A self-adaptive irregular surface laser ultrasonic imaging detection system and detection method

Abstract

The invention discloses an adaptive irregular surface laser ultrasonic imaging detection system and a detection method. The detection system of the present invention includes a surface profile measurement module, a laser scanning control module, an ultrasonic data acquisition module, and a composite imaging and evaluation module, and the surface profile measurement module is connected with the laser scanning control module and the composite imaging and evaluation module respectively, and is used The laser scanning control module and the ultrasonic data acquisition module are two independent modules that work synchronously to realize the excitation and reception of the laser ultrasonic signal respectively; the superimposed imaging and evaluation module performs the laser ultrasonic signal Virtual focusing processing and superimposed imaging display of the workpiece surface contour to identify and locate defects and structural echoes. The invention can realize the non-contact laser ultrasonic scanning detection on the irregular surface of unknown geometry, quickly identify the defect signal and visually display the relative position of the defect inside the irregular workpiece.

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...

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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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