Diffuse reflection type double-light-path air vibration detection system and method

A technology of air vibration and detection system, applied in measuring devices, using optical devices, using wave/particle radiation, etc., can solve the problems of not considering the characteristics of vibration sources, difficult air vibration detection, etc., to eliminate instability, efficient and stable detection. Effect

Active Publication Date: 2021-02-02
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0010] Aiming at the above-mentioned deficiencies in the prior art, the diffuse reflection dual optical path air vibration detection system and method provided by the present invention solve the problem that the existing air vibration detection process does not consider the characteristics of the vibration source itself, such as instability, light propagation process, etc. Interference factors, difficult to achieve accurate air vibration detection problems

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  • Diffuse reflection type double-light-path air vibration detection system and method
  • Diffuse reflection type double-light-path air vibration detection system and method

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Embodiment 1

[0040] The invention utilizes the timing characteristics of the vibration of the voice signal in the air when it propagates on the surface of the flexible object, combines the dual optical path heterodyne detection technology to obtain the first-order differential signal of the voice vibration signal, and finally restores the voice vibration signal through time integration.

[0041] Based on the above-mentioned principles, the diffuse reflection type dual optical path air vibration detection system in the embodiment of the invention, such as figure 1As shown, it includes an infrared laser 1, an infrared collimating mirror 2, an infrared 45° semi-transparent mirror 4, a first infrared 45° reflector 3, a flexible object 11, an infrared filter 5, and a second infrared 45° reflection mirror 6, infrared convex lens 7, infrared detector 8, digital oscilloscope 9 and vibration signal post-processor 10;

[0042] The infrared light emitted by the infrared laser 1 passes through the inf...

Embodiment 2

[0049] like figure 2 As shown, this embodiment provides a diffuse reflection dual optical path air vibration detection method based on the above detection system, including the following steps:

[0050] S1. Infrared light is emitted through an infrared laser, and after being collimated by an infrared collimator, a parallel beam is formed and emitted to an infrared 45° half-transparent mirror;

[0051] S2. The parallel light beam is transmitted and reflected through the infrared 45° half-mirror. The transmitted light obtained by the transmission treatment is emitted to the point B of the flexible object, and the reflected light obtained by the reflection treatment is reflected by the first infrared 45°. Point A of the flexible object is irradiated after mirror reflection;

[0052] S3, based on the vibration signal S(t) generated by driving the air vibration signal S(t) on points A and B on the flexible object A ) and S(t B ), make the diffuse reflection light on the A point...

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Abstract

The invention discloses a diffuse reflection type double-light-path air vibration detection system, which performs differential detection on two points close to each other in a double-light-beam modeby utilizing a basic principle that pushing deformation is formed on the surface of a flexible object and time difference (phase difference) exists at different positions in an air vibration process of a detection area. The approximate time derivative of the vibration is obtained, the detection of the differential property of the vibration displacement is realized, the original signal is recoveredby using an integral mode, and the waveform of the original air vibration is effectively reduced; a series of interference factors such as instability of a light source and interference in the lightpropagation process are eliminated in a double-beam mode, and efficient and stable detection of air vibration is achieved.

Description

technical field [0001] The invention belongs to the technical field of laser measurement of air vibration, and in particular relates to a diffuse reflection double-optical-path air vibration detection system and method. Background technique [0002] With the advancement of industry, various vibration detection technologies are developing vigorously, among which the detection technology based on the principle of laser interference is becoming more and more mature. However, the detection of weak vibrations in the air is restricted by factors such as air flow, differences in surface optical properties, and coherence length limitations, and the practicability is very poor. In recent years, with the severe situation of public safety and national security, there is an urgent demand for voice monitoring, especially in the aspect of long-distance voice detection and monitoring, the demand is very rigid, but so far, it is easy to install and use The equipment with good effect is tec...

Claims

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Application Information

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IPC IPC(8): G01H9/00G01B11/16G01B11/02
CPCG01B11/02G01B11/16G01H9/00
Inventor 高椿明张萍王亚非李翔彭浩郭帅男
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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