Nd:YAG Pulsed Laser based flaw imaging techniques for noncontact NDE of an aluminum plate

Woong-Ki Park; Changgil Lee; Seunghee Park

doi:10.1117/12.915477

30 March 2012 Nd:YAG Pulsed Laser based flaw imaging techniques for noncontact NDE of an aluminum plate

Woong-Ki Park, Changgil Lee, Seunghee Park

Proceedings Volume 8346, Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2012; 83461H (2012) https://doi.org/10.1117/12.915477
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2012, San Diego, California, United States

Abstract

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.

Citation Download Citation

Woong-Ki Park, Changgil Lee, and Seunghee Park "Nd:YAG Pulsed Laser based flaw imaging techniques for noncontact NDE of an aluminum plate", Proc. SPIE 8346, Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2012, 83461H (30 March 2012); https://doi.org/10.1117/12.915477

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