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14 January 2000 Nondestructive detection of small defects by laser ultrasonics
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Proceedings Volume 3887, High-Power Lasers in Civil Engineering and Architecture; (2000)
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan
The inside defect in carbon steel with the diameter of 100 micrometers was successfully detected by a laser ultrasonics technique. Irradiation of a Q-switched Nd:YAG laser was used for ultrasonic degeneration, and a frequency doubled CW Nd:YAG laser combined with a Fabry-Perot etalon were used for detection of ultrasonic vibration on the specimen surface. The ratio of the inside defect diameter to the ultrasonic wavelength was estimated to be approximately 0.067. We also measured the dependence of the amplitude ratios of the first defect signa and the second longitudinal wave to the first longitudinal wave on the defect diameter.
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Takuo Tanaka and Yasukazu Izawa "Nondestructive detection of small defects by laser ultrasonics", Proc. SPIE 3887, High-Power Lasers in Civil Engineering and Architecture, (14 January 2000);

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