Abstract
An impulse source concept is described in which the potential energy of the pressure head of an underwater environment is converted to kinetic energy of an imploding flow which, in turn, is converted to an acoustic impulse free of after‐shot clutter. This energy conversion concept has been realized in various hardware forms under the designation HYDROSHOCK.® It is characteristic of this class of source that considerable latitude exists in specifying the spectral level and spectral shape of the transmitted signal. The conversion mechanisms will be outlined, and the properties of several of the existing HYDROSHOCK® devices will be described. One recently developed source exhibits a peak source level of 255 dB re 1 μPa at 1 m, a pulse duration of 40 μsec, and a useful spectrum extending from 20 Hz to 100 kHz. The trade offs in source configuration between source level and bandwidth will be described, and comparisons will be made to spark sources, air guns, and various explosive devices. Applications for such impulse sources will also be reviewed. [This research has been supported by the Office of Naval Research, Code 222.]
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