FIELD: measuring equipment.
SUBSTANCE: invention relates to measuring equipment using optical fibre, to optical fibre security detectors. The security alarm system, containing a fence with a movable element with a sensor pusher placed on it, which is an end fibre-optic sensor, containing a housing with a pusher that provides a change in the position of at least one ring of the optical fibre of the sensitive part and a sensitive part made of a splitter, outputs which are closed to each other by at least one optical fibre coiled into a ring and together form a closed loop, and said ring is connected to said pusher and said body by means of rods, which, together with the ring, are extended inside the corresponding heat shrink tube.
EFFECT: simplification of the sensor design, simplification of the sensor manufacturing, continuous diagnostics of the serviceability of its condition and the optical line leading to it.
10 cl, 9 dwg
