Abstract

The photoacoustic technique is applied to the nondestructive evaluation of Si₃N₄- and SiC-ceramic materials. Differences in subsurface porosity are observable, and seeded impurities have been detected. A knoop indentation, 25 μm in size, has also been detected.

© 1980 Optical Society of America

Photoacoustic effect in piezoelectric ceramics

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