Long distance Brillouin optical time domain reflectometer (BOTDR) sensing system based on bypass remote optical pumped amplifier, Erbium-doped fiber and backward Raman amplification, is achieved 253km sensing distance with 40m spatial resolution.
This paper proposes a Brillouin and Rayleigh fusion system for multi-parameter monitoring of power OPGW cables. Temperature, strain, and vibration measurements are important indicators for safe cable operation of OPGW cables. Temperature monitoring helps detect ice-coating, mountain fire, and lightning. Strain measures cable stress, fiber core safety, ice-coating, and fatigue damage caused by wind-induced vibrations. Vibration monitoring is useful for ice covering and wind vibration. The proposed system overcomes limitations such as nonlinear effects and limited sensing distance. By using a fixed delay of 500ns, mutual position calibration of temperature/strain and vibration measurements is achieved. The system uses a two-wavelength distributed optical fiber fusion scheme with dual light sources, ensuring no interference or degradation due to index conflicts.
Aiming at the current demand for precise fault location and early warning of power OPGW optical cables, a method of OPGW optical cable fault location and early warning based on BOTDR/A technology is proposed. This paper proposes a method for locating the connection pole based on the DBSCAN algorithm. The connection point is located through the Brillouin frequency shift curve, and then the fault is accurately located. The Brillouin frequency shift is linearly affected by temperature and strain, which are linear relationships and cross-sensitive. The isolation of the OPGW cable strain and temperature is achieved by the identification result of the fiber optic splicing point. The abnormal region is positioned and warned by strain measurement. Field picture collections are performed for typical abnormal strain areas, and the positioning and cause of fault warning is confirmed. The OPGW fault positioning and early warning method proposed herein, significantly improves the efficiency of fault processing and improves the operational reliability of OPGW optical cables.
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