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基于混合粒子群算法的ZnO镀膜光纤传感器的参数优化

The Parameter Optimization of Optical Fiber Sensor with ZnO Coating Based on Hybrid Particle Swarm Optimization

作者: 专业:通信与信息系统 导师:周力 年度:2010 学位:硕士  院校: 南昌航空大学

Keywords

Acousto-optic Devices, Hybrid Particle Swarm Optimization, ZnO Coating, Reflection Coefficient, coupling efficiency

        为适应光纤通信、光纤传感技术发展的需要,光纤声光器件成为了现代光纤通信的研究热点,它对光纤传输系统的发展有着重要的促进作用。本文主要对ZnO镀膜光纤传感器进行了研究。该器件具有结构简单,驱动能量低,工作频率范围大等优点。提高器件的功率耦合效率是制作该类声光器件的一大难题,关键在于解决器件参数的匹配问题。本文致力于研究ZnO镀膜光纤器件各参数对传输系统的影响,通过遗传算法(Genetic Algorithm)、粒子群算法(Particle Swarm Optimization)和混合粒子群算法(Hybrid Particle Swarm Optimization)对器件各参数进行优化。主要取得了以下成果:1、在已有的研究基础上,(1)分析了反射系数与频率、谐振腔长度、压电层厚度等八个参数之间的关系。(2)分析了器件参数对耦合效率的影响。(3)通过仿真图对比了优化前后器件参数对反射系数及耦合效率的影响。2、在器件相位偏移研究方面,(1)研究了ZnO压电层镀膜光纤传感器的相位偏移,从理论上推导出了压电层在外加电场作用下产生声光作用的机理,求出了光信号通过该段镀膜光纤时所产生的相位偏移的数学模型。(2)将优化后的最大相移仿真值与优化前的实验值进行了比较和分析。3、在参数优化方面,(1)建立了反射系数与声功率耦合效率目标优化模型。(2)实现了GA算法、PSO算法和HPSO算法对目标函数的优化。(3)得到了三种算法对目标函数优化后的参数结果,并对优化结果进行了综合比较。通过仿真得出的一系列器件参数数据,为ZnO镀膜光纤声光相位传感器的制作提供了理论参考。
    The acousto-optic devices have being focused by researchers in optical fiber communications. This thesis studies the ZnO coated optical fiber sensor which has many advantages such as simple structure, low driving energy, large operating frequency range and so on. How to improve the device’s power coupling efficiency is a difficult work in making such acousto-optic devices, and the key point is to solve the problem of the device’s parameter matching.The influence of ZnO coated optical fiber sensor’s parameters on the transmission system was investigated, and the parameters were optimized with genetic algorithm, particle swarm optimization and hybrid particle swarm optimization. The following results have been achieved:Firstly, the relationships among eight parameters such as the reflection coefficient and frequency, the resonator length and piezoelectric layer thickness et al. were analyzed; the impact of device parameters on coupling efficiency was studied; the effect of device parameters on coupling efficiency was compared before and after optimization with simulation experiments.Secondly, the phase shift of an optical fiber sensor with ZnO coating as piezoelectric film was studied intensively; the acousto-optic effect of the device resulting from the application of an electrical signal to the piezoelectric film was analyzed in theory; the phase shift of light traveling through this part of fiber was obtained mathematically and the maximum phase shift simulation results after optimization and experimental results before optimization are compared and analyzed.Thirdly, the objective optimization model for power coupling efficiency was established; the optimization of the model was implemented with genetic algorithm, particle swarm algorithm and hybrid particle swarm algorithm; the optimized results were compared and a set of optics parameters data was obtained from the simulation results, which could provide the theoretical references for the fabrication of the practical fiber sensor with piezoelectric ZnO coating.
        

基于混合粒子群算法的ZnO镀膜光纤传感器的参数优化

摘要5-6
ABSTRACT6
第1章 绪论9-14
    1.1 课题背景及意义9-10
    1.2 国内外研究现状10-12
        1.2.1 声光器件国内外研究现状10-11
        1.2.2 粒子群算法国内外研究现状11-12
    1.3 论文内容介绍12-14
第2章 声光相位传感器的数学模型14-27
    2.1 块状声光器件模型14-20
        2.1.1 非压电平板的一维等式14-16
        2.1.2 压电平板的一维等式16-19
        2.1.3 输入阻抗近似表达19-20
    2.2 柱状声光相位传感器模型20-26
        2.2.1 等效电路21-24
        2.2.2 网络模型24-26
    2.3 本章小结26-27
第3章 遗传算法与粒子群优化算法原理27-35
    3.1 遗传算法原理27-29
        3.1.1 遗传算法常用术语27
        3.1.2 遗传算法基本要素27-28
        3.1.3 遗传算法的参数设定28
        3.1.4 遗传算法步骤及流程图28-29
    3.2 粒子群算法原理29-32
        3.2.1 基本粒子群算法29-30
        3.2.2 基本PSO 算法的参数设定30
        3.2.3 基本PSO 算法步骤及流程图30-32
    3.3 PSO 算法的改进32-34
        3.3.1 标准PSO 算法32
        3.3.2 带有收缩因子的PSO 算法32-33
        3.3.3 混合粒子群算法33-34
    3.4 本章小结34-35
第4章 ZnO 镀膜光纤器件反射系数参数优化35-47
    4.1 ZnO 镀膜光纤器件反射系数网络模型35-37
    4.2 基于HPSO 算法的反射系数参数优化37-40
        4.2.1 目标函数的建立37-38
        4.2.2 HPSO 算法的实现38-40
    4.3 仿真结果及参数分析40-46
        4.3.1 仿真结果40-41
        4.3.2 ZnO 镀膜光纤传感器参数对反射系数的影响41-46
    4.4 本章小结46-47
第5章 ZnO 镀膜光纤器件功率耦合效率与相位偏移参数优化47-59
    5.1 声功率耦合效率模型47-49
    5.2 声光器件总相位偏移49-50
    5.3 功率耦合效率与相位偏移参数优化结果及分析50-55
        5.3.1 功率耦合效率与相位偏移参数优化结果50-51
        5.3.2 器件参数对功率耦合效率的影响51-55
    5.4 器件最大相移实验结果及分析55-57
    5.5 本章小结57-59
第6章 总结与展望59-61
    6.1 研究工作总结59-60
    6.2 展望60-61
参考文献61-66
研究生期间研究成果66-67
致谢67-68
附录一 HPSO 优化后的器件反射系数和参数值68-69
附录二 HPSO 优化后的器件功率耦合系数和参数值69-70
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