光纤电场传感器的有限元分析

Finite element analysis of fiber optic electric field sensor

介绍了具有压电聚合物护套的光纤电场传感器的有限元分析 ,这种光纤电场传感器能响应 10 0 Hz至 5 0 MHz的频率。采用有限元分析可以预知低频段 (轴向非约束 ) 0 .0 19rad/(V· m )的相位偏移和在高频段 (轴向约束 ) 8.2× 10 - 4rad/(V· m)的相位偏移。当频率高于 7MHz时 ,光学响应主要是光纤和聚合物护套组合材料的径向谐振。

A novel FEA approach for analyzing a fiber optic electric field sensor which has a transversely polarized piezoelectric poly(vinylidene fluoride) polymer coating is presented. The response of the fiber optic electric field sensor is ranged from 100Hz to 50MHz. The modeling predicts a phase shift of 0.019rad/(V·m) in the low frequency (axially unconstrained) region and 8.2×10 -4 rad/(V·m) in the high frequency (axially constrained) region. At frequencies higher than 7 MHz the optical response is dominated by radial resonance of the fiber jacket composite. Good agreement exists between the resonance peaks predicted by the simulation and those theoretically calculated using composite theory.