Recently, the longitudinal, shear and surface waves have been very widely used as a kind of ultrasonic wave exploration
methods to identify internal defects of metallic structures. The ultrasonic wave-based non-destructive testing (NDT) is
one of main non-destructive inspection techniques for a health assessment about nuclear power plant, aircraft, ships,
and/or automobile manufacturing. In this study, a noncontact pulsed laser-based flaw imaging NDT technique is
implemented to detect the damage of a plate-like structure and to identify the location of the damage. To achieve this
goal, the Nd:YAG pulsed laser equipment is used to generate a guided wave and scans a specific area to find damage
location. The Nd: YAG pulsed laser is used to generate Lamb wave and piezoelectric sensors are installed to measure
structural responses. Ann aluminum plate is investigated to verify the effectiveness and the robustness of the proposed
NDT approach. A notch is a target to detect, which is inflicted on the surface of an aluminum plate. The damagesensitive
features are extracted by comparing the time of flight of the guided wave obtained from an acoustic emission
(AE) sensor and make use of the flaw imaging techniques of the aluminum plate.
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