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为了进一步拓宽端面拉伸增敏的分布反馈式(DFB)光纤激光水听器的工作频带,研制了一种外径为13mm的聚氨酯端面拉伸式增敏结构的DFB光纤激光水听器,建立了其声压灵敏度与聚氨酯材料参数的理论模型,仿真分析了水听器的动态特性与聚氨酯材料参数的关系,并制备了参数经过优化后的双组分聚氨酯材料,制作了水听器原型样品并进行了水声实验研究。实验测得,研制的聚氨酯端面拉伸式增敏结构的DFB光纤激光水听器在10~20000Hz的宽频带内获得了(-137.60±2)dB的声压灵敏度,表明聚氨酯端面增敏式封装有效地拓宽了水听器的工作频带,很好地满足拖曳线列阵的工程化应用要求。
In order to further broaden the working band of DFB fiber laser hydrophone, a DFB fiber laser hydrophone with a 13 mm diameter polyurethane end-face stretch sensitizing structure was developed. The theoretical model of the sound pressure sensitivity and the polyurethane material parameters was simulated. The relationship between the dynamic characteristics of the hydrophone and the parameters of the polyurethane material was simulated and the biphasic polyurethane material with the optimized parameters was prepared. Prototype samples of hydrophone And carried out underwater acoustic experiment. The experimental results show that the DFB optical fiber laser hydrophone developed by polyurethane end-face stretch-sensitized structure achieves the acoustic pressure sensitivity of (-137.60 ± 2) dB in the wideband of 10 ~ 20000Hz, which shows that the polyurethane end-face sensitized package Effectively widen the working frequency band of the hydrophone and meet the engineering application requirements of the towed line array well.