1 College of Integrated Circuits, Taiyuan University of Technology, Jinzhong 030600, China
2 Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Jinzhong 030600, China
3 Shanxi Coking Coal Huozhou Coal and Electricity Pangpangta Mine, Lüliang 033000, China
To meet the requirements of high precision, integration, and anti-interference for hazardous gas monitoring in underground coal mines, the structure of a tri-ellipsoidal multi-component gas infrared detection chamber was optimized, and an integrated CH4-CO2-CO gas sensor was designed. First, based on NDIR (non-dispersive infrared) measurement principle, a tri-ellipsoidal photoelectric sensing gas chamber was designed, and the optimal chamber height was obtained by introducing a reference angle combined with simulation. Second, to address the issues of signal susceptibility to interference and weak signal strength during sensor information transmission, a characteristic signal extraction and filtering-amplification circuit was designed. By integrating the excitation and signal conditioning of sensitive elements, a modular sensor hardware system was constructed to improve signal detection accuracy and antiinterference capability. Finally, a gas sensor testing and calibration platform was established to conduct experimental validation.The experimental results demonstrate that at room temperature of 25 ℃, the designed sensor can simultaneously detect CH4, CO2, and CO gases in the range of 0~0.40%, with a signal-to-noise ratio on the order of 108, a relative standard deviation of about 0.5%, and a system response time of approximately 12 s, exhibiting excellent stability and output quality.
GONG Xia-xia, QIAO Tie-zhu, DONG Hui-jie, WANG Zhi-gang.
Tri-ellipsoidal Multi-component Gas Infrared Detection Sensor for Coal Mines[J].
Science Technology and Engineering, 2026, 26(26): 11359-11366 DOI:10.12404/j.issn.1671-1815.2507376
在稳定性实验中,对环境的温度、湿度等条件进行控制,确保传感器稳定性实验的外界条件相同。实验环境为室温传感器工作稳定之后,0.05%气体浓度每隔5 s记录一次数据,连续记录10次数据并求其平均值,重复实验,得到检测同一浓度3种气体的5个平均检测值。实验结果如表2所示,使用相对标准偏差(relative standard deviation, RSD)来评价传感器测量系统的稳定性。RSD计算公式为
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