FIELD: measuring equipment.
SUBSTANCE: invention relates to measuring equipment, namely to fiber-optic security detectors. A fence with a linear part of the fiber-optic security detector is proposed, formed by a non-continuous obstacle extended between pillars installed on foundations, containing a sensitive element placed along a curvilinear trajectory of the non-continuous obstacle, providing vibration sensitivity and additional connection of elements. Combined interferometers are used, containing a station part with a transceiver, the linear part is a branched optical circuit based on splitters and a fiber-optic cable, containing closed and open loops forming reflection signals. The same sections of optical fiber are sensitive elements of interferometers, in which a shift of a probing pulse phase is created, the same for both loops. The closed loop is Mach-Zehnder interferometer, and the open loop is Michelson interferometer.
EFFECT: provision of uniform sensitivity of a fiber-optic security detector, increase in the reliability of the fiber-optic security detector, implementation by the invention of its purpose.
10 cl, 12 dwg
