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Passive wireless surface acoustic wave stress sensor adopting three-layer stress transferring model

A stress sensor, surface acoustic wave technology, applied in the direction of force measurement by measuring the frequency change of a stressed vibrating element

Inactive Publication Date: 2011-09-07
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The three-layer stress transfer model involved solves the basic problem of stress transfer when the surface acoustic wave stress sensor is used, and provides a new way of thinking for the sensor mounting and packaging design

Method used

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  • Passive wireless surface acoustic wave stress sensor adopting three-layer stress transferring model
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  • Passive wireless surface acoustic wave stress sensor adopting three-layer stress transferring model

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Embodiment Construction

[0020] The specific embodiment of the present invention is described in detail below:

[0021] figure 1 In the present invention, the surface acoustic wave resonator 1 is pasted on the surface of the subject material 3 to be tested through an epoxy adhesive 2 . Under the action of external force, the two ends of the main structure material 3 bear the tensile force, while the two ends and the free surface of the sensor layer 1 and the adhesive layer 2 have no external stress. The two ends of the sensor layer 1 and the adhesive layer 2 are not stressed, but the shear stress at the interface between the three layers transfers the axial stress of the structural material layer 3 to the adhesive layer 2 and the sensor layer 1, so that the SAW resonator also bears Axial stress.

[0022] Reflecting the problem of strain transfer in the structure, a three-layer model can be established and the mechanism of strain transfer can be analyzed using the shear hysteresis theory, which are: ...

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Abstract

The invention relates to a surface wave stress sensor based on a three-layer stress transferring model. The surface acoustic wave stress sensor provided by the invention comprises a piezoelectric substrate material, an interdigital transducer, a reverse grid, a small antenna and an adhesive agent used for sticking the sensor, wherein a surface acoustic wave resonator is adhered to a detected object by the adhesive agent. Different from the traditional surface acoustic wave stress sensor, a three-layer mechanical model, namely a detected structure substrate, an adhesive layer, an SAW (surface acoustic wave) resonance layer of the surface acoustic wave stress sensor, is established, a stress transferring formula and a stress transferring coefficient of the SAW sensor are deduced and the factors influencing the SAW sensor measuring result are achieved. The main factors influencing the sensor stress transferring contain the length of the sensor, the thickness of the adhesive layer, the modulus of elasticity, the thickness of an SAW quartz substrate, and the like. The thinner the adhesive layer is, the longer the SAW resonator is and the larger the modulus of elasticity of the material is, the better the detecting precision of the stress sensor is. The surface acoustic wave stress sensor is simple in structure, small in volume, light in weight, convenient to use and suitable for stress wireless remote monitoring under severe environment.

Description

1. Technical field [0001] The invention relates to a surface wave stress sensor based on a three-layer stress transfer model. This sensor can realize passive wireless, has the advantages of small size, light weight, and convenient use. It is especially suitable for occasions where it is difficult to measure stress such as radiation, high temperature, small space, and movement. It can be widely used in aviation, aerospace, weapons, and automobiles. , medical, consumer electronics and other fields. 2. Background technology [0002] The stress sensor based on surface acoustic technology is the result of the combination of electronics, acoustics, microelectronics and antenna technology. Compared with other sensors, the surface acoustic wave gas sensor has many excellent characteristics, such as adapting to harsh environments, wireless passive, volume It has the advantages of small size, light weight, high precision, strong anti-interference ability, mass production, and low cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/10
Inventor 徐春广周世圆张运涛刘婧肖定国赵新玉郝娟孟凡武潘勤学
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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