Laser ultrasonic detection device and detection method for large member nondestructive testing

Abstract

The invention discloses a laser ultrasonic detection device for large member nondestructive testing. The laser ultrasonic detection device comprises a power source, a shell, an optical system and a control system, a laser light outlet is formed in the front end of the shell, and the optical system comprises a laser device and lens set module, a total reflection mirror and a two-dimensional galvanometer; the laser device and lens set module comprises a baseboard, a housing, a laser device assembly, a varifocus lens set and a direct current motor; the laser device assembly comprises a laser device, a polarized beam mirror, an attenuation slice and a light reflex detector, and the two-dimensional galvanometer comprises an X-axis galvanometer, an X-axis motor, a Y-axis galvanometer and a Y-axis motor; the control system comprises a galvanometer driving control board, an X-axis driving circuit board, a Y-axis driving circuit board and a laser control board. The invention further discloses alaser ultrasonic detection method applicable to large member nondestructive testing. The laser ultrasonic detection device is novel and reasonable in design, convenient to carry, easy to maintain andconstant in energy, a large area can be detected in a single time, the efficiency is greatly improved, the practicability is high, and the laser ultrasonic detection device is convenient to apply andpopularize.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to a laser ultrasonic testing device and a testing method for nondestructive testing of large components. Background technique [0002] Ultrasonic testing has the advantages of high sensitivity, strong penetrating power, convenient operation, and no pollution. It can reliably detect many defects in structures, and has become the main research direction of nondestructive testing. With the continuous development of laser technology and ultrasound, the research on laser excitation of sound waves in objects has become increasingly mature, forming laser ultrasound technology. In recent years, laser ultrasonic technology has been widely used in technical fields such as ultrasonic signal propagation, medium characteristic research, non-destructive testing and evaluation research, and has formed an important subject area - laser ultrasonic testing technology. Las...

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Problems solved by technology

[0003] At present, the excitation light source in the laser ultrasonic detection technology usually gathers the laser beam into a point light source, a line light source or a circular light source, which generally has the disadvantages of small active area, short propagation distance of the excited ultrasonic waves, and fast attenuation. The inefficiency caused by non-destructive testing of components cannot meet the application requirements of large structures in engineering practice

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