Cavitating Parametric Underwater Acoustic Source.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent describes a cavitating parametric underwater acoustic source for generating efficiently acoustic energy at low and medium frequencies. The source comprises a plurality of electro-acoustic transducer elements which are electrically energized in a liquid medium such as water at two or more primary frequencies. Changes in the ambient liquid pressure at or adjacent the transducer cause cavitation in the liquid medium which produces a high degree of non-linearity resulting in the generation of sum and difference frequencies of the primary frequencies in the liquid. The difference frequency is used to transmit acoustic energy efficiently in the liquid medium.
- Acoustic Detection and Detectors