介绍了一种基于非分散红外（NDIR）原理的煤矿甲烷检测仪的总体设计。该检测仪使用进口红外检测元件，以新型电调制光源代替机械调制光源，实现了对煤矿井下大范围甲烷浓度的实时测量、液晶显示和超限声光报警等功能，并把甲烷浓度值转化为与煤矿其他设备兼容的４～２０ mA标准模拟电信号，*后给出该检测仪在甲烷体积分数为０～１０％的测量结果。 Coal Mine Methane Detector Based on NDIR Principle LIU Min１，TANG Zhen-an１，ZHANG Hong-quan２ （１．Dept．of Electronic，Dalian University of Technology，Dalian １６０２３，China；２．NO．４９ Research Institution of CECT，Herbin １５０００１，China） Abstract：Introduces the general design of coal mine methane detetor which is based on Non-Dispersive Infrared （NDIR） principle．Using an imported infared element，with the news-style electric modulation light source instead of conventional mechanical modulation light source，the detector actualized real-time measurement，LCD display and limit-alarm with lignt and sound for large range methane below the coal mine，also，the detector converts the information of gas concentration to ４~２０mA normal analog signal which is compatible with other equipment in the coal mine．Finally，the paper presents measurement results of methane concentration at ０~１０％． Key Words：NDIR；electronic modulation；methane detector