Laser ultrasonic detection device and detection method applicable to large component nondestructive detection

Abstract

The invention discloses a laser ultrasonic detection device applicable to large component nondestructive detection. The device comprises a power supply, a shell, an optical system and a control system, a laser outlet is formed in the front end of the shell, a handle and a handle seat are arranged on the upper surface plate of the shell, the optical system comprises a laser and lens assembly module, a total reflection mirror and a two-dimensional vibrating mirror, the laser and lens assembly module comprises a bottom plate, a shell, a laser component, a variable-focal lens system and a direct-current motor, the laser component comprises a laser, a polarization beam mirror, an attenuator and a light reflection detector, the two-dimensional vibrating mirror comprises an X-axis vibrating mirror, an X-axis motor, a Y-axis vibrating mirror and a Y-axis motor, and the control system comprises a vibrating mirror driving control board, a laser temperature control board, an X-axis driving circuit board, a Y-axis driving circuit board and a laser control board. The invention further discloses a laser ultrasonic detection method applicable to large component nondestructive detection. The device is convenient to carry and constant in energy and can detect larger areas once, and efficiency is effectively improved.

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 suitable 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 technol...

AI Technical Summary

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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