Laser-scanned photoacoustic spectroscopy has been used to detect tightly closed surface flaws in three types of silicon-base structural ceramic materials. The amplitude of the photoacoustic signal was found to be greater for silicon nitride materials. The repeatability of detecting and locating flaws was excellent both in terms of the amplitude of the photoacoustic signal and signal-to-noise ratio.
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Khandelwal et al. (1980) studied this question.
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