Design of a cooled broadband infrared gas detection system and experiment on micro-leakage monitoring

To address the demand for micro-leakage detection of industrial gases, this paper proposes a gas monitoring system based on cooled broadband infrared detection technology. Through laboratory experiments and field tests in a petrochemical storage tank area, the system’s capability for visual detection of gases including methane (CH₄), carbon monoxide (CO), ethylene (C₂H₄), and butane (C₄H₁₀) was verified, and the spectral response band selection for the detector was optimized. Experimental results demonstrate that the target gases exhibit significant characteristic absorption peaks within the midwave infrared (MWIR, 3–5 𝜇𝑚 ) band. The detector captures leaking gas in real-time and enables semi-quantitative analysis, achieving a detection sensitivity of 0.1 ppm.