METHOD OF DETERMINING DEGREE AND LOCATION OF DISTURBANCE OF ZONE FIBER-OPTIC PROTECTION SYSTEM OF OBJECTS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2019 - IPC G08B13/186 

FIELD: optics.

SUBSTANCE: invention relates to fibre-optic interferometry and can be used in equipment which enables to detect penetration into a protected perimeter, for example, for prevention of overcoming barriers of industrial enterprises. In order to realize this result in method, sensitive cable is divided into zones, each of which represents Michelson fibre-optic interferometer. To realize the principle of frequency multiplexing, the difference of optical paths in the interferometers is different, and the laser has the possibility of tuning the radiation frequency according to the saw-tooth law. Interference signal is the sum of signals with different frequencies corresponding to different zones. Separators and reference frequency grid are used to separate signals. Penetration into the protected perimeter is determined by signals at the output of synchronous detectors.

EFFECT: technical result in method and device for its implementation is increase of accuracy of disturbance point determination at weak disturbance of protected perimeter.

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