聚合物封装光纤光栅动态声压增敏有限元分析

摘要

采用有限元法对先纤光栅圆柱型封装结构的动态声压增敏效果进行了分析.结果表明:为使光纤光栅的应变均匀一致,光栅应放在正中间位置,且封装材料应足够长.在动态声压作用下,聚合物的泊松比越小,聚合物的杨氏模量越小,光纤光栅的动态声压的灵敏度越高.随着聚合物外径的增加,光纤光栅的动态声压的灵敏度逐步提高.但当封装聚合物的外径增加到6 mm时,动态声压灵敏度不再增加.%The finite-element analytical model of fiber grating packaged in columned shape structure was presented by using the finite-element analytical software. The result shows that the acoustic pressure sensitivity coefficient (Kp) depends on the Poisson' ratio and Yong modulus of polymer, the dimension of columned shape structure and the location of fiber grating in packaging structure. With the decrease of the Poisson' ratio and Yong modulus of polymer, Kp increases. With the increase of the diameter packaging structure, Kp increases. But when the diameter increases to 6 mm, Kp does not increase any more.