Near grazing scattering by slight rough surfaces
Bailie, James Matthew
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It has been predicted that point source radiation which is at near-grazing incidence to a slightly rough surface generates a boundary wave in the fluid as well as the better known volume wave (I. Tolstoy, J. Acoust. Soc. Am., 63, S60, (1978)). Anechoic chamber experiments, using a surface constructed of rigid hemispheres on a rigid plate, have been performed to compare with theory. The experiments confirm that the relative boundary wave amplitude to volume wave amplitude increases as the 3/2 power of the sound frequency when the source and receiver are on the boundary. However, the predicted r 1/2 growth with range reaches a limit at kr~100. For the receiver above the rough surface the experimental values of the scattered sound show some agreement with theoretical predictions.
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