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Method and device for judging deviation of working point of optical acoustic sensor

An acoustic sensor and working point technology, applied in the field of optical acoustic sensing, can solve the problems of increasing the cost and power consumption of the sensor system, limiting the practical application of the sensor, and being unfavorable for mass promotion and application, and achieves high promotion and application value, simple structure, low cost effect

Active Publication Date: 2020-09-25
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to manufacturing errors and environmental influences, especially factors such as changes in ambient temperature, the working point of the sensor will deviate from the optimal position when it is in a static state, reducing its response characteristics to sound waves, which limits the practical application of the sensor
In order to overcome this problem, most of the existing solutions focus on constructing multi-wavelength or broadband detection optical system to obtain quadrature detection signals for phase demodulation to avoid the problem of operating point. This method is effective but additional in the sensor system. Highly demanding optical devices and complex algorithm processing greatly increase the cost and power consumption of the sensor system, which is not conducive to mass promotion and application

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  • Method and device for judging deviation of working point of optical acoustic sensor
  • Method and device for judging deviation of working point of optical acoustic sensor
  • Method and device for judging deviation of working point of optical acoustic sensor

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Embodiment 1

[0035] In the first exemplary embodiment of the present invention, a device for judging the deviation of the operating point of an optical acoustic sensor is provided. figure 2 It is a schematic diagram of the structure of the device for determining the deviation of the operating point of the optical acoustic sensor of the present invention.

[0036] Such as figure 2 As shown, the device for judging the deviation of the operating point of the optical acoustic sensor includes:

[0037] Optical acoustic sensor including

[0038] Laser light source 1, used to emit light signals;

[0039] The optical interference type acoustic probe 2 is used for receiving the optical signal emitted by the laser light source 1, and responding to the acoustic signal emitted by a standard acoustic source 4, and outputting the optical signal modulated by the acoustic signal;

[0040] The photodetector 3 is used to receive the optical signal modulated by the acoustic signal output by the optical interference ...

Embodiment 2

[0058] In a second exemplary embodiment of the present invention, a method for judging and calibrating the deviation of the operating point of an optical acoustic sensor is provided; figure 1 It is a flowchart of the method for judging and calibrating the deviation of the working point of the optical acoustic sensor of the present invention; image 3 Fig. 4(1) is the first time-domain waveform and frequency spectrum data diagram of the working point deviation state of the optical acoustic sensor of the present invention; Figure 4 (2) is the second time-domain waveform and spectrum data diagram of the operating point deviation of the optical acoustic sensor of the present invention; Figure 4 (3) is the time-domain waveform and spectral data of the optical acoustic sensor operating point to the best state of the present invention Figure.

[0059] Such as figure 1 with image 3 As shown, the method for judging and calibrating the deviation of the operating point of the optical acou...

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Abstract

The invention relates to an operating point deviation judgment method and device for an optical acoustic sensor. The optical acoustic sensor comprises a light interference type acoustic probe, a photoelectric detector and a signal acquisition and processing module. According to the operating point deviation judgment method of the invention, frequency multiplied signals caused by operating point deviation are adopted as a judgment standard, and the working point state of the optical acoustic sensor is automatically identified and is adjusted to be in an optimal position. The operating point deviation judgment method and device for the optical acoustic sensor of the present invention have the advantages of simple desired system, low cost, low power consumption cost, in-situ real-time adjustment, high control precision and the like, and are particularly suitable for a portable acoustic detection device working in a complex environment.

Description

Technical field [0001] The invention relates to the technical field of optical acoustic sensors, and in particular to a method and a device for judging the deviation of the operating point of an optical acoustic sensor. Background technique [0002] Compared with the traditional electrical acoustic sensor, the optical acoustic sensor has the advantages of simple structure, low power consumption, high sensitivity, wide acoustic frequency response range, and no electromagnetic radiation. It is more suitable for working and networking detection in complex electromagnetic environment and bad weather conditions. . Optical acoustic sensors have a wide range of application prospects in industry, military, medical, environmental protection and other fields. They can be used for environmental noise monitoring, pipeline gas leakage monitoring, ultrasonic mechanical flaw detection, ultrasonic health diagnosis, and the daily operation of electricity, motors and other equipment for monitoring...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/006
Inventor 祁志美张萌颖胡昕宇任迪鹏吴高米马振钧
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI