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DFB 光纤激光水听器预应力理论与实验研究

Prestressing Force in DFB Fiber Laser Hydrophone: Theory and Experiment

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摘要

为了研究预应力对分布反馈式(DFB)光纤激光水听器水声探测性能的影响,建立了双膜片结构DFB 光纤激光水听器声压灵敏度与预应力关系的理论模型,运用有限元软件ANSYS 仿真分析了水听器动态性能与预应力的关系,加工制作了不同预应力作用下的DFB 光纤激光水听器原型样品,并在消声水池对其进行了实验研究。实验结果表明,随着预应力的增加,DFB 光纤激光水听器的频率响应趋向平坦,当预应力引起的水听器出光波长变化量增大到400 pm 时,水听器在2.5~10 kHz频率范围内的声压灵敏度为136.8 dB±0.3 dB,而预应力继续增大时,水听器的频率响应曲线变化非常小,这与理论分析和仿真结果都吻合较好。

Abstract

To study the influence of prestressing on distributed feedback (DFB) fiber laser hydrophone in underwater acoustic detection, a theoretical model of DFB fiber laser hydrophone with two diaphragms, which presents the relation between pressure sensitivity and prestressing force, is established. The relation between dynamic performance of hydrophone and prestressing force is simulated and analyzed by finite element software ANSYS. Prototypes of the DFB fiber laser hydrophones under different prestressing forces are fabricated and tested in an anechoic tank. The experimental results show that the frequency response of hydrophone becomes flatter with the increasing of prestressing force. When the wavelength variation induced by prestressing force increases to 400 pm, the acoustic pressure sensitivity of hydrophone is 136.8 dB±0.3 dB in a frequency range from 2.5 kHz to 10 kHz. However, the frequency response curve changes small when prestressing force continues to increase, which agrees well with both the theoretical analysis and simulation results.

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中图分类号:TN253

DOI:10.3788/cjl201643.0305005

所属栏目:光通信

收稿日期:2015-10-26

修改稿日期:2015-11-25

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作者单位    点击查看

唐波:海军工程大学兵器工程系, 湖北 武汉 430033
黄俊斌:海军工程大学兵器工程系, 湖北 武汉 430033
顾宏灿:海军工程大学兵器工程系, 湖北 武汉 430033
毛欣:海军工程大学兵器工程系, 湖北 武汉 430033

联系人作者:唐波(942896945@qq.com)

备注:唐波(1991—),男,博士研究生,主要从事光纤传感技术方面的研究。

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