Accession Number : ADD007199

Title :   Vector Acoustic Mine Mechanism.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Anderson,Lloyd D

Report Date : 26 Feb 1980

Pagination or Media Count : 11

Abstract : This patent discloses a submarine mine actuating system responsive to the acoustic pressure signature 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 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. (Author)

Descriptors :   *Patents, *Acoustic mines, Firing mechanisms(Ammunition), Hydrophones, Acoustic arrays, Surface targets, Naval mines, Pressure mines, Sound pressure, Phase detectors, Discrimination, Passive systems, Acoustic signatures, Ship signatures, Transformers, Demodulators, Firing circuits, Actuators

Subject Categories : Ammunition and Explosives
      Underwater Ordnance

Distribution Statement : APPROVED FOR PUBLIC RELEASE