Laser Measurement of SAM Bulk and Surface Wave Amplitudes for Material Microstructure Analysis

Abstract

ABSTRACT. We present a hybrid acoustic imaging technique to directly visualize acoustic waves propagating within a thin silicon plate. A high frequency acoustic point focus lens was used to form a small point source within the plate. A laser interferometric system was used to visualize the acoustic wave propagation. Distinct amplitude patterns at each focal plane were experimentally visualized. The measured amplitude patterns exhibited the cubic symmetry of the material and the effects of focusing of the source outside and inside the material.