Sonar: Hydrophone, Underwater Transducer.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Automatic Sensitivity Control Hydrophone

Automatic Sensitivity Control Hydrophones (receivers) detect the information being carried on by signal frequencies, and not by signal levels (amplitudes) and phases such as Doppler sonar for speed measurement, ASK and FSK digital communication, etc...
The hydrophone maintains suitable (or constant) voltage amplitude at output despite the variations of the detected sound pressures by automatically reducing its sensitivity when the sound is strong and raising it when sound is weak. It has 80dB dynamic range to equalize the differences in received sound intensities emitted by different sound sources, amplitude variations in a single sound source due to fading or reduced power, as well as varying echo levels caused by sound propagation loss in SONAR and ultrasonic testing.
The built-in bandpass filter allows the receiver to detect the sound of the interest and reject the sounds out of its bandwidth.

Automatic Sensitivity Control HydrophoneAutomatic Sensitivity Control Hydrophone

BII-7030 Series Automatic Sensitivity Control Hydrophone for SONAR and NDT: 80dB Range

Typical Applications  
Compensate Propagation Loss & Target Strength Search of Acoustic Beacons: Tag, Pinger and Locator
Underwater Digital and Voice Communication Passive Acoustic Monitoring (PAM System)
Doppler SONAR, Echo Sounding Pulsing Ultrasonic Testing
Related Products  
Hydrophone & Acoustic Sensor: Low Noise, Low Power, Miniature... BII-7080 Programmable Sensitivity Hydrophone

Specification:

Equalizing Hydrophone Datasheet
Information: Acoustic Components and System: Installation/Mounting, Ordering, Wiring, Array & Aperture Design and much more.

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