中国激光, 2012, 39 (8): 0805004, 网络出版: 2012-07-17
一种基于相位敏感光时域反射计的多参量振动传感器
Multi-Parameter Vibration Detection System Based on Phase Sensitive Optical Time Domain Reflectometer
传感器 相位敏感光时域反射计 光纤传感 相干检测 维纳滤波 sensors optical time domain reflectometer fiber sensor coherent detection Wiener filter
摘要
提出了一种基于数字相干检测和维纳滤波技术的相位敏感光时域反射计(φ-OTDR)。在该技术中，实时解调出了沿光纤链路散射回的瑞利信号电场的振幅和相位。通过分析解调出的振幅和相位，检测到了位于3.5 km传感光纤上的一个由压电陶瓷(PZT)所产生的正弦振动信号的位置、频率和强度。应用维纳滤波降低了由激光器的相位噪声和探测器加性噪声引起的相位波动。系统的空间分辨率为5 m。
Abstract
A phase sensitive optical time domain reflectometer (OTDR) technology based on the digital coherent detection and Wiener filter is proposed and analyzed, in which the phase and amplitude of the Rayleigh scatting light along the fiber link can be demodulated in real time. Using the proposed method, the vibration position, frequency and intensity for a sinusoidal disturbance signal driven by a lead zirconate titanate (PZT) on a 3.5 km single mode fiber link are obtained exactly. Wiener filter is used to reduce the laser phase noise and additive noise caused the phase fluctuation. A spatial resolution of 5 m for the system is realized.
梁可桢, 潘政清, 周俊, 叶青, 蔡海文, 瞿荣辉. 一种基于相位敏感光时域反射计的多参量振动传感器[J]. 中国激光, 2012, 39(8): 0805004. Liang Kezhen, Pan Zhengqing, Zhou Jun, Ye Qing, Cai Haiwen, Qu Ronghui. Multi-Parameter Vibration Detection System Based on Phase Sensitive Optical Time Domain Reflectometer[J]. Chinese Journal of Lasers, 2012, 39(8): 0805004.
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