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基于FPGA和锯齿形光谱滤波器的光纤光栅高速解调系统的研究

发布时间:2018-03-31 18:20

  本文选题:光纤布拉格光栅 切入点:FPGA 出处:《北京交通大学》2015年硕士论文


【摘要】:随着光信息科技的飞速发展,光纤传感器技术已经成为国内外专家的研究重点。光纤布拉格光栅已是光纤传感领域的重要光器件,被广泛应用于航天航空、船舶航运、水坝桥梁、隧道建设、石油化工、医学和电磁干扰等领域,而波长解调技术是其应用于传感系统的最关键环节。 本文从光纤光栅传感理论的基本原理出发,对光纤布拉格光栅的解调方案进行了详细分析和研究。提出一种以虚像相位阵列(VIPA)为核心光滤波器件,FPGA进行信号采集与处理的高速波长解调系统。本论文的主要工作如下: (1)从光纤光栅的传感应用出发,对高速波长解调技术的发展状况进行了介绍,分析了光纤光栅传感技术在实际应用的优点和需要解决的问题。深入研究了现有光纤光栅波长解调方法,对解调方案的原理进行了详细阐述,分析了各自的优缺点。 (2)研究了VIPA的理论基础并进行了数值分析,改进并优化了一种基于VIPA的锯齿形光谱滤波器。滤波器的结构改进使其线性度和占空比都得到了较大改善,结构也更加简单,整个光路长度减小到10cm,而且在透射的工作方式下其损耗降低为3dB。 (3)详细介绍了FPGA原理、开发流程和FPGA的硬件描述语言。基于FPGA的高速解调系统的核心光器件使用锯齿形光谱滤波器,并利用差分检测结构提高系统抗干扰能力。使用Verilog语言进行FPGA的程序设计,并在ISE开发平台上对各模块进行了仿真验证。最后搭建实验测试环境,验证了基于FPGA和锯齿形光谱滤波器光纤光栅高速解调系统的功能。
[Abstract]:With the rapid development of optical information technology, fiber optic sensor technology has become the focus of experts at home and abroad. Fiber Bragg grating (FBG) is an important optical device in the field of optical fiber sensing, and has been widely used in aerospace, shipping and shipping. In the fields of dam bridge, tunnel construction, petrochemical industry, medicine and electromagnetic interference, wavelength demodulation technology is the most important part in sensing system. Based on the basic principle of fiber Bragg grating sensing theory, The demodulation scheme of fiber Bragg grating (FBG) is analyzed and studied in detail. A high speed wavelength demodulation system using VIPA as the core optical filter is proposed. The main work of this thesis is as follows:. 1) based on the application of fiber Bragg grating (FBG), the development of high speed wavelength demodulation technology is introduced. The advantages of fiber Bragg grating sensing technology in practical application and the problems to be solved are analyzed. The existing fiber grating wavelength demodulation methods are deeply studied. The principle of the demodulation scheme is described in detail and their advantages and disadvantages are analyzed. In this paper, the theoretical basis of VIPA is studied and numerical analysis is carried out. A sawtooth spectral filter based on VIPA is improved and optimized. The linearity and duty cycle of the filter are greatly improved and the structure is simpler. The length of the whole optical path is reduced to 10 cm, and the loss is reduced to 3 dB in the transmission mode. The principle of FPGA, the development process and the hardware description language of FPGA are introduced in detail. The core optical devices of high speed demodulation system based on FPGA are zigzag spectral filter. The differential detection structure is used to improve the anti-jamming ability of the system. The FPGA program is designed with Verilog language, and each module is simulated and verified on the ISE development platform. Finally, the experimental test environment is built. The function of fiber grating high speed demodulation system based on FPGA and sawtooth spectrum filter is verified.
【学位授予单位】:北京交通大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TN253;TN763

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