【作者】 赵岚；

【导师】 郑绳楦； 毕卫红；

【作者基本信息】 燕山大学 ， 电路与系统， 2006， 硕士

【摘要】 干涉型光纤传感器具有灵敏度高,线性好,动态范围大等很多优点,已成为光纤传感器研究领域的一个重要组成部分,它具有多种结构和机理。其中基于白光干涉原理的干涉型光纤电压传感器,是近年来人们广为关注的课题。相位检测是干涉型光纤电压传感器信号处理单元的主要任务,本文重点对这一单元进行设计。论文首先介绍课题的研究背景,对干涉型光纤传感器的各种相位检测技术进行分析,选择适用于干涉型光纤电压传感器的相位检测技术。论文第二部分对干涉型光纤电压传感器的测压原理进行研究,分析相位检测原理,并确定检测系统的性能指标。以理论分析为基础,论文第三部分设计基于直流相位跟踪大信号检测原理实现的传感器信号处理模拟电路系统,建立系统的数学模型,对该模型进行仿真研究,得出系统的传递函数,分析稳定系统建立的条件和过程。由相应实验系统得到的结果检验系统是否符合预期理论设计要求,进一步证明系统的实时性和可靠性。在实现对信号处理模拟电路单元设计的基础上,论文的第四部分提出了基于FPGA实现的干涉型光纤电压传感器信号处理数字电路系统,分别对大信号检测模拟电路系统的减法器、积分器、带通滤波器和相位跟踪系统用VHDL语言编程和原理图输入相结合的方法进行数字化。其中详细研究采用分布式算法的32阶线性相位FIR带通滤波器的实现方法,此滤波器的主要部分——乘累加单元,采用LUT查找表结构,将乘法运算转换为查表操作,提升处理速度。最后进行系统总体硬件仿真,证明这一方法的可行性。更多还原

【Abstract】 Interferometric fiber-optic sensor has lots of virtues, such as high sensitivity, nice linearity and wide dynamic range. It has become an important category of the fiber-optic sensor, possessing kinds of structures and principle. Thereinto, the interferometric fiber-optic voltage sensor, basing on the principle of white light interference, takes much attention recently. The phase detection is the chief task of the signal processing unit for the interferometric fiber-optic voltage sensor. This paper is devoted to the study on the phase detection principally.Firstly, the background of the research is presented in this paper, and the various techniques of the phase detection are analyzed. Thereinto, the direct current phase tracking method, with the virtue to eliminate the signal fading caused by random phase-shift, is very applicable to phase detection of the interferometric fiber-optic voltage sensor.In the next place, it is researched the voltage-measure theory of the interferometric fiber-optic voltage sensor and the theory of phase detection. And the performance guide lines of the detection system are instituted.Then, the signal processing analog circuit system is designed basing on the theory of the direct current phase tracking large-signal detection. A mathematical former is designed and the simulation with the former is made.The transfer function of the system is educed. It is analyzed the condition and the process how the system turns to stability. It is validated the system to be answered for the prospective theoretic design with the results of the corresponding experiment system. Besides, the real time and credibility of the system is ensured.Basing on the realization of the signal processing analog circuit system for the interferometric fiber-optic voltage sensor, it is put forward the phase detection digital circuit system for the interferometric fiber-optic voltage sensorbasing on FPGA in the third part of this paper. The subtracter, the integrator, the band-pass filter and the phase tracking system are turned to the digital systems with VHDL language programming and schematic diagram input. Thereinto, it is studied the measure of how to realize a 32-tap linear phase FIR band-pass Filter using distributed arithmetic in detail. The chief part of FIR filter is multiplication- accumulation part. It is adopted LUT structure basing on the distributed arithmetic principle, which conveys multiplication to checking table, improving the processing speed. Finally, the hardware simulation is made. The result proves this method to be capable and high effective.更多还原