光纤环校正双端探测分布式拉曼光纤传感系统  

Distributed Raman Fiber Sensing System with Fiber-ring Calibration and Double-ended Probe

作　　者：陈福昌[1] 戴杰 余超群[1] 张华林[1] 周锦荣[1] 

机构地区：[1]闽南师范大学物理与信息工程学院,福建漳州363000 [2]中天科技光纤有限公司,江苏南通226009

出　　处：《光电工程》2016年第8期33-38,共6页Opto-Electronic Engineering

基　　金：国家自然科学基金(61405086);福建省教育厅A类(JA14207);漳州市自然科学基金(ZZ2013J02);闽南师范大学新世纪人才(MX13003);闽南师范大学杰出青年计划(SJ12001)

摘　　要：为解决分布式拉曼光纤传感系统中光纤损耗及变化带来的测温误差,提出一种带温控光纤环校正双端注入环形结构的解决方案。该方案从光纤两端分时采集得到反斯托克斯拉曼散射信号相乘并进行几何平均,消除了波长相关损耗和局部损耗带来的影响,并利用温控光纤环实时消除光纤损耗变化带来的测温误差。系统还可在传感光纤断裂后瞬时切换成单端注入模式对整条传感光纤进行温度监测。实验结果表明,系统在15℃~210℃的温度范围内得到0.9℃的测量精度。To eliminate the measurement errors caused by fiber loss and loss variations, a solution employed in Raman distributed fiber sensing system with fiber-ring calibration method and double-ended injection structure is proposed and experimentally demonstrated. Double-ended injection structure adopted in the system eliminates the influence of wavelength-dependent loss and local loss through geometric mean of anti-Stokes Raman scattering signal timesharing obtained from both ends of the sensing fiber. The fiber-ring calibration method is used to correct measurement errors caused by real-time variations of fiber losses. Moreover, with instantaneous switch between double-ended injection structure and single-ended mode, the system can monitor the temperature of the entire fiber even with presence of break point. Experiments show that measurement accuracy of 0.9℃ is obtained within temperature range of 15℃~210℃.

关 键 词：光纤元件 拉曼散射 光纤传感 双端探测 温度传感 

分 类 号：TN247[电子电信—物理电子学] TP212.1[自动化与计算机技术—检测技术与自动化装置]