레이저 초음파의 횡파를 이용한 평판의 이면결함 측정에 관한 연구

Recently, an industrial interest for laser ultrasonic inspection system is increasing. A laser ultrasonic inspection system is non-contact inspection device which generates and measures ultrasounds by using laser beams. A laser ultrasonic inspection system provides a wide-band spectrum because the ultrasonic signal generated by a pulse laser beam and provides a high measurement resolution because the ultrasound is measured from a small focused spot of a detecting laser beam. In this paper, we have studied on the inspection technique of an opposite-side defect in a plate by using a laser-based shear wave. In this study, we could experimentally confirm that an opposite-side defect could be detected by observing the receiving of the laser-based shear wave.