In this study, we present a novel method for measuring unburned methane (CH4) emissions in laboratory flames using mid-infrared hyperspectral imaging. Given the environmental significance of methane’s global warming potential, accurately quantifying emissions from combustion processes is critical. Our approach integrates an extended-area blackbody as the infrared source and a bandpass interference filter to mitigate issues of noise, low signal levels and detector saturation. This setup enabled high-resolution spectral analysis, capturing detailed concentration and temperature maps of methane around the flame. We tracked the dynamics of methane pockets escaping the flame using the hyperspectral imaging system in high-speed camera mode, providing insights into the behavior of unburned gases, such as the velocity of methane pockets. The study demonstrates the feasibility of this technique for assessing combustion efficiency by quantifying the flow of unburned methane through a control surface. Our findings suggest that mid-infrared hyperspectral imaging is a robust tool for remote sensing of methane emissions, offering significant advancements in the accurate measurement and analysis of combustion processes, and providing a benchmarking platform for measurement approaches intended for field applications.

中文翻译：

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使用中红外高光谱成像测量实验室火焰中未燃烧的甲烷排放


在这项研究中，我们提出了一种使用中红外高光谱成像测量实验室火焰中未燃烧甲烷 （CH4） 排放的新方法。鉴于甲烷的全球变暖潜力对环境的影响，准确量化燃烧过程的排放至关重要。我们的方法集成了扩展区域黑体作为红外源和带通干涉滤光片，以缓解噪声、低信号电平和探测器饱和等问题。这种设置实现了高分辨率光谱分析，捕获了火焰周围甲烷的详细浓度和温度图。我们在高速相机模式下使用高光谱成像系统跟踪了从火焰中逸出的甲烷袋的动力学，从而深入了解未燃烧气体的行为，例如甲烷袋的速度。该研究证明了这种技术通过量化未燃烧的甲烷流经控制表面来评估燃烧效率的可行性。我们的研究结果表明，中红外高光谱成像是甲烷排放遥感的强大工具，在燃烧过程的准确测量和分析方面取得了重大进展，并为现场应用的测量方法提供了基准平台。