中文摘要：

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。

英文摘要：

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.