Determination of sound velocities by high frequency complex V(z) measurement in acoustic microscopy

Abstract

An amplitude-and-phase-measuring acoustic microscope operating at frequencies higher than 100 MHz has been developed. Complex V(z) curves of fused silica and aluminum were measured at 400 MHz with high accuracy. Inverse Fourier transform of each V(z) curve was achieved to give the reflectance function of the specimens. The Rayleigh, longitudinal and shear critical angles were obtained from the results. These were in good agreement with the theoretical predictions. © 1992 The Japan Society of Applied Physics.