压差式光纤矢量水听器频响特性的研究

发布时间：2018-05-24 14:10

本文选题：光纤矢量水听器 + 压差式　；参考：《兰州交通大学》2017年硕士论文

【摘要】：压差式矢量水听器的校准一直是一个较难解决的问题,针对此问题本文设计了一中基于光纤传感的压差式矢量水听器对其传感原理进行了理论分析,并为其设计了驻波场校准方案,对驻波场校准此类压差式矢量水听器进行了理论分析和计算机仿真并作比较。此类研究方法对压差式矢量水听器的应用具有重要的作用和意义。世界各国对海洋资源开发和海洋探测的需要对光纤水听器和水声矢量探测器的研发和应用提供了有力的推动作用。在构成原理上本文所设计的压差式光纤矢量水听器是以Michelson光纤干涉仪为信号传感基础,以顺变柱体和声压感应膜片为矢量水听器的载体,以电信号的分析来解调声场中的声压差以及声场的矢量信息。在传感原理方面,压差式光纤矢量水听器通过顺变柱体两端的声压感应膜片来接受声场中的声压梯度信息或质点振速信息,然后将声场中的压力信息通过顺变柱体传导到顺变柱体并引起顺变柱体的物理性变,进而由缠绕在顺变柱体两端Michelson光纤干涉仪的量光信号传感臂探测到形变信息并将此形变信号转化为光纤干涉仪中的光干涉信号。文章在对顺变柱体在静态条件下应力应变分析的基础上分析了顺变柱体在外界声压作用下的形变方程,并在此基础上分析了压差式光纤矢量水听器顺变柱体膜片复合结构同缠绕光纤之间在外加声压作用下的耦合形变。同时在此基础上推到了矢量水听器的声压-相移灵敏度输出原理,并得到了精确的相移输出公式。随后分析了各设计参数对影响矢量水听器声压-相移灵敏度的影响,并对其一一作了计算机仿真分析,又在此基础上分析了矢量水听器在动态测量条件下的谐振对其矢量测量的影响。最后在前面分析和总结的基础上对其动态条件下的声压-相移灵敏度作了仿真分析,并对影响矢量水听器相移输出的各要素作了详细的讨论和分析,同时在矢量水听器声压-相移灵敏度频率响应分析的基础上分析了在不同条件下矢量水听器的指向性曲线。
[Abstract]:The calibration of pressure differential vector hydrophone is always a difficult problem to solve. In this paper, a pressure differential vector hydrophone based on fiber optic sensor is designed and its sensing principle is analyzed theoretically. The standing wave field calibration scheme is designed, and the theoretical analysis and computer simulation of the pressure differential vector hydrophone calibration for the standing wave field are carried out and compared. This kind of research method has important function and significance to the application of pressure differential vector hydrophone. The development of ocean resources and the need of ocean exploration in the world provide a powerful impetus to the development and application of fiber optic hydrophone and acoustic vector detector. In the principle of constitution, the pressure differential fiber vector hydrophone designed in this paper is based on the Michelson fiber interferometer as the signal sensor, and takes the variable cylinder and the sound pressure induction diaphragm as the vector hydrophone carrier. The signal analysis is used to demodulate the acoustic pressure difference and the vector information of the sound field. In the aspect of sensing principle, the pressure differential fiber vector hydrophone receives the information of sound pressure gradient or particle velocity through the sound pressure inductive diaphragm at the two ends of the variable cylinder. Then the pressure information in the sound field is transmitted through the paramorph cylinder to the paramorph cylinder, which causes the physical change of the paramorph cylinder. Furthermore, the deformation information is detected by the optical signal sensing arm which is wound at the two ends of the Michelson fiber interferometer and converted into the optical interference signal in the optical fiber interferometer. Based on the analysis of stress and strain of paramorph cylinder under static condition, the deformation equation of paramorph cylinder under external sound pressure is analyzed in this paper. On the basis of this, the coupling deformation between the compound structure of the pressure-differential fiber vector hydrophone and the winding fiber under the action of the external sound pressure is analyzed. At the same time, the output principle of the acoustic pressure-phase shift sensitivity of the vector hydrophone is deduced, and the accurate phase shift output formula is obtained. Then, the influence of design parameters on the sensitivity of acoustic pressure-phase shift of the influence vector hydrophone is analyzed, and the computer simulation analysis is done to each of them. On this basis, the effect of the resonance of the vector hydrophone on the vector measurement is analyzed. Finally, on the basis of the previous analysis and summary, the acoustic pressure-phase shift sensitivity under the dynamic condition is simulated, and the factors that affect the phase shift output of the vector hydrophone are discussed and analyzed in detail. At the same time, the directivity curve of vector hydrophone under different conditions is analyzed on the basis of the frequency response analysis of the acoustic pressure-phase shift sensitivity of vector hydrophone.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB565.1

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