Accession Number : ADD007761

Title :   Low-Frequency Directional Hydrophone.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Zalesak,Joseph F ; Robinson,A Zed

Report Date : 16 Sep 1980

Pagination or Media Count : 9

Abstract : A directional hydrophone and electronic circuit combination giving a (cos sq 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 sq 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 sq theta) signal. By utilizing different components in the function-conversion circuit, the device can be made narrowband or broadband. (Author)

Descriptors :   *Patents, *Hydrophones, *Signal processing, Frequency response, Electronics, Low frequency, Transducers, Directional, Narrowband, Signals, Rings, Circuits

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE