光纖電場傳感器的有限元分析

介紹了具有壓電聚合物護套的光纖電場傳感器的有限元分析, 這種光纖電場傳感器能響應(yīng)100Hz至50MHz 的頻率。采用有限元分析可以預(yù)知低頻段(軸向非約束) 0. 019rad?(V ·m ) 的相位偏移和在高頻段(軸向約束) 8. 2×10- 4 rad?(V ·m ) 的相位偏移。當(dāng)頻率高于7MHz 時, 光學(xué)響應(yīng)主要是光纖和聚合物護套組合材料的徑向諧振。模擬預(yù)測的諧振尖峰和合成理論推算出的諧振尖峰具有很好的一致性。
[關(guān)鍵詞]　有限元分析; 光纖電場傳感器; 壓電聚合物護套
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. 019rad?(V ·m ) in the low fre2 quency (axially unconst rained) region and 8. 2×10- 4 rad?(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