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Laser-electromagnetic ultrasonic nondestructive testing system

An electromagnetic ultrasonic and non-destructive testing technology, applied in measuring devices, material analysis by optical means, instruments, etc., can solve problems such as easy missed detection, and achieve the effect of increasing magnification, increasing limit value, and increasing sensitivity

Active Publication Date: 2012-12-12
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 Th...

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Abstract

A laser-electromagnetic ultrasonic nondestructive testing system belongs to the field of nondestructive testing and evaluation of metal materials. The nondestructive testing system first uses a pulsed laser system to emit a laser pulse, which is transported to the surface of a metal material through a line focusing optical lens; a thermal expansion principle or ablation principle of the metal material surface caused by laser is utilized to motivate ultrasonic; and then a designed electromagnetic ultrasonic sensor can receive ultrasonic signal in a lift-off distance of no more than 10 mm (lift-off distance refers to the distance between the electromagnetic ultrasonic sensor and the material to be detected). The system overcomes a problem that an existing laser ultrasonic detection technology is difficult to be used for the detection of material with rough surface, so as to get rid of the limit that the lift-off distance of the electromagnetic ultrasonic sensor must be less than 2mm. The system uses simple equipment, is convenient for operation and easy for practicability, and has high measurement accuracy and good repeatability. Therefore, the system provided by the invention is beneficial to further promotion and application of laser-electromagnetic ultrasonic detection technology, and 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 10 mm. 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 high...

Claims

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Application Information

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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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