Abstract
Laboratory experiments have been conducted in a water tank to investigate sound propagation over an underwater ridge with soft, finite impedance, very low density (0.12 kg/m3) and sound speed (250 m/s), and very high attenuation (2–3 dB/cm in the frequency range of interest of 50–85 kHz). The diffracted acoustic pressure was measured along the ridge surface and along a vertical axis behind the ridge. Good agreement was found between predictions from the theory of matched asymptotic expansions (MAE) and the experimental data. The diffracted sound field is quite sensitive to the acoustic attenuation of diffraction material, thus showing potential as an inversion technique to characterize soft material attenuation.
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