以MSP430F149单片机为核心,研制了1台应用于燃气泄漏检测的CO-CH4气体变送器,实现对应CO气体0~200×10^-6、CH4气体0~5 000×10^-6的0~3 V线性电压输出,分辨率分别为20×10-6和500×10-6.详细叙述了气体传感器的采样时序产生电路,放大电路以及线性化模拟电压的输出方法。 CO-CH4 Gas Transducer Used for Coal Gas Detection QIAN Sheng-bin1,TANG Zhen-an1,ZHANG Hong-quan2 (1.Dalian University of Technology, Dalian 116023,China;2.No.49 Reserch Institution of CECT,Harbin 150001,China) Abstract: Present a CO-CH4 gas transducer used for coal gas detection,which transform the gas consistency input (CO form 0×10^-6 to 200×10^-6, CH4 from 0×10^-6 to 5000×10^-6)to a 0~3V linear voltage output with a given resolution (CO 20×10^-6, CH4 500×10^-6). The generating circuit of the sampling time sequences, the amplifying circuit and the linearization method of the anolog voltage for the gas sensors are described in detail. Key words: coal gas detection;gas transduce;linear output