SECURITY GUARD fiber optic devices based on Rayleigh scattering

摘要

The invention relates to a fiber-optic security alarm devices unauthorized entry to the protected area violators objects with a large area. The technical result is a significant increase in the length of fiber optic cable and to increase the accuracy of localization penetration place. The result is achieved by using a single-mode fiber optic sensor cable with the effect of Rayleigh scattering, polarizing infrared, direct and reflected light signal propagating through the fiber. The extent and location of the polarization of the light signal determined in the device by the emission of a difference signal of the two light fluxes generated from the same source - the laser oscillator. One luminous flux is not modulated, and the modulated second and twice passed through the optical circulator and a single-mode fiber optic cable, the forward and reverse direction.