摘要
基于传统的偏振光时域反射仪架构,以多模光纤作为传感介质,通过偏振降噪方法使振动位置及其后续位置对应的光时域反射曲线迅速收敛,并提出一种用于振动事件定位的信号幅度比值算法。在约10 km长的传感光纤中,获得了小于3 m的定位精度,与常用的逐差定位法相比,新方案的测量效率提升约30%。此外,针对振动事件的频谱分析,提出将信号时域叠加提升振动信号的信噪比,再由快速傅里叶变换提取振动谱的新方法,实验获得的频率精度为0.01 Hz。
Based on the traditional polarization sensitive optical time domain reflectometer(POTDR) architecture, using multi-mode fiber as the sensing medium, the polarization noise reduction method was adopted, which made the optical time domain reflecting trace corresponding to the vibration position and its subsequent position converge rapidly.And an amplitude ratio algorithm for vibration event location was proposed.In an about 10 km long sensing fiber, the positioning accuracy of less than 3 m was obtained.Compared with the commonly used positioning method by trace subtraction, the measurement efficiency of the new scheme is improved by about 30%.In addition, for the spectrum analysis of vibration events, a new signal time-domain superposition method is proposed to improve the signal-to-noise ratio of vibration signals, and then, by fast Fourier transform the vibration spectrum was extracted with the frequency accuracy of 0.01 Hz.
作者
高擎昊
苏幸晨
张成龙
吕立冬
GAO Qing-hao;SU Xing-chen;ZHANG Cheng-long;LYU Li-dong(School of Electrical and Information Engineering,Anhui University of Technology,Maanshan 243032,China)
出处
《仪表技术与传感器》
CSCD
北大核心
2022年第12期108-112,118,共6页
Instrument Technique and Sensor
基金
国家自然科学基金项目(51977001)。
关键词
分布式光纤传感
数据处理与分析
振动事件定位
偏振降噪
比值算法
distributed optical fiber sensing
data processing and analysis
location of vibration event
polarization noise reduction
ratio algorithm
