Abstract
In this study, a new standing wave energy (SWE) imaging technique is developed so that a crack in a metallic structure can be detection from ultrasonic wavefield image obtained by a laser scanning system. First, a non-contact laser ultrasonic scanning system is developed so that ultrasonic waves on a target structure can be generated and measured using two independent laser sources. Using this scanning system, an ultrasonic wavefield image with high spatial and temporal resolutions is constructed. The interaction of propagating ultrasonic waves with a crack is theoretically studied, and the creation of standing waves due to crack formation is confirmed. Then, the crack-induced SWE is isolated from the constructed wavefield image using the proposed signal processing technique, allowing the automated identification and localization of the crack. The effectiveness of the proposed technique is experimentally investigated using data obtained from a plate-like structure.
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