Abstract
An ultrasonic beam produced in water by an oscillating quartz crystal (frequency, 1145 kc; wave-length, 1.3 mm) is scattered by cylindrical obstacles. Three different obstacles are used: (i) a 14″ steel rod, (ii) a 12″ steel rod, and (iii) 58″ hollow polystyrene tube. Lateral pressure amplitude distribution curves are obtained at different points along the axis of the beam for various positions of the obstacles on the axis. The effect of lateral displacements of the obstacles is studied. Wave-front determinations are made with and without obstacles. The conclusion is reached that transmission through and reflection by the obstacles play an insignificant role compared with diffraction around them.
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