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提出了基于光纤光栅透射光斯托克斯参量测量的新型实时压力传感方法。深入分析了透射光第一斯托克斯参量和压力所致线双折射之间的单调变化关系。分析表明,入射线偏振光入射角度以及相应测量波长点的选择对系统灵敏度、线性度及动态范围有重要影响。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,实验数据验证了压力和透射光第一斯托克斯参量之间的单调变化关系,证明了此方法的可行性。最后对实验误差和系统性能进行了分析并提出了改进方案。
A new real-time pressure sensing method based on Stokes parameter measurement of FBG transmission was proposed. The relationship between the first Stokes parameter of transmitted light and the linear birefringence caused by pressure is deeply analyzed. The analysis shows that the incident angle of incident linearly polarized light and the choice of the corresponding measurement wavelength point have an important influence on the system sensitivity, linearity and dynamic range. The real-time pressure measurement system was constructed by using fiber grating and high-speed on-line analyzer. The experimental data verified the monotonous relationship between the pressure and the first Stokes parameter of transmitted light, which proves the feasibility of this method. Finally, the experimental error and system performance are analyzed and the improvement plan is proposed.