Low-frequency directional hydrophone

Details Low-frequency directional hydrophone Low-frequency directional hydrophone

1978-09-28

1980-09-16

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

367126, G01S 380

Patent

active

042234000

ABSTRACT:
A directional hydrophone and electronic circuit combination giving a (cosp.2 .theta.) directivity pattern. A monopole transducer is placed coaxially within a ring transducer and the ring output is fed to a function-conversion electronic circuit which provides a (sin.sup.2 .theta.) output signal. This signal and the output signal of the monopole are fed to a weighted differential amplifier where they are subtracted. The output of the amplifier is a (cos.sup.2 .theta.) signal. By utilizing different components in the function-conversion circuit, the device can be made narrowband or broadband.

REFERENCES:
patent: 2396222 (1946-03-01), Foldy

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