Photoacoustic Microscopy

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Date
1981
Authors
Favro, L
Inglehart, L
Kuo, P
Pouch, J
Thomas, R
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Recent advances in scanning photoacoustic microscopy (SPAM) for NDE are described. Conventional and phase-contrast modes are used to detect a well-characterized subsurface flaw in Al, and the results are shown to be in good agreement with calculations based upon a three-dimensional thermal diffusion model. Applications of the technique are given which demonstrate surface and subsurface flaw detection in complex-shaped ceramic turbine parts. Photoacoustic pictures are presented of an integrated circuit semiconductor chip and show 6 μm resolution.

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