Abstract
Ultrasonic holography is a recording technique preserving phase and amplitude of a wavefront on a two-dimensional surface. This paper explores the possibility of using this technique to map phase changes occuring on an otherwise featureless surface by illuminating the surface at the Rayleigh critical angle. Since phase response at the critical angle is extremely sensitive to such things as stress concentrations, subsurface defects, or work hardening, it appears that this technique may offer a way to detect and map such distributions. We present preliminary experimental results that substantiate this claim.
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