Backscatter from a composite rough surface
Decker, Wilson Banks
Wilson, O.B. Jr.
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Backscatter of acoustic signals generated from surfaces having point scattering and line scattering features is studied experimentally in air. Signals are analyzed for propagation over three models: a smooth plane wedge, a wedge whose surface is slightly roughened with uniformly-packed lead shot, and one randomly roughened with gravel. Scattering from the rough surfaces at normal incidence is measured to estimate the statistical parameters that describe the surface roughness. The returned acoustic energy from the composite area of rough surface and wedge for low grazing angles is analyzed to determine whether the identity of the two individual backscatter effects can be separated in their combined spectrum. the near grazing backscattered amplitudes are much larger than predicted by conventional rough surface scattering theory and suggest the presence of a backscattered boundary wave.
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