基于拉曼散射的分布式OPGW温度测量

On Distributed Temperature Measurement of OPGW Based on Raman Scattering

光纤复合架空地线(OPGW)运行状态的有效掌握一直是生产运行单位十分关注的问题.介绍了基于拉曼散射的OPGW的沿线温度测量方法.通过对OPGW进行模拟雷击实验,对OPGW中光纤的后向拉曼散射光信号进行波分复用、光电转换及电压信号的采集和处理,实现了高精度、分布式OPGW温度测量,试验温度测量误差约为0.2℃,该技术可以应用于输电线路中OPGW的温度在线监测中.

The operation and environmental condition of optical fiber composite overhear ground wire（OPGW）has always been the concerns of operation branch of power supply.The distributed temperature measurement of OPGW based on the Raman scattering has been introduced in this paper.During the temperature measurement,simulated lightning experiment of OPGW has been carried out.The Raman back scattering signals in the fiber of OPGW have been obtained through the wavelength division multiplexer and the photoelectric converter.The corresponding electrical signals have been sampled by the A/D converter and processed in the signal processing unit to achieve accurate temperature of OPGW.The measured results show that the accurate temperatures along OPGW can be obtained by using the proposed method.The measured temperature error is about 0.2℃,which indicates the proposed method can be applied in on-line monitoring the OPGW of transmission lines.