Abstract
The effects of a coupling liquid on the measurement of acoustic velocities were theoretically and experimentally investigated. The reflectance function was obtained from complex V(z) curves measured with an amplitude- and-phase-measuring acoustic microscope. Theoretical and experimental analyses were performed for six different specimens with water and mercury as couplers. Longitudinal, transverse and Rayleigh wave velocities were successfully measured provided that the acoustic impedance of the specimen was larger than that of the coupler by a factor of one to five. Longitudinal and transverse velocities were measured even if the acoustic impedance of the specimen was less than that of the coupler.
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