调谐式激光甲烷检测装置  

Harmonic Laser Methane Detection Device

作　　者：刘彬[1] 童敏明[1] 郝继飞[1] 王晶晶[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221008

出　　处：《煤炭技术》2010年第5期42-45,共4页Coal Technology

基　　金：国家863计划资助项目(2007AA04Z332)

摘　　要：设计了基于调谐式激光吸收光谱技术的甲烷检测装置,采用DFB作为光源,通过对光源的调制实现甲烷气体浓度的谐波检测。该装置利用一次谐波作为反馈信号对光源输出波长进行稳频,利用二次谐波和一次谐波的比值作为系统的输出,消除了光源光强波动等共模噪声的影响。设计的调谐式激光甲烷检测装置通过了实验检验,在0～5%范围内的检测相对误差小于2%,满足煤矿安全监测的要求。This article designed a methane detection device based on the tunable laser absorption spectroscopy technique,using DFB as the light source,through the modulation of the light source achieve harmonic detection of methane gas concentrations.The device uses the first harmonic as a feedback signal to stable the output wavelength of the light source,and uses the ratio of the second harmonic and first harmonic as the system＇s output,eliminating common-mode noise such as the intensity fluctuations of the light source.The design of tunable laser methane detection device successed in test by the experiment,and the testing relative error within the gas scope of 0～5% is less than 2%,able to meet the coal mine safety monitoring requirements.

关 键 词：甲烷 瓦斯监测 谐波检测 DFB激光器 

分 类 号：TD712[矿业工程—矿井通风与安全]