Industrial hazardous gas leakage detection using infrared imaging technology has become an important area of research and application. However, existing single-band imaging methods face limitations in power consumption and cost. This paper proposes a novel design based on a micro-lens zonal filter array. This system can perform multi-spectral infrared imaging of gas clouds from various typical industrial gas leaks using an uncooled infrared detector. The key innovation is the use of a partitioned filter array to split the incident infrared radiation into different spectral bands and focus them onto distinct regions of the focal plane detector. By simultaneously imaging multiple infrared bands from 3 to 14 μm, the system can effectively detect and differentiate between various gas species in the gas cloud. Preliminary results demonstrate that this approach can improve the detection efficiency of hazardous gas leakage and enable the miniaturization and integration of the infrared imaging system.
Aiming at the requirements of gas detection in petroleum, petrochemical, power equipment and air pollution monitoring, some key technologies in passive uncooled gas leakage infrared imaging detection system are analyzed. Based on the gas absorption line intensity and absorption peak position in the standard infrared database, the key components such as MW and LW infrared optical lens and wide band uncooled infrared focal plane detector are optimized. Considering the imaging signal-to-noise ratio and signal contrast, the filter used in several typical gas detections is analyzed, and an online and handheld gas leakage infrared imaging detection system capable of detecting multiple gases is designed. Theoretically, it is possible to detect gas with characteristic absorption in the range of 3-14 μm. The imaging effects of carbon dioxide gas, methane gas and sulfur hexafluoride gas with absorption peaks in MW and LW bands were measured. The test results show that the uncooled infrared gas detection system designed in this paper not only has good imaging detection ability for sulfur hexafluoride gas and ethylene gas (near 10.5 μm) with large absorption intensity and absorption peak in conventional LW band, but also for methane gas (near 7.5μm or 3.3μm) and carbon dioxide gas (near 4.2 μm) with absorption peak in unconventional LW band. In the laboratory environment, with the black body as the background, the gas flow rate is controlled by the gas mass flow meter to observe the imaging detection effects under different temperature differences and different flow rates. When the target and background temperature difference is 5K, the gas detection ability is ≤100mL/min.
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