FIBER-OPTICAL SUBMARINE DETECTOR Russian patent published in 1996 - IPC

FIELD: hydroacoustics. SUBSTANCE: device has coherent light source, locating and reference coils of first and second interferometers, two phase shifters, one of which is located in an optical arm of corresponding interferometer, two photodetectors, which are matched against fiber coils of corresponding interferometers. One correlator, which output is connected to recorder, first input is connected to first photodetector through delay line and is connected to second photodetector directly. Locating coils of interferometers are mounted coaxial and are spaced from one another by given distance. EFFECT: increased functional capabilities. 2 cl, 3 dwg