Method using delay line type surface acoustic wave sensor to test characteristic parameters of article

A surface acoustic wave and delay line type technology, which is applied in the field of new sensor testing, can solve the problem that the delay line type surface acoustic wave sensor is not very practical, and achieve the effect of realizing industrial online application, high precision and increasing frequency.

Inactive Publication Date: 2014-02-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] So far, the practical degree of delay line surface acoustic wave sensor is not very high, most

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  • Method using delay line type surface acoustic wave sensor to test characteristic parameters of article
  • Method using delay line type surface acoustic wave sensor to test characteristic parameters of article
  • Method using delay line type surface acoustic wave sensor to test characteristic parameters of article

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[0033] Below in conjunction with accompanying drawing, the technical scheme of the present invention is described in further detail:

[0034] like image 3 Shown, a delay line type surface acoustic wave sensor test system. Its structure includes a signal source module, a delay line type surface acoustic wave sensor, a signal conversion module, a signal acquisition module, a microcontroller module, and a display module. The output end of the signal source module is respectively connected to the input end of the sensor and the first input end of the signal conversion module, the output end of the sensor is connected to the second input end of the signal conversion module, and the output end of the signal conversion module is connected to the input end of the signal acquisition module The output end of the signal acquisition module is connected to the input end of the microcontroller module, and the output end of the microcontroller module is connected to the input end of the si...

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Abstract

The invention discloses a method using a delay line type surface acoustic wave sensor to test characteristic parameters of an article and belongs to the technical field of novel sensor testing. The method can test the characteristic parameters based on amplitude-frequency characteristics and phase characteristics of the delay line type surface acoustic wave sensor. Firstly, a signal source outputs drive signals in a certain frequency range at certain frequency space sweep frequency, the resonant frequency can be obtained by measuring the signal amplitude ratio between input drive signals and output response signals of all sensors at all frequency points in a sweep frequency range, the signal source can output fixed-frequency drive signals on the basis, and the characteristic parameters of an object to be detected can be accurately detected by measuring the phase difference between the input drive signals and the output response signals of the sensors. The method enables the delay line type surface acoustic sensor to break the lab using limit and achieves industrial online application.

Description

technical field [0001] The invention relates to a delay-line surface acoustic wave sensor, in particular to a testing method for a delay-line surface acoustic wave sensor based on amplitude-frequency characteristics and phase characteristics, and belongs to the technical field of new sensor testing. Background technique [0002] The surface acoustic wave (Surface Acoustic Wave, SAW) sensor is a new type of sensor, which has a broad application prospect. At present, surface acoustic wave sensors can be used in many fields such as temperature sensing, pressure sensing, torque sensing, gas sensing, and liquid sensing. [0003] From a structural point of view, SAW sensors can be divided into two types: delay line (Delay Line) type and resonator (Resonator) type. The structure of the delay line SAW sensor is as follows: figure 1 As shown, it includes a piezoelectric substrate 1 , an input IDT 2 and an output IDT 3 . The excitation signal is added to the input interdigital tran...

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Application Information

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IPC IPC(8): G01D5/48
Inventor 陈智军张亦居蒋玲童锐王昕辰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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