Fusion of distributed fiber optic sensing technology in OPGW power optical cable

Mingchao Nie; Fusheng Zheng; Jun Liu; Fang Chen; Ying Wang; Jian Xu; Ming Li; Shiyu Zhang; Xiao Qin; Xingyun Chen; Xiaojiao Zhang; Jibiao Zhang

doi:10.1117/12.3007303

18 December 2023 Fusion of distributed fiber optic sensing technology in OPGW power optical cable

Mingchao Nie, Fusheng Zheng, Jun Liu, Fang Chen, Ying Wang, Jian Xu, Ming Li, Shiyu Zhang, Xiao Qin, Xingyun Chen, Xiaojiao Zhang, Jibiao Zhang

Author Affiliations +

Proceedings Volume 12968, AOPC 2023: Optic Fiber Gyro ; 129681E (2023) https://doi.org/10.1117/12.3007303
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

OPGW power overhead fiber optic cable suffers from fiber core aging, ice-covering dance and stress damage in long-term operation due to laying method and geographical environment. The monitoring of multi-fiber parameters such as vibration, strain, temperature and attenuation based on distributed fiber optic sensing can realize early warning of malfunction. In order to solve the problems of multiple deployment devices, occupying multiple core resources and high operation and maintenance costs of existing multiparameter measurement technologies, the fusion sensing technology based on ΦOTDR, BOTDR and OTDR is studied. The system employs multiplexing of light sources, two-way coherent reception of Brillouin scattered light and Rayleigh scattered light, and joint demodulation of phase and intensity to achieve distributed measurements of vibration, temperature, strain and long-range attenuation measurement on a single fiber. The system achieves linear reduction of 100Hz perturbation signal with 10m spatial resolution and 80kmsensingdistance, and the signal-to-noise ratio of demodulated vibration signal is about 35dB, and the accuracy of temperature measurement is about ±1°C. For the practical application of OPGW overhead optical fiber cable, the mathematical model of the inherent vibration frequency of the cable and the over-ice tension as well as the stress calibration method of the pole and tower joints are studied to realize the monitoring and early warning of the over-ice thickness of optical fiber cable and the decoupling measurement of BOTDR temperature/strain. The error between the demodulated ice thickness and the actual ice observation result is less than 10%, and the decoupling accuracy of temperature and strain is ±2°C and ±40με respectively.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Mingchao Nie, Fusheng Zheng, Jun Liu, Fang Chen, Ying Wang, Jian Xu, Ming Li, Shiyu Zhang, Xiao Qin, Xingyun Chen, Xiaojiao Zhang, and Jibiao Zhang "Fusion of distributed fiber optic sensing technology in OPGW power optical cable", Proc. SPIE 12968, AOPC 2023: Optic Fiber Gyro , 129681E (18 December 2023); https://doi.org/10.1117/12.3007303

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KEYWORDS

Vibration

Ice

Optical fiber cables

Fiber optics sensors

Optical sensing

Scattered light

Signal attenuation

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