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This paper presents the construction of a mid-infrared trace gas detection system based on a BaGa4Se7 optical parametric oscillator for the precise detection of CO2 gas. By optimizing beam shaping and photodetector selection, the system’s sensitivity was enhanced by 6.5 orders of magnitude. Utilizing the Beer-Lambert law and the HITRAN 2012 database, a systematic analysis was conducted to study the effect of gas pressure on absorbance. The results revealed a significant linear increase in absorbance with rising gas pressure, validating the accuracy of the theoretical model. Furthermore, the impact of increasing temperature on gas pressure and absorbance in confined spaces was investigated, demonstrating considerable application potential. In free-space environments, the influence of gas flow rate and detection distance on the signal was also examined. Experimental results showed that the signal voltage amplitude increased linearly with gas flow rate, while the signal attenuated nonlinearly as detection distance increased. The experiments confirmed the potential of this mid-infrared system for non-contact spirometry, achieving an inversion error of less than 2.8%. This study provides a theoretical foundation and practical support for optimizing optical gas detection systems and expanding their applications in the biomedical field.

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Research on the Detection of Trace CO2 Gas Based on a 3–8 μm Mid-infrared System

  • 会议论文

  • 发表日期：

    2025年

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  • Haibo Wang,
  • Li Wang,
  • Feng Qi,
  • Qin Dai

摘要

This paper presents the construction of a mid-infrared trace gas detection system based on a BaGa4Se7 optical parametric oscillator for the precise detection of CO2 gas. By optimizing beam shaping and photodetector selection, the system’s sensitivity was enhanced by 6.5 orders of magnitude. Utilizing the Beer-Lambert law and the HITRAN 2012 database, a systematic analysis was conducted to study the effect of gas pressure on absorbance. The results revealed a significant linear increase in absorbance with rising gas pressure, validating the accuracy of the theoretical model. Furthermore, the impact of increasing temperature on gas pressure and absorbance in confined spaces was investigated, demonstrating considerable application potential. In free-space environments, the influence of gas flow rate and detection distance on the signal was also examined. Experimental results showed that the signal voltage amplitude increased linearly with gas flow rate, while the signal attenuated nonlinearly as detection distance increased. The experiments confirmed the potential of this mid-infrared system for non-contact spirometry, achieving an inversion error of less than 2.8%. This study provides a theoretical foundation and practical support for optimizing optical gas detection systems and expanding their applications in the biomedical field.