Laser ultrasonic detection device and method based on synthetic aperture focusing imaging

A technology of synthetic aperture focusing and laser ultrasound, which is applied in the direction of measuring devices, optical devices, instruments, etc.

Pending Publication Date: 2020-06-16
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology

Among the existing disclosed laser ultrasonic testing devices: there is no device that can perform SAFT testing on any curved surface

Method used

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  • Laser ultrasonic detection device and method based on synthetic aperture focusing imaging

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Embodiment 2

[0040] Based on the device of embodiment 1, a laser ultrasonic detection method based on synthetic aperture focusing imaging is proposed, comprising the following steps:

[0041] Step 100, first calibrate the coordinates of the three-dimensional vibrating mirror, the interferometer probe and the three-dimensional translation platform, and obtain the conversion relationship of the three coordinate systems;

[0042] Step 200, controlling the three-dimensional translation platform to scan the sample one-dimensionally through the industrial computer, and using a high-precision 2D laser displacement sensor to obtain the three-dimensional profile of the sample surface;

[0043] Step 300, converting the three-dimensional contour of the sample surface to the coordinate system of the three-dimensional translation stage;

[0044] Step 400, converting the coordinate system where the interferometer probe is located to the coordinate system of the three-dimensional translation platform;

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Abstract

The embodiment of the invention discloses a laser ultrasonic detection device and method based on synthetic aperture focusing imaging. The device comprises a pulse laser, a three-dimensional galvanometer, a scanning lens, an interferometer, a laser displacement sensor, a three-dimensional translation platform and an industrial personal computer; the three-dimensional translation table is used forplacing a sample; the three-dimensional galvanometer, the interferometer and the laser displacement sensor are arranged right above the three-dimensional translation platform; the scanning lens is arranged at one end, right opposite to the three-dimensional translation stage, of the three-dimensional galvanometer; the industrial personal computer is connected with the pulse laser and the three-dimensional translation stage, and the pulse laser is connected with the three-dimensional galvanometer. According to the device and the method provided by the embodiment of the invention, SAFT imaging of internal defects can be carried out on samples with any surface shapes.

Description

technical field [0001] The invention relates to the technical field of laser ultrasonic detection, in particular to a laser ultrasonic detection device and method based on synthetic aperture focusing imaging. Background technique [0002] The sealing treatment relying on artificially molten lead strips and hand application is a key link in the installation process of high-voltage cable accessories. Sealing failure will cause moisture to invade the interior of accessories and cables, directly threatening the safe operation of the line. The failure of the lead seal to cause water to enter the cable will cause electrical trees or water trees to grow on the rubber and plastic materials such as the shielding layer and insulating layer inside the cable, and there is a serious risk of partial discharge breakdown of the cable or accessories; at the same time, it will also cause corrosion of the internal metal materials and reduce the service life. , thereby shortening the life cycle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24G01B9/02
CPCG01B9/02042G01B11/2441
Inventor 何浩辉袁金晶何文罗鑫洪严俊韬
Owner GUANGDONG POWER GRID CO LTD
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