光纤电场传感器的有限元分析

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100Hz至50MHz 的频率。采用有限元分析可以预知低频段(轴向非约束) 0. 019radö(V ·m ) 的相位偏移和在高频段(轴向约束) 8. 2×10- 4 radö(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。模拟预测的谐振尖峰和合成理论推算出的谐振尖峰具有很好的一致性。
[关键词]　有限元分析; 光纤电场传感器; 压电聚合物护套
Abstract: A novel FEA app roach fo r analyzing a fiber op t ic elect ric field senso r w h ich has a t ransversely po lar2 ized p iezoelect ric po ly (vinylidene fluo ride) po lymer coat ing is p resented. The response of the fiber op t ic elect ric field senso r is ranged from 100Hz to 50MHz. The modeling p redicts a phase sh ift of 0. 019radö(V ·m ) in the low fre2 quency (axially unconst rained) region and 8. 2×10- 4 radö(V ·m ) in the h igh frequency (axially const rained) re2 gion. A t frequencies h igher than 7MHz the op t ical response is dom inated by radial resonance of the fiber2jacket compo site. Good agreement exists betw een the resonance peak s p redicted by the simulat ion and tho se theo ret ically calculated using compo site theo ry.
Key words: finite element analysis (FEA ) ; fiber op t ic elect ric field senso r; p iezoelect ric po lymer coat ing