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. A signaling method using a fiber-optic security detector with a linear part with joint interferometers is claimed, according to which: the placement of sensitive elements of the linear part of the fiber-optic security detector is provided, which is a branched optical circuit, which is placed on fence elements, namely on a visor, and/or on canvas, and/or on an anti-ground barrier, by means of splitters, connecting couplings and a fiber-optic cable; a laser pulse is generated from an output of a transceiver to an input of the mentioned linear part, and a returned pulse is received, which is a reflection signal, to an input of the transceiver along the same path, but in the opposite direction. Moreover, the linear part contains an optical circuit of joint interferometers for the security fiber-optic detector, containing closed and open loops forming reflection signals, in which the same segments of optical fiber of the cable are sensitive elements of interferometers, in which a phase shift of a probing pulse is created in accordance with the physical impact, the same for both loops. The closed loop is a Sagnac interferometer, and an open loop is a Michelson interferometer, while a change in the value of the sum of reflection signals corresponding to the value and nature of the elastic deformation of sensitive elements is recorded.
EFFECT: increase in the accuracy of the determination of a point of impact on a sensitive element, in particular, due to the use of a joint interferometer method, since this method uses data from reflection signals of joint interferometers in each cycle of sending a probing pulse passing through the same optical fiber of a fiber-optic cable of a sensitive part, providing more predictable accuracy of the calculation of a distance to the point of impact on the sensitive element by a ratio of a value of reflection signals or a rate of their changes; provision of uniform sensitivity of the sensitive part of the fiber-optic security detector; increase in the reliability of the fiber-optic security detector, in particular, due to the reception of two signals from the same probing pulse, which provides greater protection of the protected perimeter from the influence of interference factors, the influence of drift of measuring properties of a transceiver; simplification of installation due to the elimination of the need to use compensation coils in its composition, which are necessary to compensate for the length of fibers of the sensitive element, as well as the implementation of its purpose.
10 cl, 12 dwg
