Application of Fiber Bragg Grating for Determining Positions of Gas Absorption Lines  

作　　者：韩文念 汪曣 马凤 刘琨 贾大功 刘铁根 张红霞 

机构地区：[1]School of Precision Instrument and Opto-Electronics Engineering,Tianjin University

出　　处：《Transactions of Tianjin University》2010年第5期373-375,共3页天津大学学报（英文版）

基　　金：Supported by Major State Basic Research Program of China("973"Program,No.2010CB327800);Research Fund for Doctoral Program of Higher Education of China(No.20090032110053);New Teacher Research Fund for Doctoral Program of Higher Education of China (No.200800561022)

摘　　要：Fiber Bragg grating(FBG) is used as a wavelength reference device to calibrate the position of gas absorption peak in the intracavity absorption gas sensor(ICAGS) based on erbium-doped fiberring laser.This system can detect both the reflectance spectrum of FBGs and absorption spectrum of measured gas during a single wavelength sweeping process by linearly varying the driving voltage of optic filter.The voltages corresponding to center wavelength positions of four FBGs in the spectrum are determined through ...Fiber Bragg grating(FBG) is used as a wavelength reference device to calibrate the position of gas absorption peak in the intracavity absorption gas sensor(ICAGS) based on erbium-doped fiberring laser.This system can detect both the reflectance spectrum of FBGs and absorption spectrum of measured gas during a single wavelength sweeping process by linearly varying the driving voltage of optic filter.The voltages corresponding to center wavelength positions of four FBGs in the spectrum are determined through Gaussian peak fitting.Then,the wavelengths of gas absorption lines are deduced from the correspondence between driving voltage and wavelength obtained by quadratic curve fitting.The maximum error of wavelength of acetylene absorption lines between experimental results and those from HITRAN database is 0.106 nm and the resolving accuracy of two adjacent absorption lines is about 93.593%.By using this method,ICAGS can theoretically recognize the measured gas type and monitor multi-gas components.

关 键 词：fiber Bragg grating gas absorption erbium-doped fiber Gaussian fitting 

分 类 号：O436.1[机械工程—光学工程]