FIELD: optical fibre measuring equipment; optical fibre security detectors.
SUBSTANCE: method of signalling using the sensitive element of the dynamic fibre optic sensor (DOS) of the security fibre optic detector located on the movable element of the fence includes the steps at which the body of the DOS is placed on the movable element of the fence, where the DOS is a sensor containing a housing made with the possibility of placing it contains a sensitive element of the sensor formed by a coil of optical fibres and a splitter, the outputs of which are closed to each other by the said coil and form a closed loop that generates a reflection signal, and the splitter is configured to be connected to the transport part of the security fibre optic detector, a probing pulse of the reflectometer of the security fibre optic detector is fed through the transport part and splitters of the detector to the sensitive element of the DOS, the probing pulse at the input to the DOS is divided into two parts by means of a splitter of the sensitive element to direct them along the fibres of the coil in the opposite direction, after passing the parts of the pulse, they are added on the mentioned splitter, after which is fed to the input of the receiving device of the reflectometer and by means of a computing device the change in the phase difference of the terms on the said signal splitter is recorded.
EFFECT: invention eliminates the need to use electrical energy for the operation of a dynamic fibre optic sensor.
8 cl, 12 dwg
