3209 発振レーザ走査法による超音波の可視化と非破壊検査への適用性(J06-3 計測・モニタリングII,J06 知的材料・構造システム)

概要

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We propose a laser-based ultrasonic technology for visualizing the propagation of ultrasonic waves. While scanning an object with a pulsed-laser beam to generate ultrasonic waves, we detected the propagated waves by means of a fixed PZT transducer. Although the detected waves were generated from different irradiation points, we were able to produce animated images of the ultrasound generated at the reception-transducer position by applying simple data processing to the measured waveform data. Because this method requires no adjustment of the beam incident angle and beam focus, we can easily visualize the ultrasound on solid media having any complex-shape. We presented some visualization results of the propagations of ultrasounds around artificial defects, which demonstrate the validity of this method in nondestructive flaw inspection. The distinguishing features of this method are even applicable to field inspection work.
2006-09-15