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Optical non-contact detection device and method for acoustic disturbance on rough surface of solid material

A solid material, rough surface technology, applied in the field of laser ultrasonic non-destructive testing, can solve the problems of high cost and complex detection system principle.

Active Publication Date: 2021-07-06
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these technologies, the first three detection technologies have high requirements on the surface of the workpiece to be tested, and usually require the surface to achieve mirror reflection. Although the latter two detection technologies can realize rough surface detection, the detection system is usually complicated in principle and extremely expensive.

Method used

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  • Optical non-contact detection device and method for acoustic disturbance on rough surface of solid material
  • Optical non-contact detection device and method for acoustic disturbance on rough surface of solid material
  • Optical non-contact detection device and method for acoustic disturbance on rough surface of solid material

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Experimental program
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Embodiment 1

[0066] 1. The selected material to be tested is an aluminum plate with a specification of 200mm×100mm×1.94mm (length*width*thickness). The surface has not been treated in any way. It is difficult to achieve optical realization of ultrasonic waves propagating on the surface of solid materials using traditional light deflection methods. detection;

[0067] 2. Initialize the detection system first:

[0068] The detection device used is as figure 1 As shown, the detection light emitted by the detection continuous laser source 1 is focused by the first focusing lens 2 into a point spot and irradiated on the surface of the aluminum sample 6, and the reflected speckle spot is focused into a suitable size by the second focusing lens 3 to ensure high-precision digital micro The mirror array 7 collects the complete reflected light spot. All the micromirrors of the high-precision digital micromirror array 7 are placed in the "on" position, and the reflection spots are reflected on the ...

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Abstract

The invention discloses an optical non-contact detection device and method for acoustic disturbance on a rough surface of a solid material. Material samples, digital micromirror array, aperture, industrial camera CCD, photodetector, computer, oscilloscope. The method is as follows: firstly focus a beam of continuous detection laser on the sample surface, use the digital micromirror array to collect and evenly divide the reflected scattered light spots; Move; then use the photodetector to receive the power change of the digital micromirror reflection spot, and finally realize the optical detection of the rough surface acoustic disturbance. The invention can realize the non-contact detection of the acoustic disturbance along the rough solid material surface.

Description

[0001] 1. Technical field [0002] The invention relates to the technical field of laser ultrasonic non-destructive testing, in particular to an optical non-contact testing device and method for acoustic disturbance on rough surfaces of solid materials. [0003] 2. Background technology [0004] Non-destructive testing is based on the premise of not damaging the performance of the tested object, and uses a variety of physical and chemical methods to carry out effective inspection and testing of various materials, parts, and structural parts. It has applications in many industrial fields such as aerospace and nuclear energy, and has always been one of the key issues in the industrial field. At present, the five commonly used non-destructive testing techniques are: radiographic testing, ultrasonic testing, electromagnetic testing, penetrant testing and magnetic particle testing. Ultrasonic testing is different from the other four major testing technologies. It has the advantages...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/17G01N21/47
Inventor 倪辰荫阿雷克塞·罗莫诺索钱嘉树应恺宁王曦彬王昕悦沈中华
Owner NANJING UNIV OF SCI & TECH