本文论述了井下有害气体（甲烷）浓度光纤传感在线检测系统。同时对矿井瓦斯爆炸的灾害特点进行了叙述,分析我国现有矿井检测装置特点及不足之处,并对该装置的基本原理进行了详细的论述。系统传感头利用CH4μm处的谐波吸收谱工作。系统采用双波长差分吸收的工作方式,消除了非光吸收的其他散射和微扰等影响。用于检测瓦斯气体浓度的光纤瓦斯气体传感器在采矿、化工、石油等工业中,尤其在恶劣和危险的环境中,具有广阔的应用前景。系统中的下位机采用AT89S52对井下有害气体进行多点巡回检测、数据采集处理、气体浓度信息管理。最后对实验结果进行了讨论。关键词：井下气体光纤传感器单片机在线检测TITLE:MineGasSCMFiberSensorControlSystemAbstractThepaperdiscussesakindofpoisongas(CH4)opticfibersensorsystemwhichdetectsthepoisongasconcentrationinlongdistance.Thepaperfirstintroducesthefeaturesofminedisaster,especiallythefiredampexplosion,itanalysesthecharacteristicsinChinaandbringsforwardstheapplicationaswellastheprincipleofmine-visualizingrescueinstrumentindetail.wavelength-divisionmultiplexertechnology.ByuseoftheCH4,thesensorofthesystemworksintheharmonicabsorptionspectrumat1.331μm.Opticfibermethanegassensorswhichareusedtomeasuretheconcentrationofmethanehaveawideapplicationprospectinmining,chemical,oilandmanyotherindustries,especiallyinhazardousandhostileenvironments.TheguestcomputerAT89S52isintroducedfordataprocessing,multipointdetectingtour.IPCisresponsibleforpoisongasconcentrationinformationmanagement.Atlast,itdiscussestheexperimentalresults,putsforwardaplanhowtoimprovethedetectionsensitivityofthesystem.Keywords:CH4OpticfibersensorSCMcontrolsystemOn-linemeasurement目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc200989593"第一章绪论PAGEREF_Toc200989593\h1HYPERLINK\l"_Toc200989594"1.1引言PAGEREF_Toc200989594\h1HYPERLINK\l"_Toc200989595"1.2瓦斯爆炸原因分析PAGEREF_Toc200989595\h1HYPERLINK\l"_Toc200989596"1.3瓦斯事故的预测PAGEREF_Toc200989596\h2HYPERLINK\l"_Toc200989597"1.4光纤传感器PAGEREF_Toc200989597\h3HYPERLINK\l"_Toc200989598"1.5光纤瓦斯传感器PAGEREF_Toc200989598\h5HYPERLINK\l"_Toc200989599"1.6光纤瓦斯传感器发展方向PAGEREF_Toc200989599\h8HYPERLINK\l"_Toc200989600"1.7设计的主要工作PAGEREF_Toc200989600\h9HYPERLINK\l"_Toc200989601"第二章系统整体设计PAGEREF_Toc200989601\h10HYPERLINK\l"_Toc200989602"系统设计原理PAGEREF_Toc200989602\h10HYPERLINK\l"_Toc200989603"2.2传感元件PAGEREF_Toc20