Discriminating sonic detection system

Details Discriminating sonic detection system Discriminating sonic detection system

1970-09-25

1976-05-04

Farley, Richard A.

Communications: electrical

Selective

Monitoring in addition to control

340258A, G01S 966, G08B 1316

Patent

active

039551717

ABSTRACT:
A bistatic velocity detector system for underwater detection of objects of redetermined magnitude wherein the water may be capable of continual variations in velocity. The system includes a compensator that has an automatic gain controlled amplifier whose controlled output signal is applied first to an a.c./d.c. converter and then to an integrator circuit. A first voltage comparator receives the integrated signal to drive a relay for activating an alarm when a threshold is exceeded. A second voltage comparator having a lower reference voltage applied thereto drives an RC timer circuit whose output signal is applied to the gate of a field effect transistor of variable impedance for varying the gain of the operational amplifier. An alternative embodiment includes a dual gate transistor for use in the gain controlled amplification of the loop. The timer circuit is continually charging or discharging and the feedback loop thereby increases or decreases the gain of the amplifier to maintain a constant output value.

REFERENCES:
patent: 3121856 (1964-02-01), Finney
patent: 3383678 (1968-05-01), Palmer
patent: 3582870 (1971-06-01), Peterson et al.
patent: 3593165 (1971-07-01), Grubbs, Jr.
patent: 3740704 (1973-06-01), Suter

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