A curved face hydrophone array has been designed, constructed, and tested for 20 000-ft-depth operations. A basic description of the hydrophone design, in which the hydrophone consists of a beamforming array of staves mounted on the circumference of a 20-in-diam. cylindrical housing, is presented. Since conventional pressure-release materials cannot be used in the construction, solutions to problems encountered, such as improper backing impedances for the individual elements and flexural waves genernated in the housing wall, will be briefly discussed. A presentation of the hydrophone frequency response and beam patterns shows that the transducer properties are insensitive to hydrostatic pressures as great as 1000 psi.
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