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基于流固耦合作用的分布反馈式光纤激光水听器

DFB Fiber Laser Hydrophone Based on Fluid-structure Interaction

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摘要

为了解决流固耦合模态使水听器工作频带变窄的问题, 理论分析了流体对双膜片结构的分布反馈式光纤激光水听器固有频率的影响, 基于有限元软件对水听器加固封装前后在空气中和流体中的模态和频响性能进行仿真分析, 加工制作了水听器原型样品并开展了水声实验研究.实验结果表明, 在2 500~8 000 Hz的频率范围内, 未经加固封装的水听器由于在该频段内存在多个流固耦合固有频率造成响应曲线起伏较大, 而采取了加固措施封装后的水听器获得了-142.77±0.8 dB的平均声压灵敏度, 验证了流体对水听器频响性能的影响以及改善措施的有效性, 实验结果与理论及仿真结果吻合较好.

Abstract

To solve the problem that fluid-structure coupling mode makes the frequency band of hydrophone narrowed, the influence of fluid on the natural frequency of the distributed feedback fiber laser hydrophone with two diaphragms was theoretically analyzed. Based on the finite element software, the mode and frequency response performance of the hydrophone in the air and fluid before and after the reinforcement were simulated. Prototypes of the hydrophone were fabricated and tested. The results show that response curve of the hydrophone before reinforcement fluctuates greatly due to the existence of several natural frequencies in a frequency range of 2 500~8 000 Hz. The average acoustic pressure sensitivity of the hydrophone reaches -142.77±0.8 dB after reinforcement, which verifies the influence of fluid on the frequency response performance of the hydrophone and the effectiveness of the measures. It agrees well with both the theoretical analysis and simulation results.

Newport宣传-MKS新实验室计划
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中图分类号:TN253

DOI:10.3788/gzxb20174602.0206004

基金项目:"十二五"装备预先研究项目和武器装备探索研究重大项目资助

收稿日期:2016-09-05

修改稿日期:2016-10-19

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

联系人作者:唐波(942896945@qq.com)

备注:唐波(1991-), 男, 博士研究生, 主要研究方向为光纤传感技术.

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引用该论文

TANG Bo,HUANG Jun-bin,GU Hong-can,MAO Xin. DFB Fiber Laser Hydrophone Based on Fluid-structure Interaction[J]. ACTA PHOTONICA SINICA, 2017, 46(2): 0206004

唐波,黄俊斌,顾宏灿,毛欣. 基于流固耦合作用的分布反馈式光纤激光水听器[J]. 光子学报, 2017, 46(2): 0206004

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