柔顺型光纤光栅水听器阵列理论与实验研究

Theoretical and experimental research on flexible fiber grating hydrophone array

为提升光纤水听器拖曳线阵列的适装性,提出一种柔顺型光纤光栅水听器阵列。根据力学理论模型计算3种柔顺型光纤光栅水听器声压灵敏度,比较分析其影响因素,通过有限元仿真进行频响分析,研制了直径分别为10 mm、12 mm和16 mm的2元柔顺型光纤光栅水听器样阵,采用振动液柱法实验测试其灵敏度。实验结果表明:柔顺型光纤光栅水听器在200~800 Hz的频率范围内响应平坦,不同结构参数的水听器阵列平均声压灵敏度分别为-138.90 dB、-134.71 dB、-136.12 dB,验证了理论与仿真分析的正确性。按照本文的设计,通过进一步优化材料和结构参数,采用弱反射光纤光栅,可以构建数百阵元的一体化柔顺型水听器阵列。

In order to improve the suitability of the fiber hydrophone towing line array,a flexible fiber grat-ing hydrophone array was proposed.The sound pressure sensitivity of three flexible fiber grating hydro-phones was calculated according to the mechanical theoretical model,and the influence factors were com-pared and analyzed.2-element flexible fiber hydrophone sample arrays with diameters of 10 mm,12 mm and 16 mm were developed through finite element simulation for frequency response analysis.The sensitivity was measured by a vibration liquid column experiment.The experimental results show that the response is flat within the frequency range of 200~800 Hz,and the average sound pressure sensitivities of the hydro-phone arays with different structural parameters are-138 p0 dB,-134.71 dB,and-136.12 dB,respectively.The theory and simulation analysis are verified.By further optimizing the material and structure parameters and using weak reflection fiber grating,an integrated flexible hydrophone aray with hundreds of elements can be constructed according to the design in this paper.