Abstract
The use of short, broad-band acoustic pulses to study the acoustic properties of the deep scattering layer is described. An underwater spark sound source, and a receiving hydrophone were lowered to the depth of the scattering layer to permit short range observations to be made. The received scattered sound was recorded oscillographically on a rotary drum camera in the ship. These records were subsequently reproduced in the laboratory with a flying spot reader, and a spectrum analysis covering the range of 1 to 10 kc was performed on the individual echoes. By the use of this technique, the frequency dependence of the scattering cross section of a number of individual scatterers was observed, permitting estimates of physical size to be made.
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