Noise-suppressing hydrophones

Details Noise-suppressing hydrophones Noise-suppressing hydrophones

1989-06-30

1990-05-22

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367157, 367901, 310337, 310316, 310800, 381 94, H04R 1700

Patent

active

049282646

ABSTRACT:
A hydrophone mounted on the hull of a ship comprises an electromechanical ansducer made of void-containing ceramic material having a high piezoelectric sensitivity to water-borne acoustic sound signals, a transducer made of solid ceramic material having a low piezoelectric sensitivity to hydrostatic acoustic signals, both transducers having similar piezoelectric sensitivity to shipboard noise transmitted via the ship's hull and transducer mounting; and means for sensing and manipulating voltage signals generated in response to water-borne acoustic signals and mount-transmitted shipboard noise such that the mount transmitted noise signals are largely cancelled out and a relatively noise-free signal representing hydrostatically transmitted sound is obtained.

REFERENCES:
patent: 4025724 (1977-05-01), Davidson, Jr. et al.
patent: 4232381 (1980-11-01), Rennick et al.
patent: 4354132 (1982-10-01), Borburgh et al.
patent: 4390976 (1983-06-01), Eynck
patent: 4686409 (1987-08-01), Kaarmann et al.
patent: 4695988 (1987-09-01), Banno

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