Abstract
The scattering of an underwater ultrasonic beam from effectively infinitely long cylindrical liquid filled obstacles is studied. The wave-length of the radiation used is 1.3 mm and the obstacle diameter is 13 mm, thus placing this type of scattering between the extremes of scattering from obstacles large compared with the wave-length, and scattering from very small obstacles. In a previous paper the obstacles studied were air and steel, affording the two extremes of ρc mismatch, and the scattering was found to be a diffraction phenomenon. The present communication describes the scattering patterns produced by a cylinder of methyl alcohol, the first of a series of liquids used to determine the type of scattering (i.e., diffraction, refraction, or combinations) produced, as the ρc of the obstacle is varied slowly from values smaller, to values greater than that of water.
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