Abstract
Four rough surfaces 32 in. by 32 in. in size were made of a pressure-release material. The amplitude and phase of a pulsed wave scattered in the specular direction were measured at a frequency of 95.8 kHz for grazing angles from 6° to 80°. The theoretical approach of Gulin [Sov. Phys.—Acoust. 8, 228–234, (1963)] was used successfully in the Fresnel approximation to predict the observed amplitude and phase fluctuations for a Rayleigh parameter less than 0.6. Experimental measurements were extended to a Rayleigh parameter of 7.4. The observed fluctuations in the amplitude reached a maximum at a Rayleigh parameter of 2.5 and fluctuated about this value as the parameter increased to 7.4.
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