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Laser-electromagnetic ultrasonic nondestructive testing system

An electromagnetic ultrasonic and non-destructive testing technology, applied in measurement devices, material analysis by optical means, instruments, etc., can solve problems such as easy missed detection, and achieve the effects of increasing magnification, improving sensitivity, and eliminating electrical noise.

Active Publication Date: 2014-09-03
山东泰威声电信息技术有限公司
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Problems solved by technology

This limitation of lift-off distance will lead to missed detection when detecting materials with large surface roughness or inclination

Method used

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Embodiment Construction

[0024] The principle and features of the patent of the present invention will be described below in conjunction with the accompanying drawings. The example given is the test result of the aluminum plate (grade 6016).

[0025] figure 1 It is a schematic diagram of a laser-electromagnetic ultrasonic nondestructive testing system with high lift-off distance. First, the pulse laser, three-dimensional mechanical stepping device, electromagnetic ultrasonic receiving unit, signal amplification and filtering unit, digital oscilloscope and computer are electrically connected in sequence, and the electromagnetic ultrasonic receiving unit is fixed on the three-dimensional mechanical stepping device. Calibrate the positions of the pulsed laser and the linear focusing unit so that they are placed concentrically. Adjust the position of the cylindrical lens in the linear focusing unit so that the distance between the aluminum plate and the cylindrical lens is 200 mm.

[0026] figure 2 A ...

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Abstract

A laser-electromagnetic ultrasonic nondestructive testing system belongs to the field of nondestructive testing and evaluation of metal materials. This kind of non-destructive testing system first uses the pulse laser system to emit pulse laser, which is transported to the surface of the metal material through the line focusing optical lens, and uses the principle of thermal expansion or ablation of the surface of the metal material caused by the laser to excite ultrasonic waves, and then uses the designed electromagnetic The ultrasonic sensor can receive ultrasonic signals within the range of lift-off distance ≤ 10mm (lift-off distance refers to the distance between the electromagnetic ultrasonic sensor and the material to be detected). This system overcomes the problem that the existing laser ultrasonic detection technology is difficult to use in the detection of rough surface materials, and gets rid of the limitation that the lifting distance of the electromagnetic ultrasonic sensor must be less than 2mm. The equipment used in the system is simple, easy to operate, easy to use, and high in measurement accuracy. The repeatability is good, it is helpful to the further popularization and application of the laser-electromagnetic ultrasonic detection technology, and it has great economic and social benefits.

Description

technical field [0001] The invention relates to a laser-electromagnetic ultrasonic nondestructive testing system, which belongs to the field of nondestructive testing and evaluation of metal materials. Background technique [0002] So far, there is no laser-electromagnetic ultrasonic testing system that can perform non-destructive testing at a lift-off distance of 10mm. Most of the ultrasonic methods used to detect metal material defects are based on contact piezoelectric ultrasonic technology, which makes it difficult to implement detection in harsh environments, such as high temperature, low temperature, radiation, corrosive environments, and large surface defects. roughness etc. The existing non-contact laser ultrasonic technology mostly uses laser excitation ultrasonic and laser interferometer to receive ultrasonic for non-destructive testing. This method is limited by the response time and sensitivity of the light intensity received by the interferometer, and has highe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/17
Inventor 赵扬贾中青宋江峰郭锐马健刘帅孙继华翟瑞占
Owner 山东泰威声电信息技术有限公司
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