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A pulsed acoustic laser probe is used to measure vertical acoustic displacements in the near field of surface defects. A method of optically determining acoustic reflection coefficients in the time domain is presented. The spatial variation of acoustic displacements over a slot is modeled with a static theory. This theory estimates a depth of 230 μm for a 250-μm-deep slot. A near field image of a fatigue crack demonstrates an application of the technique.
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Jungerman et al. (1984) studied this question.
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