Low-Frequency Directional Hydrophone.
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
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
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