电力工程技术2025，Vol.44Issue(3)：211-218,8.DOI:10.12158/j.2096-3203.2025.03.020
基于移动方差平均与谱减法的通信光缆Φ-OTDR扰动定位
Φ-OTDR disturbance localization of communication optical cable based on moving variance average and spectral subtraction
沈伟 1胡欣 1张泽 1鞠玲 1吴健 1黄怿2
作者信息
- 1. 国网江苏省电力有限公司泰州供电分公司,江苏 泰州 225300
- 2. 上海大学特种光纤与光接入网重点实验室,上海 200444
- 折叠
摘要
Abstract
To address the issue of low signal-to-noise ratio in disturbance localization on power communication optical cables caused by environmental noise in phase sensitive-optical time domain reflectometry(Φ-OTDR)systems,the Φ-OTDR localization technique is investigated based on moving variance averaging and spectral subtraction.A coherent detection Φ-OTDR system is built to connect optical fibers and optical cables to carry out galloping simulation experiments.The backward Rayleigh scattering signal is acquired by using the system and the scattering signal is demodulated to obtain the amplitude signal curve.By selecting an appropriate number of curves and an optimal step size,the amplitude signal curves are processed using moving variance average to generate a preliminary disturbance localization map.To suppress ambient noise outside the localization region,noise reduction using spectral subtraction is performed to achieve enhanced localization.A comparative analysis is conducted between spectral subtraction and two alternative noise reduction methods-wavelet decomposition and empirical mode decomposition.The results demonstrate that spectral subtraction significantly outperforms the other two algorithms in localization effectiveness,achieving an SNR improvement exceeding 20 dB while maintaining a computational time as low as 0.58 s.关键词
光缆监测/相位敏感光时域反射(Φ-OTDR)系统/扰动定位/幅度信号/移动方差平均/谱减法Key words
optical cable monitoring/phase sensitive-optical time domain reflectometry(Φ-OTDR)system/disturbance localization/amplitude signal/moving variance average/spectral subtraction分类
信息技术与安全科学引用本文复制引用
沈伟,胡欣,张泽,鞠玲,吴健,黄怿..基于移动方差平均与谱减法的通信光缆Φ-OTDR扰动定位[J].电力工程技术,2025,44(3):211-218,8.
