利用甲烷气体分子在3.3 μm处的主吸收峰，研制了一种基于非色散红外光谱技术的红外甲烷传感器.传感器的光学部分由峰值波长为3.4 μm的测量发光二极管、峰值波长为2.7 μm的参考发光二极管、截止波长为3.6 μm的光电二极管及球面反射面组成；电路部分包括发光二极管驱动电路、光敏信号处理电路、温度测量电路、微处理器.采用短脉冲供电控制逻辑的工作模式，降低红外光源的上电时间，将光学测量器件的功耗降至16 mW.实验研究了温度变化对传感器甲烷浓度测量结果的影响，通过数据分析及线性拟合，得出了温度补偿算法公式.补偿后的传感器及检测系统平台实验结果表明：传感器平均功耗为23.56 mW，在-20~50℃的温度范围内温度变化对测量值的影响不超过真值的3%，湿度影响不超过真值的4%，响应时间小于25 s，工作稳定性时间大于60天，性能指标均满足或优于AQ6211-2008煤矿用非色散红外甲烷传感器行业标准相关要求.与热辐射红外光源或激光检测原理的甲烷传感器相比，基于双窄带发光二极管的红外甲烷传感器功耗降低70%以上，能够满足便携式、无线化应用场合低功耗的技术要求.

Using the main absorption peak of methane molecule at the wavelength of 3.3 μm, an infrared methane sensor based on non-dispersed infrared spectroscopy was developed. The optical part of the sensor consists of a measuring LED with a peak wavelength of 3.3 μm, a reference LED with a peak wavelength of 2.7 μm, a photodiode with a cutoff wavelength of 3.6 μm and a spherical emitting surface. The circuit part mainly includes LED driving circuit, photosensitive signal processing circuit, temperature measuring circuit and microprocessor. The short pulse power supply control logic mode is adopted to reduce the power on time of the infrared light source, and the power consumption of the optical measuring device is reduced to 16 mW. The influence of temperature change on the measurement results of methane was studied experimentally, through data analysis and linear fitting, the temperature compensation algorithm formula was obtained. The experimental results of the sensor with compensation and detection system platform show that the average power consumption of the sensor is 23.56 mW, the influence of temperature change in the temperature range of -20~50℃ on the measured value is not more than 3% of the true value, humidity influence detection value is less than 4%, the response time is less than 25 s, the working stability time is more than 60 days, and the performance indexes meet or are better than the relevant requirements of AQ6211-2008 coal mine non-dispersive infrared methane transducer. Compared with the methane sensor based on the principle of thermal radiation infrared light source or laser detection, the power consumption of the infrared methane sensor based on double narrow-band LED is reduced by more than 70%, which can meet the technical requirements of low power consumption in portable and wireless applications.