Abstract
It has been reported before that an ultrasonic beam incident at the Rayleigh angle to a liquid-solid interface will produce a backscattered wave [S. Sasaki, Jap. J. Appl. Phys. 2, 198 (1963); W. G. Neubauer, J. Acoust. Soc. Am. Suppl. 1 68, S63 (1980); M. de Billy, these de doctorat d'etat (1980)]. Experimental results will be presented for various metals and glass. It appears that the backscattering is not due to grain structure or surface roughness alone but it is a finite beam phenomena. Results will be given for the effect of the beamwidth. This backscattering phenomena can be applied to measure the surface wave velocity for anisotropic materials.
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