中图分类号：TP212 文献标志码：A DOI: 10.16157/j.issn.0258-7998.256686 中文引用格式： 杨绍松，刘同庆. NDIR二氧化碳气体传感器设计[J]. 电子技术应用，2025，51(12)：120-125. 英文引用格式： Yang Shaosong，Liu Tongqing. Design of NDIR carbon dioxide gas sensor[J]. Application of Electronic Technique，2025，51(12)：120-125.
Design of NDIR carbon dioxide gas sensor
Yang Shaosong，Liu Tongqing
Wuxi XinGanZhi Technology Co.， Ltd.
Abstract： Previous CO2 detection systems were large in size, inconvenient to integrate, generally unreliable, and poor in accuracy, making it difficult to meet the detection requirements in the consumer electronics and automotive fields. This paper designs a high-precision and high-reliability carbon dioxide gas sensor module with temperature compensation function, with infrared light source, gas chamber, dual-channel thermopile detector and single-chip microcomputer as the core. In terms of structure, a reflective gas chamber structure is adopted to improve the integration of the system and realize the miniaturization of the sensor. In terms of hardware design, a variety of anti-interference measures are taken, such as magnetic beads, capacitors, shielding layers, etc., to improve the stability of the sensor module. In terms of software, the ratio calibration method is used to establish a temperature compensation model to eliminate the interference of ambient temperature. The experimental results show that: the sensor has a maximum detection error of less than 3% and a response time of less than two minutes in the concentration range of 0~5 000 ppm at a temperature of -20 ℃~50 ℃. It has the advantages of high precision, fast response, miniaturization, and good long-term stability.
Key words : non-dispersive infrared；gas chamber；temperature compensation；gas sensor
