Fast Measurement Method for Temperature and Strain of Transmission Lines Based on Distributed Optical Fiber Sensor

被引：0
|
作者：
Xu Z. [1 ]
Fan M. [1 ]
Zhao L. [1 ]
Hu Y. [1 ]
Wang H. [1 ]
Che X. [1 ]
机构：
[1] School of Electrical and Electronic Engineering, North China Electric Power University, Baoding
来源：
Zhao, Lijuan (hdzlj@126.com) | 1600年 / Science Press卷 / 46期
基金：
中国国家自然科学基金;
关键词：
Brillouin scattering; Distributed optical fiber sensing; Double slope-assisted technique; Fast measurement; Strain; Temperature; Transmission line;
D O I：
10.13336/j.1003-6520.hve.20200792
中图分类号：
学科分类号：
摘要：
To improve real-time performance of temperature and strain measurement for transmission lines by use of Bril-louin-scattering-based distributed optical fiber sensor, and to lay the foundation for vibration measurement based on distributed optical fiber sensing, the slope-assisted techniques are used to measure the temperature and strain of transmission lines. The Brillouin spectrum model is introduced. Based on the measured Brillouin spectra along bare optical fibers, optical fiber composite overhead ground wires (OPGW), and optical fiber composite submarine power cables, the performances of the spectrum fitting method, slope-assisted technique, and double slope-assisted technique are systematically compared. Based on the numerically generated and measured Brillouin spectra along optical fibers, the influences of working point and signal-to-noise ratio (SNR) on the BFS error estimated by the double slope-assisted technique is investigated. The results reveal that the optimal left and right working points of the double slope-assisted technique are vB0±ΔvB/2, where vB0 and ΔvB respectively are the mean BFS along the optical fiber and the linewidth. BFS error exponentially decreases with SNR. If SNR is high (≥30 dB) and BFS variation along optical fiber is low (significantly less than ΔvB), the slope-assisted techniques have similar accuracy with the spectrum fitting method. The measurement time of the slope-assisted techniques is much shorter than that of the spectrum fitting method. The accuracy of the double slope-assisted technique is higher than that of the slope-assisted technique. The vibration measurement for a short fiber under test can be conducted by the slope-assisted techniques and it can avoid the problem of measurement uncertainty of the φ-OTDR (phase-sensitive optical time domain reflectometer). © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：3124 / 3134
页数：10
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