METHOD FOR FINDING THE ROUTE OF LAYING AN OPTICAL CABLE Russian patent published in 2021 - IPC G01B17/00 G01R31/08 

FIELD: measuring technology.

SUBSTANCE: invention relates to measuring technology, it can be used for finding the route of laying an optical cable. According to the method of finding the route of laying an optical cable, a directional acoustic-vibration effect is created on the cable. The source of the directional acoustic-vibration effect is moved longitudinally and transversely relatively to the intended route of laying the cable and its movements and the level of acoustic-vibration effect are controlled via a separate communication channel. The backscattering characteristic of the optical fiber is measured using a phase-sensitive pulsed optical reflectometer. Two sources of directional acoustic-vibration effect operating at different frequencies are placed above the intended location of the optical cable at a fixed distance from each other, without changing the distance between them. The angle between the straight line connecting the sources and the intended axis of the laying route is changed, achieving the coincidence of the locations of displays of frequency signals of these sources on the backscattering characteristic of the optical fiber, measured by a phase-sensitive pulsed optical reflectometer. Then, without changing the distance between the sources of the directional acoustic-vibration effect and the angle between the straight line connecting them and the intended axis of the laying route, they are moved relatively to the intended cable laying route, achieving equality of levels of frequency signals of the sources of the directional acoustic-vibration effect displayed on the backscattering characteristic of the optical fiber, measured by a phase-sensitive pulsed optical reflectometer. After that, the cable laying route is determined by the location of the axis center between the sources of the directional acoustic-vibration effect, and the direction of the optical cable laying route is determined by the direction of perpendicular line to this axis.

EFFECT: technical result is an extension of the scope of application.

1 cl, 2 dwg