基于光纤分布式传感器的时频定位技术.pdfVIP

学兔兔 第35卷 第10期 仪 器 仪 表 学 报 Vo1．35 No．10 2014年10月 Chinese Journal of Scientific Instrument 0ct．2014 基于光纤分布式传感器的时频定位技术水 徐 锲，许海燕，宋耀华，肖 倩 (复旦大学材料科学系 上海 200433) 摘 要：光纤单芯分布式传感系统可对传感线路上的扰动信号进行检测与定位，特别适合各种长距离的管道监控，如油管监控。 传统的频域定位算法，依靠单独的几个频率点，有一定的局限性，并且如果扰动源未激发出所需要的频率范围，就无法获得频率 缺失点，这种判断方法就会失效。提出了一种简单的时域定位算法，与频域算法进行互补，提高了系统的稳定性和普适性。 关键词：分布式光纤传感器；干涉；时域定位；单芯；75管监控 中图分类号：TP212．1 TH744 文献标识码：A 国家标准学科分类代码：460．4020 Positioning technique based on time-frequency domain method in distributed fiber optic system Xu Qie，Xu Haiyan，Song Yaohua，Xiao Qian (Department ofMaterials Science，Fudan Unwe~ity，Shanghai 200433，China) Abstract：A distributed single core fiber optic sensing system is used as an intrusion detection system for locating and identifying signal disturbance．While conventional method for positioning has been widely used in detecting and identi~ing locations，it still has some limi— tations because of requiring a given~equency range．For example，if the signals excited by intrusions dont lie within a given~equency range，then it is not possible to obtain the fault~equency with the conventional method．Accordingly，it is the object of the invention to provide a simple method for positioning for the system．The time domain method for positioning proposed in this paper not only can con- plement the conventional method in~equeney domain，but also has higher efficiency and accuracy．All in all，this time—domain positio- ning method complements the weakness of the~equency—domain method and enhances its stability and general adaptability． Keywords：distributed optical fiber sensor；interference；t