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Distortion detector based on surface acoustic waves

A surface acoustic wave and detector technology, applied in the field of distortion detection, can solve the problem of low sensitivity and achieve the effect of high sensitivity of distortion detection and good application prospects

Inactive Publication Date: 2021-01-29
中山科立特光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low Sensitivity of Traditional Distortion Detection Techniques

Method used

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  • Distortion detector based on surface acoustic waves
  • Distortion detector based on surface acoustic waves
  • Distortion detector based on surface acoustic waves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The invention provides a twist detector based on surface acoustic waves. figure 1 is a side view of a surface acoustic wave based twisted detector. Such as figure 1 As shown, the surface acoustic wave-based twist detector includes a first fixed part 1 , a second fixed part 2 , a piezoelectric material strip 3 , a first interdigital transducer 4 and a second interdigital transducer 5 . The piezoelectric material strip 3 is fixed between the first fixing part 1 and the second fixing part 2 . The material of the piezoelectric material strip 3 is lithium tantalate, lithium niobate or quartz. The cross-section of the piezoelectric material strip 3 is rectangular, so that the first interdigital transducer 4 and the second interdigital transducer 5 are arranged conveniently. The first interdigital transducer 4 is arranged on one end of the piezoelectric material strip 3 close to the first fixing part 1 , and the second interdigital transducer 5 is arranged on the piezoelect...

Embodiment 2

[0023] On the basis of Embodiment 1, the two ends of the piezoelectric material strip 3 are thick, and the middle part of the piezoelectric material strip 3 is thin. That is to say, although the cross sections of the piezoelectric material strips 3 are all rectangular, the size of the rectangles gradually decreases from the two ends of the piezoelectric material strips 3 to the middle of the piezoelectric material strips 3 . In this way, on the one hand, it is convenient to arrange the first IDT 4 and the second IDT 5 at the two ends of the piezoelectric material strip 3; on the other hand, the piezoelectric material strip 3 is easier to twist and more It is easy to change the resonance frequency of the piezoelectric material strip 3 and improve the sensitivity of twist detection.

Embodiment 3

[0025] figure 2 is the top view of the SAW-based twisted detector. On the basis of Example 2, such as figure 2 As shown, a hole 6 is provided between the first IDT 4 and the second IDT 5 on the long side surface of the piezoelectric material strip 3, there are multiple holes 6, and the holes 6 are arranged periodically. In this way, on the one hand, the piezoelectric material strip 3 is more easily distorted; on the other hand, the distribution of the piezoelectric material in the piezoelectric material strip 3 is more concentrated. When twisting occurs, the change of stress in the strip of piezoelectric material 3 occurs at a more concentrated location, thereby changing the resonant frequency of the strip of piezoelectric material 3 more significantly. Both effects lead to the resonance frequency of the piezoelectric material strip 3 being more sensitive to twist, thereby improving the sensitivity of twist detection.

[0026] Furthermore, the size of the hole 6 is smalle...

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PUM

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Abstract

The invention provides a distortion detector based on surface acoustic waves. The distortion detectorcomprises a first fixing part, a second fixing part, a piezoelectric material strip, a first interdigital transducer and a second interdigital transducer, wherein the piezoelectric material strip is fixed between the first fixing part and the second fixing part, the first interdigital transducer isarranged at one end, close to the first fixing part, of the piezoelectric material strip, and the second interdigital transducer is arranged at one end, close to the second fixing part, of the piezoelectric material strip. The distortion detector has the advantage of high distortion detection sensitivity, and has a good application prospect in the field of distortion detection.

Description

technical field [0001] The invention relates to the field of twist detection, in particular to a twist detector based on surface acoustic waves. Background technique [0002] Distorted detection involves robotics, real-time monitoring of large buildings, etc. Traditional distortion detection techniques have low sensitivity. Contents of the invention [0003] In order to solve the above problems, the present invention provides a twist detector based on surface acoustic waves, including a first fixed part, a second fixed part, a piezoelectric material strip, a first interdigital transducer, a second interdigital transducer device, the piezoelectric material strip is fixed between the first fixing part and the second fixing part, the first interdigital transducer is arranged on one end of the piezoelectric material strip close to the first fixing part, and the second interdigital transducer is arranged An end close to the second fixing part on the piezoelectric material str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B15/06G01B7/16
CPCG01B7/16G01B15/06
Inventor 不公告发明人
Owner 中山科立特光电科技有限公司