METHOD FOR DETECTING LOCAL ADDITIONAL LOSSES IN OPTICAL FIBER BY BACKGROUND METHOD Russian patent published in 2017 - IPC G01M11/02 H04B10/71 

FIELD: physics.

SUBSTANCE: method for detecting local additional losses in the optical fiber by the method of backscattering consists in forming short probing pulses and converting them into optical pulses, introducing them into an optical fiber, receiving from the backscattered fiber and reflected signals, which are converted into an electrical signal, after which it is amplified, converted into digital form and its average value is calculated, from which the reflectogram is formed. Based on the reflectogram analysis, the value of additional losses is determined. The location of the defect is determined taking into account the sampling pulse period selected based on the ratio of the predetermined detection time of the violation and the required number of calculations of the average value of the received signals to provide a predetermined signal-to-noise ratio.

EFFECT: decreasing the period of the probing pulse follow-up to ensure the set inertia.

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