分布式保偏光纤偏振耦合应力传感系统的实现  

Implementation of Distributed Polarization Maintaining Fiber Polarization Coupling Pressure Sensing System

作　　者：陈信伟[1] 张红霞[1] 贾大功[1] 刘铁根[1] 张以谟[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室,天津300072

出　　处：《中国激光》2010年第6期1467-1472,共6页Chinese Journal of Lasers

基　　金：国家973计划(2010CB327806);国家自然科学基金(60377031);教育部新教师博士点基金(200800561022);天津市自然科学基金(095CYBJC01300)资助课题

摘　　要：基于保偏光纤(PMF)偏振耦合原理设计了分布式保偏光纤应力传感系统。对一长为1050 m的保偏光纤进行了实验,确定了系统的测量灵敏度和空间分辨率。测试了耦合强度与应力大小的关系及温度对系统的影响。实验结果表明,该传感系统能检测大于1000 m的保偏光纤,测量灵敏度和空间分辨率随光纤长度的增加而逐渐衰减,温度低于100℃时,其波动对测量影响很小。从理论上分析了保偏光纤双折射色散对系统的影响。通过旋转半波片调节检偏器检偏角提高了系统测量灵敏度,通过优化检偏角,系统测量灵敏度为85 dB,最大空间分辨率为98 mm。A distributed polarization maintaining fiber（PMF） pressure sensing system is presented based on polarization mode coupling in PMF.A 1050 m long fiber is tested and the measurement sensitivity and spatial resolution are determined.The relationship between coupling intensity and the size of the force as well as the influence of temperature on the system are tested.The experimental results show that the maximum detectable fiber length is longer than 1000 m.The measurement sensitivity and spatial resolution will decrease with the increase of fiber length.The temperature impact on this sensing system is very small when it is lower than 100 ℃.The influence of birefringence dispersion of the PMF on the system is also analyzed.The measurement sensitivity can be improved by a rotatable half wave plate to adjust the rotation polarization angle of the analyzer.The measurement sensitivity of the sensing system is 85 dB and the maximum spatial resolution is 98 mm by adjusting the rotation polarization angle of the analyzer.

关 键 词：光纤光学 分布式光纤传感器 保偏光纤 偏振模耦合 白光干涉 

分 类 号：TN247[电子电信—物理电子学] TP212.14[自动化与计算机技术—检测技术与自动化装置]