Abstract
Experimental and theoretical results on the nonspecular reflection of finite acoustic beams incident at and near the Rayleigh angle onto a fluid-solid interface in contact w ith an elastic layer are presented. shaped acoustic beams have been performed on the reflected field amplitude distribution and . surface wavespeed dispersion for loading and stiffening layers where the fluid medium is water. It is shown that existing theory can be utilized to explain the results by constructing and solving boundary condition e quations for the Rayleigh wave pole a ppropriate for the lossless layered h alf-space with the fluid. Good agreement with the exact treatment is observed in most aspects of the measurements. In the model calculation the imaginary part of the Rayleigh wave pole is found to display an unexpected maximum at a value of layer thickness over wavelength where the real part corresponds nearly to the transverse wavespeed in the l ayer. Measurements with Gaussian
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