【作者】 周波；

【导师】 郝燕玲；

【作者基本信息】 哈尔滨工程大学 ， 控制理论与控制工程， 2004， 硕士

【摘要】 随着潜艇消噪声技术的不断提高，迫切需要研制灵敏度极高的探测器对其进行远距离定位，光纤水听器的问世正是适应了这一要求。作为新一代的海域声探测器，光纤水听器必须具有极高的灵敏度和较大的动态范围。 通过严密的数学推导和仿真分析，对直接调制光源产生相位载波的马赫—曾德尔(Mach-Zehnder)和迈克尔逊(Michelson)两种干涉型光纤水听器调制解调技术进行了研究。从理论上详细分析了影响解调信号稳定性的主要因素，提出了不能通过干涉信号的峰值或峰峰值检测来控制自动增益控制(AGC)电路增益的方法消除偏振衰落对输出信号的影响；仿真计算出了贝塞尔函数展开的最佳C值。 在这一思想的指导下完成了相位载波(PGC)零差解调电路各个单元的硬件设计，包括信号的混频，低通滤波，高通滤波，微分，积分，相乘，相减等模拟运算。 最终研制出一套单元干涉型光纤水听器系统，它具有在水声信号频率范围内将感兴趣的信号检测出来的能力，并且该系统对提出的一些理论进行了实验验证。经过中科院声学所和中国国防水声计量站(杭州富阳715所)的测试，得到了较理想的实验测试结果。 通过课题的研究，积累了经验，发现了不足，提出了改进水听器性能的途径和方法。更多还原

【Abstract】 With the improvement of the technology for submarine to eliminate noise, it is urgently to find out a kind of sensor with high sensitivity to orient submarine from long distance. Fiber optic hydrophone is just suit for this request. As a new age of acoustic detector, it must have high sensitivity and large dynamic range.Through rigorous mathematical calculation and simulation, the phase modulation and demodulation of interferometric Mach - Zehnder and Michelson fiber optic hydrophone using phase generated carrier (PGC) technique with direct source modulation is described. The main factors affecting the stability of demodulation signal are particular analyzed in theory. It is found infeasible to overcome the polarization-induced fading influence on output signal through AGC circuits which use peak or peak-peak of interferometric signal detection method to control the gain of AGC circuits. The best bessel function expanded value of C is get through simulation.In this way, the design of unit phase generated carrier (PGC) homodyne demodulation circuits is completed , including analogue operations such as signal mixer, lowpass filter, highpass filter, differentiator, integrator, multiplier, subtracter, and so on.Finally, a single interferometric fiber optic hydrophone system is completed. The system has the ability to detect the interested signals in the frequency range of acoustic signals under water. Simultaneously, some theories are tested and verified on this system. Through the test of Institute of Acoustics , Chinese Academy of Sciences and National defence under water acoustics Metrology Center(the 715 Institute of Hangzhou, Fuyang), the expected experimental results are given out.Through the study on the dissertation, the experience is accumulated and the disadvantages are discovered. The approaches to improve theperformances of the hydrophone are proposed.更多还原