Abstract

A new combination of pulsed ultrasonic waves and laser light with proper signal processing techniques is shown as a means of nondestructive testing. This method is suitable for inspection of the conditions in narrow, long regions, such as inside a pipe. The construction and basic experimental results are shown, and the effects of the signal processing are emphasized. As typical of the sensitivity of the system, an object 3 mm high placed at a 500-mm distance from the open aperture of a 26-mm diam pipe could be detected.

© 1976 Optical Society of America

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