芯轴型光纤水听器频率特性研究

提出了一种带空气腔芯轴型光纤水听器的结构模型,并对其频率特性作出研究.通过对带空气腔芯轴型光纤水听器的基本原理和结构进行分析,得出光纤与弹性筒作用的相互关系；通过建立动力学等效模型,得出带空气腔芯轴型光纤水听器频率特性的理论模型.通过对各个参量进行分析,指出芯轴型光纤水听器频率特性的主要制约因素与改善方法.根据提出的结构,在一定参量下的制作出探头,经过试验测试,其3 dB带宽达到了30 kHz左右,验证了提出的模型理论.

Frequency Characters of the Air-backed Mandrel Fiber-optic Hydrophone

A structure model of the air-backed fiber-optic hydrophone was proposed and the frequency characters of the hydrophone were investigated.The interaction relation between optical fiber and elastic tube was gained by the analyses of the principle and basic structure of the air-backed mandrel hydrophone.Then the theoretical model of the resonance frequency was obtained by creating the dynamics model.On the basis of the analysis of the parameters of the model,main restrictively factors and the improved methods were proposed.According to structure which was proposed,the mandrel fiber-optic hydrophone was produced with determined parameters,and the 3dB bandwidth achieves about 30kHz in the test,so the results validate the theory model.