FIBER-OPTICAL VIBRATION TRANSDUCER Russian patent published in 1997 - IPC

FIELD: instruments which measure characteristics of acoustic waves. SUBSTANCE: device has two-wave coherent light source which output is connected to two-wave optical switch with control unit, first and second single-mode optical fibers, first light reflector for two waves, second light reflector for single wave, optical splitter and photodetector which are connected to provide Michelson interferometer. Semi-transparent reflector is provided inside first single-mode fiber. It serves as object arm of interferometer. Phase- shifting unit is provided in second single-mode fiber. In addition device has electronic processing circuit. EFFECT: increased functional capabilities. 3 cl, 3 dwg