The Design of Deep-Submergence Hydrophones
NAVAL RESEARCH LAB ORLANDO FL UNDERWATER SOUND REFERENCE DIV
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The goals and achievements in the development of a long-life, deep- submergence, wide-frequency-range hydrophone based on tried and proved designs and materials are summarized. The hydrophone has been divided into sensor, preamplifier, and cable assembly compartments to minimize failure and to facilitate construction and repair. All joints have double O-ring seals. The piezoelectric element is double-booted with butyl rubber as the water barrier. Each boot is filled with degassed, low-water-vapor castor oil. All of the exterior metal parts are covered with an elastomer to minimize corrosion and to reduce the possibility of electrical crosstalk. Fourteen different sensor elements were constructed and evaluated, and four hydrophones of one design have been constructed to give in-service evaluation. The report includes a discussion of the sensor element, charts of sensitivity and directional characteristics, photographs of hydrophones and subassemblies, an assembly drawing, and a set of specifications. Data are included on elastomers and metals suitable for use at depths as great as 9000 meters.
- Electrical and Electronic Equipment