同轴干涉型光纤水听器声压灵敏度特性分析

建立了等效模型对含弹性增敏层的同轴干涉型光纤水听器的声压灵敏度进行了理论研究，分析了探头的结构参数和材料特性对声压灵敏度的影响．分析表明，水听器的声压灵敏度随缠绕光纤长度和芯轴长度的增加而增加，随骨架厚度和增敏层的厚度比例的减小而增大，同时采用杨氏模量和泊松系数小的增敏材料能够提高灵敏度．得到了提高探头声压灵敏度的有效途径，并制作了一系列光纤水听器样品，对理论分析结果进行了实验验证，理论分析结果与实验结果基本吻合．

Research on the Pressure Sensitivity of the Interferometric Fiber-Optic Hydrophone with a Concentric Mandrel

An equivalent model was constructed to study the pressure sensitivity of the interferometric fiber-optic hydrophone with a concentric mandrel.The composite mandrel consists of double layers(an enhanced sensitivity layer on top of a frame) and a center hole.The effects of structural parameters and material properties on the pressure sensitivity were analyzed.The analysis results show that the pressure sensitivity of a hydrophone increases in relation to the length of the fiber and the mandrel.The sensitivity also increases with the smaller ratio of the thickness of frame to the enhanced sensitivity layer.A higher pressure sensitivity requires an enhanced sensitivity material with a relatively low Young's modulus and Poisson's ratio too.And the effective means to enhance the sensitivity are obtained.A series of fiber-optic hydrophone samples are made to verify the theoretic analysis.And the results derived from theoretic analysis agree with those observed in experiments.