FIELD: measuring equipment.
SUBSTANCE: invention relates to measuring equipment using optical fiber, namely to fiber-optic security detectors, as well as to products, methods, and means related to fiber-optic security detectors and their aspects. An optical circuit of a fiber-optic security detector, which includes combined interferometers, is combined interferometers for the fiber-optic security detector, implementing an optical circuit containing closed and open loops forming reflection signals. The same sections of optical fiber of a cable are sensitive elements of interferometers, in which a shift of a probing pulse phase is created in accordance with exerted physical impact, the same for both loops. The closed loop is Sagnac interferometer, and the open loop is Michelson interferometer.
EFFECT: increase in the accuracy of determination of a place of impact on a sensitive element, provision of uniform sensitivity, increase in the reliability of a detector, simplification of mounting, implementation by the invention of its purpose.
7 cl, 12 dwg
