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分布反馈式光纤激光水听器的声压灵敏度频率响应特性

Frequency Response Characteristics of Sound Pressure Sensitivity of Distributed Feedback Fiber Laser Hydrophone

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摘要

光纤激光水听器的频率响应曲线会在声压传递函数的谐振频率处出现谐振峰,使水听器的工作频带变窄。研制了一种金属膜片端面增敏结构的分布反馈式(DFB)光纤激光水听器。基于电声类比理论,建立了DFB光纤激光水听器的声压传递函数模型,仿真分析了水听器各结构参数对水听器声压传递函数的影响,实现了水听器结构的优化设计,加工制作了水听器原型样品并进行了实验研究。由实验结果可知,DFB光纤激光水听器在2.5~10 kHz 频率范围内的平均声压灵敏度为-135.99 dB,波动幅度小于±0.6 dB,且在16 kHz附近出现谐振峰,实验结果与仿真分析结果较好地吻合。该研究对DFB光纤激光水听器的研制具有重要指导意义。

Abstract

Some resonant peaks in the frequency response curve of fiber laser hydrophone appear at the resonant frequency of sound pressure transfer function, which makes the working frequency band narrow. A distributed feedback (DFB) fiber laser hydrophone is designed with a sensitivity enhanced mental diaphragm structure. A sound pressure transfer function model of the DFB fiber laser hydrophone is established based on electro-acoustic theory. The influence of structural parameters of hydrophone on sound pressure transfer function is simulated, and the structure of hydrophone is optimized. Prototypes of hydrophones are fabricated and tested experimentally. The experimental results show that the average sound pressure sensitivity of the DFB fiber laser hydrophone can reach to -135.99 dB with the fluctuation range within ±0.6 dB in the frequency range of 2.5-10 kHz, and the resonant peak appears near the frequency of 16 kHz. The experimental results agree well with the simulation results. The study is of great guiding significance for the development of DFB fiber laser hydrophone.

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中图分类号:TN253

DOI:10.3788/aos201737.0406001

所属栏目:光纤光学与光通信

收稿日期:2016-11-02

修改稿日期:2016-12-04

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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,主要从事光纤传感方面的研究。

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引用该论文

Tang Bo,Huang Junbin,Gu Hongcan,Mao Xin. Frequency Response Characteristics of Sound Pressure Sensitivity of Distributed Feedback Fiber Laser Hydrophone[J]. Acta Optica Sinica, 2017, 37(4): 0406001

唐波,黄俊斌,顾宏灿,毛欣. 分布反馈式光纤激光水听器的声压灵敏度频率响应特性[J]. 光学学报, 2017, 37(4): 0406001

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