Frequency-modulated monitor hydrophone system

Details Frequency-modulated monitor hydrophone system Frequency-modulated monitor hydrophone system

1995-04-21

1996-12-03

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Testing, monitoring, or calibrating

H04B 1700

Patent

active

H00016195

ABSTRACT:
The frequency modulated monitor hydrophone system which is used to monitor low frequency sound signals where cross-talk coupling is a problem, consisting of a hydrophone, preamplifier and receiver which includes a control group. The hydrophone comprises an acoustic sensor and low-noise preamplifier utilizing dynamic range compression to condition the electrical acoustic sensor signal before it is frequency modulated (FM) and applied to a coaxial cable. At the remotely located receiver, the FM signal from the hydrophone preamplifier is filtered to remove undesirable signals, such as audio spectrum crosstalk and out of band signals. The partially recovered audio signal is decompressed utilizing dynamic range decompression, amplified, and output for utilization or recordation by an operator. A calibration circuit provides a continuity or partial calibration check for the hydrophone by applying a signal of predetermined frequency and voltage to the hydrophone preamplifier and sensor. A microprocessor in the control group periodically reads the input signal and controls the various receiver and hydrophone preamplifier circuits. Selected controls on the panel of the control group allows the operator to set gains, perform the calibration procedures, and monitor system performance.

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