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Proceedings Paper

Nondestructive detection of small defects by laser ultrasonics
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Paper Abstract

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.

Paper Details

Date Published: 14 January 2000
PDF: 8 pages
Proc. SPIE 3887, High-Power Lasers in Civil Engineering and Architecture, (14 January 2000); doi: 10.1117/12.375202
Show Author Affiliations
Takuo Tanaka, Institute for Laser Technology (Japan)
Yasukazu Izawa, Institute of Laser Engineering/Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 3887:
High-Power Lasers in Civil Engineering and Architecture
Sadao Nakai; Lloyd A. Hackel; Wayne C. Solomon, Editor(s)

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