capture card inserts computer and carries out data acquisition.
Described coat of metal is that thickness is the stainless steel substrates of 0.5～1.0mm, and size is identical with the piezoelectric film size, sticks on the rubber encapsulated layer.
Described rubber encapsulated layer is that thickness is the sheet rubber of 0.5～1.0mm, and is more bigger than piezoelectric film, by two-layer encapsulated layer up and down piezoelectric film insulated.
Described electrode adapter is a circular metal joint, and diameter is 4～6mm, in order to connect lead and piezoelectric film.
Described miniature charge amplifier is a kind of device that the piezoelectric voltage of piezoelectric film is amplified, and each piezoelectric film is all established a charge amplifier.
Described piezoelectric film comprises PVDF (polyvinylidene fluoride) sheet, has that frequency response is wide, dynamic range is big, the electric converting sensitivity height of power, its thickness 30～500 μ m, and rectangle, length are 1～5cm, wide is 1～2cm.Upper and lower surface at the PVDF sheet connects two leads formation the two poles of the earth by riveted joint of electrode adapter or bonding method, wherein inserts the very anodal of positive source, inserts the very earth polar in earth polar.The wiring of each piezoelectric film is identical.
Described connection terminal is the binding post of whole battle array piezoelectric sensor, and number of terminals is identical with the quantity of actual piezoelectric stress sensor.
Described capture card is the A/D collector, is a kind of usb bus data acquisition product, the data acquisition measuring system that can connect and compose with various desk-top computers, notebook machine and the industrial computer of band USB interface.Acquisition channel is generally 16 or 32 passages.
Of the present invention battle array piezoelectric sensor is to be made up of through the piezoelectric stress sensor that electric charge amplifies several according to the test needs, has characteristics such as volume is little, integrated level is high, distribution density is big.Not only frequency response is wide, dynamic range is big, concrete moduli is high for this sensor, can carry out full test to whole cross section, and has stable dynamic property and antijamming capability.
Described flexible lamina affixa is flexible geotextile, has flexibility, anti-performance such as draw, and thickness 3～5mm is used for the location of piezoelectric sensor at test position.
After each piezoelectric stress sensor of the present invention amplifies through miniature charge amplifier, gather through connection terminal, carry out data acquisition as terminal by various desk-top computers, notebook and industrial computer etc. by capture card, obviously improved the concrete moduli and the dynamic property stability of strain gauge, the roadbed dynamic stress that can accurately test whole cross section distributes.Not only realize the miniaturization of sensor and integrated, and realized the easy test of complex distributions stress, can be used for testing the soil subgrade dynamic stress in fields such as railway, highway, airport.
Description of drawings
The following drawings only is intended to the present invention done and schematically illustrates and explain, not delimit the scope of the invention.Wherein,
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structural representation of piezoelectric stress sensor among Fig. 1;
Fig. 3 is the structural representation of Fig. 1 middle connecting terminal;
Embodiment
Understand for technical characterictic of the present invention, purpose and effect are had more clearly, now contrast description of drawings the specific embodiment of the present invention.
As shown in Figure 1, the area array dynamic stress sensor that the present invention proposes is arranged by some piezoelectric stress sensors 1 and is formed, and stick on the flexible lamina affixa 2, and the signal wire 3 of each piezoelectric stress sensor 1 is connected to connection terminal 5 respectively, ground wire 4 unified the concentrating of piezoelectric stress sensor 1 are connected to connection terminal 5, and carry out data acquisition by capture card 6 by computing machine.The ranks number and the ranks spacing of piezoelectric stress sensor can design according to actual needs.
The structure of piezoelectric stress sensor 1 is referring to Fig. 1 and Fig. 2; include coat of metal 9, rubber encapsulated layer 8, piezoelectric film 7, electrode adapter 10, miniature charge amplifier 11 and resistance 12; and by positive source 13 input voltages, signal wire 3 picks out between amplifier 11 and resistance 12.
The structure of connection terminal 3 comprises wiring pillar 14 and plastic feet 15 referring to Fig. 1 and Fig. 3, and signal wire 3 and earth polar 4 are connected to wiring pillar 14, and leads to total joint 16.
When piezoelectric stress sensor vertical direction pressurized, piezoelectric film produces pressure and produces electric charge, carries out electric charge through miniature amplifier and amplifies, and the piezoelectric film pressurized is converted to corresponding charge signal, and be transferred to capture card by signal wire and connection terminal, gather by computing machine.According to the test needs, quantity, ranks number and the spacing of piezoelectric stress sensor designed, and then can obtain the area array dynamic stress in whole cross section.
Claims (1)
1. face battle array piezoelectric sensor, it is characterized in that: face battle array piezoelectric sensor is sticked on the flexible lamina affixa by several independent piezoelectric stress sensors, quantity and arrangement mode are according to content measurement and require definite, the minimum spacing of piezoelectric stress sensor is the size dimension of sensor, is connected to connection terminal in the line set of each piezoelectric stress sensor; The piezoelectric stress sensor comprises coat of metal, rubber encapsulated layer, piezoelectric film, electrode adapter and miniature charge amplifier; Each piezoelectric stress sensor is provided with a miniature charge amplifier and a resistance, and the power input mouth is connected with miniature charge amplifier respectively with signal output port, and the ground electrode of sensor is connected with the power supply ground electrode, can shared earth polar.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109405854A (en) * | 2018-10-19 | 2019-03-01 | 吉林大学 | A kind of bionical strain amplification, the programmable sensing device of sensitivity and application |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245444A (en) * | 2012-02-06 | 2013-08-14 | 同济大学 | Measuring system for stress of rock and earth mass |
| CN105092116A (en) * | 2015-08-18 | 2015-11-25 | 吉林大学 | Road load distribution multipoint cascading piezoelectric detection network |
| CN108267246A (en) * | 2017-12-12 | 2018-07-10 | 武汉科技大学 | A kind of dynamic Tai Yu roads ground connection stress measurement device and method |
| CN110243506A (en) * | 2018-03-08 | 2019-09-17 | 中国科学院深圳先进技术研究院 | A kind of piezoresistive pressure sensor and preparation method thereof |
| CN109632157A (en) * | 2018-12-07 | 2019-04-16 | 哈尔滨工程大学 | A kind of bolt joint surface dynamic stress monitoring device |
| CN113267289B (en) * | 2021-04-16 | 2022-08-16 | 上海交通大学 | Array type flexible piezoelectric sensor for aircraft engine and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201051025Y (en) * | 2007-06-19 | 2008-04-23 | 杭州电子科技大学 | An array piezoelectric sensing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201051025Y (en) * | 2007-06-19 | 2008-04-23 | 杭州电子科技大学 | An array piezoelectric sensing device |
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| JP特开2006-184255A 2006.07.13 |
| JP特开2008-224564A 2008.09.25 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109405854A (en) * | 2018-10-19 | 2019-03-01 | 吉林大学 | A kind of bionical strain amplification, the programmable sensing device of sensitivity and application |
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Effective date of registration: 20210111 Address after: 100081 Beijing city Haidian District Daliushu Road No. 2 Patentee after: CHINA ACADEMY OF RAILWAY SCIENCES Corp.,Ltd. Patentee after: CARS RAILWAY ENGINEERING Research Institute Patentee after: BEIJING RAILWAY SCIENCE ENGINEERING INSPECTION CENTER Address before: 100801 Beijing city Haidian District Daliushu Road No. 2 Patentee before: BEIJING RAILWAY SCIENCE ENGINEERING INSPECTION CENTER |