光学学报, 2017, 37 (4): 0406001, 网络出版: 2017-04-10
分布反馈式光纤激光水听器的声压灵敏度频率响应特性 下载: 561次
Frequency Response Characteristics of Sound Pressure Sensitivity of Distributed Feedback Fiber Laser Hydrophone
光纤光学 分布反馈式光纤激光水听器 增敏 谐振频率 声压灵敏度 fiber optics distributed feedback fiber laser hydrophone sensitivity enhancement resonant frequency sound pressure sensitivity
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.
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. 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.