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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 k Hz频率范围内的声压灵敏度为136.8 d B±0.3 d B,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。
In order to study the effect of prestress on the underwater acoustic detection performance of DFB fiber laser hydrophone, a theoretical model of the relationship between the acoustic pressure sensitivity and prestress of DFB fiber laser hydrophone is established. By using the finite element software ANSYS simulation analysis of the hydrophone dynamic properties and the relationship between prestressed, processed and produced under different prestressed DFB fiber laser hydrophone prototype samples, and in the anechoic tank of its experimental study. The experimental results show that with the increase of prestress, the frequency response of DFB optical fiber laser hydrophone tends to be flat. When the change of wavelength of hydrophone caused by prestress increases to 400 pm, The sound pressure sensitivity in the frequency range of Hz is 136.8 d B ± 0.3 d B, while the frequency response curve of the hydrophone changes little when the prestress increases. This is in good agreement with the theoretical analysis and simulation results.