METHOD OF ROUTE SEARCH AND DETERMINING PLACE OF OPTICAL CABLE FAULT Russian patent published in 2018 - IPC G01R31/08 H04B3/00 

FIELD: measuring equipment.

SUBSTANCE: invention relates to a measurement technique, namely, a method of route search and determining place of optical cable fault. Modulated sounding signal is introduced into the optical fiber, a source of directional vibration is moved above the cable longitudinally-transversely with respect to the intended cable route. By a separate communication channel, the movements of the source of the directional vibrating action and the level of vibration influence are controlled. Previously, using a pulsed optical reflectometer, whose optical radiation source has a coherence length less than the probe pulse length, measuring the backscattering characteristic of the optical fiber, then by means of a phase-sensitive pulsed optical reflectometer, in which the coherence length of the optical radiation source is longer than the duration of the probe pulse, the backscattering characteristic of the same fiber is measured in the absence of vibratory action, then produce a vibrating effect on the cable from the surface of the earth, moving the source of directional vibratory action over the intended path. Using a phase-sensitive pulsed optical reflectometer, the backscattering characteristic of the same fiber is measured under vibration action and jointly process the backscatter characteristics measured by pulsed optical reflectometers before and during vibration exposure. Determine the route of cable laying at the location of the source of directional vibration, in which the difference between the characteristics of backscattering at the place of vibration is maximized. Location of damage to the optical fiber of the cable is determined by the location of the source of the directional vibratory action, in which, on the backscattering characteristics of the optical fiber, the areas on which the damage and the vibration action are identified are the same.

EFFECT: technical result is to expand the field of application.

1 cl, 1 dwg