Abstract
Experimental results will be presented to demonstrate the existence of a leaky wave generated at the Rayleigh angle by a finite ultrasonic beam incident at any angle of incidence to a liquid-solid interface. This important observation enables us to consider the study on the backscattering phenomena as a particular case of this general mechanism. Different parameters affecting the amplitude of the backscattered signal will be discussed. The choice of these parameters has been suggested by theoretical analysis of Bertoni and Tamir [Appl. Phys. 2, 157–172 (1973)]. The experimental results show that the backscattered energy increases with the Schoch displacement Δs and decreases with the beamwidth.
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