中文摘要：

利用光纤光栅的偏振特性感知外界参量变化是光纤光栅传感的新研究热点。提出利用光纤光栅第一斯托克斯参量s1感知外界压力的新方法。推导了光纤光栅压力所致线双折射和s1参量的关系,建立了压力、线双折射和s1参量三者之间的关系模型,分析了线偏振光入射角度对s1参量的影响。仿真表明,偏振光入射角度影响s1曲线的基准值,同时也影响左右波长测量点的对称性和线性度。利用光纤光栅和高速在线检偏器搭建了实时压力测量系统,测量了不同偏振光入射角度下s1参量受压力所致线双折射的影响曲线,验证了理论仿真结果。

英文摘要：

Polarization properties of gratings become a research hotspot of fiber Bragg grating based sensors.A new pressure measurement method based on the first normalized Stokes parameter s1 is analyzed.The relationship between s1 parameter and linear birefringence is studied and the causal model of s1 parameter,linear birefringence and pressure is given.The effects on s1 parameter of incident angles of linearly polarized light are researched.The results show that the base value and linearity of s1 parameter are affected by the incident angles of linearly polarized light.A real-time pressure measurement system with fiber Bragg gratings and in-line polarimeter is set up.The curves of s1 parameter with different pressure values are measured and the feasibility of the theory is proved.