摘要
采用有限元法建立了熊猫光纤光栅的压力传感模型,分析了压力变化所导致的内部应力分布。结果表明,熊猫光纤光栅双峰间距随着压力增加而增大,其快轴方向的压力灵敏度系数为-4.08 pm/MPa,其绝对值大于慢轴方向-3.5 pm/MPa。理论分析和实验测量了几何结构对压力传感特性的影响规律,结果表明,熊猫光纤光栅压力灵敏度系数与猫眼半径距离比的平方成线性关系。对比实验结果表明,无法通过测量熊猫光纤光栅双峰间距的方案实现对温度不敏感的压力传感测量。
The pressure sensing mode of panda fiber gratings is built using the finite element method and the stress distribution induced by pressure is analyzed. The experimental results show that the peak separation of Panda fiber gratings increases with pressure, and -- 4.08 pm/MPa the pressure sensitivity along fast axis is stronger than that -- 3.5 pm/MPa along slow. The influence of fiber structure on pressure sensing characteristics is studied through theoretical calculation and experimental measurement, and the results show that the pressure sensing coefficients of panda fiber gratings are linear with the square of the ratio of radius to distance of stress applied zone. The contrastive experimental results show that the Panda fiber grating cannot be used to measure thermally-insensitive pressure through testing its peak separation.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2009年第1期157-162,共6页
Acta Optica Sinica
基金
国家自然科学基金(60507010)资助课题
关键词
光纤光学
熊猫光纤光栅
压力传感
有限元法
fiber optics
Panda fiber grating
pressure sensing
finite element method
