Laser ultrasonic imaging detection system and detection method for self-adaptive irregular surface

Abstract

The invention discloses a laser ultrasonic imaging detection system and a detection method for a self-adaptive irregular surface. The detection system comprises a surface contour measurement module, alaser scanning control module, an ultrasonic data collection module and a lamination imaging and evaluation module, and the surface contour measurement module is connected with the laser scanning control module and the lamination imaging and evaluation module and used for workpiece contour shape and size measurement and data transmission; wherein the laser scanning control module and the ultrasonic data collection module are two independent modules and work synchronously and cooperatively to realize excitation and reception of laser ultrasonic signals respectively; and the overlapping imagingand evaluation module performs virtual focusing processing on the laser ultrasonic signal and overlapping imaging display of the surface contour of the workpiece, and identifies and positions defectsand structural echoes. According to the invention, non-contact laser ultrasonic scanning detection can be carried out on an irregular surface with an unknown geometrical shape, a defect signal can bequickly identified, and the relative position of a defect in an irregular workpiece can be visually displayed.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and relates to a laser ultrasonic non-destructive testing technology, in particular to a laser ultrasonic imaging detection system and a detection method for an adaptive irregular surface. Background technique [0002] Ultrasonic testing is an important means to ensure the manufacturing quality and operational safety of industrial components. However, with the development of advanced manufacturing technology, especially the rapid development of technologies such as additive manufacturing, a large number of complex structural industrial components with irregular surfaces have emerged. When traditional ultrasound is applied to components with irregular surfaces, it is difficult to achieve good contact coupling between ultrasonic sensors and irregular surfaces, and detection methods such as water immersion are required. Water immersion detection is generally used for small-sized comp...

AI Technical Summary

Problems solved by technology

However, since the contour signal of the irregular surface cannot be obtained during detection, there are still major problems in laser ultrasonic scanning imaging detection: first, the trajectory planning of laser scanning cannot be adjusted in real time as the contour changes; second, in order to achieve small For defect detection, array ultrasonic focused imaging is usually used to improve the resolution of defect detection, and when facing irregular surfaces, array ultrasonic focused imaging will be disturbed by irregular surfaces, resulting in poor focusing effect; finally, not Structural echoes may also exist inside workpieces with regular surfaces, making it difficult to identify and locate defects

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