Ammunition and explosives – Igniting devices and systems
Patent
1956-03-05
1980-02-26
Jordan, Charles T.
Ammunition and explosives
Igniting devices and systems
F42B 2204
Patent
active
041899997
ABSTRACT:
1. A submarine mine actuating system responsive to the acoustic pressure nature of a target vessel moving through the water in the vicinity of the system comprising; an array of hydrophones including a first velocity hydrophone having a cosine response pattern and generating an electric signal in response to received underwater acoustic signals originating from said target vessel, and second velocity hydrophone having a response pattern similar to that of said first hydrophone and disposed in orthogonal relation therewith whereby the axes of maximum sensitivity of said hydrophones are mutually perpendicular so that the signals produced by said hydrophones undergo a phase reversal as the target vessel crosses an axis of maximum sensitivity of one of said hydrophones; a pair of transformers each having a primary coil coupled to the output of a respective one of said hydrophones to receive an output signal therefrom, a ring demodulator circuit having a first and a second pair of input terminals each connected across the respective secondaries of said transformers, a center-tap at each secondary winding of said transformers for providing an output signal from said demodulator circuit correlative to the phase relationship of the signals applied across the input terminals of said circuit to thereby indicate a phase reversal of the received acoustic signal as the target vessel crosses the axis of one of said hydrophones of said array.
REFERENCES:
patent: 1364615 (1921-01-01), Da Cruz
patent: 1390768 (1921-09-01), Dorsey
patent: 2166991 (1939-07-01), Guanella
patent: 2435253 (1948-02-01), Turner, Jr.
patent: 2529658 (1950-11-01), Massa
patent: 2530528 (1950-11-01), Kreer, Jr.
Branning A. L.
Jordan Charles T.
Sciascia R. S.
The United States of America as represented by the Secretary of
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