光纤光栅传感系统的信号解调

首先介绍了光纤光栅的基本知识,再分别介绍了几种典型解调方法的工作原理、性能和特点,给出了其工作原理图,并对各种解调方法的优缺点进行了论述。提出了一种基于CCD的光纤光栅传感解调系统,该系统采用反射式成像系统,用CCD作为探测器,并利用可编程逻辑器件FPGA设计驱动电路和信号处理电路,实现了一种体积小、结构简单,解调速度快,可以实时测量的波长解调系统,为光纤光栅解调技术的实际应用和光纤光栅传感解调系统的设计提供了理论依据。

Demodulation Methods of FBG Sensing System

The basic knowledge of the fiber Bragg grating (FBG) is introduced, then the working principle, performance and characteristics of several typical demodulation methods are introduced respectively. The diagrams of working principle are given，the advantages and disadvantages of various demodulation methods are discussed. A charge-coupled device (CCD)-based FBG sensing demodulation system is proposed，it uses the reflective imaging system，uses CCD as a detector, and uses the field programmable gate array FPGA to design the drive circuit and signal processing circuit．A wavelength demodulation system which has small size，simple structure, fast demodulation speed, and real-time monitoring capability is realized．These provides the theoretical basis for the practical applications of FBG demodulation techniques and the design of FBG demodulation system.