Abstract:Acoustic waves, with wavenumber k and incidence angle θ, forward scattered from a randomly rough surface, with root-mean-square roughness height h, lose coherence with the incident field as khcos θ increases. Recovering reflected field-coherence is possible via the frequency-difference autoproduct, a quadratic product of complex field amplitudes at nearby frequencies within the signal bandwidth. By downshifting recorded frequencies, the apparent roughness of a surface is reduced and coherence can be regained. … Show more
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