为了实现对矿井有害气体的有效监测和控制, 本文基于非色散红外( NDIR)原理, 设计了一种双组分气体传感器。重点提出了一种反射式气室, 然后利用光学仿真软件 LightTools对腔体内的光线传播方向进行了光线追迹分析, 并对到达探测器 4个接收面的光强分布进行了模拟分析, 验证了该气室的可行性与优越性。在器件上选用电调制红外光源和热释电探测器, 由单片机处理电信号并输出气体浓度信息, 大大提高了检测精度。实验结果表明, 该传感器能够准确检测 0～2000 ppm范围内的甲烷与二氧化碳气体浓度, 满量程精度可达 4.5%。可以满足矿井内甲烷、二氧化碳气体浓度检测的需要, 具有广阔的应用前景。

To effectively monitor and control harmful gases in mines, the design of a novel, dual gas sensor based on the principle of non-spectroscopic detection technique is presented in this paper. A reflective gas chamber is presented, and subsequently, the optical simulation software LightTools is used to analyze the direction of propagation of light in the cavity and the distribution of light intensity on the four receiving surfaces of the detector for verifying the feasibility and superiority of the gas chamber. The devices used in the sensor include a pulsable IR source and an infrared detector. The single chip of the detector handles the electrical signal and outputs the information about the gas concentrations, thereby greatly improving the detection accuracy of the sensor. The experimental results demonstrate that the proposed sensor can accurately measure the CH4 and CO2 concentrations within a range of 0–2000 ppm, with a full range accuracy of 4.5%. The sensor can therefore effectively detect CH4 and CO2 concentrations in mines and has a broad application prospect.