论文标题
在4.5μm至5μM光谱区域中多种痕量检测的多种痕量痕量检测的开放路径双弯曲光谱
Open-path Dual-comb Spectroscopy for Multispecies Trace Gas Detection in the 4.5 μm to 5 μm Spectral Region
论文作者
论文摘要
开放式双弯曲光谱法提供了高精度的多种大气气体浓度测量。在这里，我们将开放式双梳光谱范围扩展到中型5μm大气窗口，从而实现了主要温室气体的大气浓度检索，n $ _2 $ o，co $ _2 $和H $ _2 $ o _2 $ o，以及Criterion Air Protutant os Criterion Air Protutant o $ $ _3 $和CO跨600 m和2 km和2 km和2 km forts paths。我们在为期两分钟的时间分辨率的五天内证明了测量值，正常运行时间为80％。所达到的精度足以解决多种气体物种的大气浓度变化。检索到CO和N $ _2 $ O的干燥混合率与共同标准的点传感器非常吻合。此外，已检索到的多余Co vs co $ _2 $的比例与类似的城市研究一致，但与美国国家排放库存不同意3倍。我们检索到的多余的N $ _2 $ o vs co $ _2 $的比率表现出羽毛依赖性的价值，表明了温室气体n $ _2 $ _2 $ o _2 $ o的源。
Open-path dual-comb spectroscopy provides multi-species atmospheric gas concentration measurements with high precision. Here, we extend open-path dual comb spectroscopy to the mid-infrared 5 μm atmospheric window, enabling atmospheric concentration retrievals of the primary greenhouse gases, N$_2$O, CO$_2$, and H$_2$O as well as the criterion air pollutants O$_3$ and CO across 600 m and 2 km round-trip paths. We demonstrate measurements over a five-day period at two-minute temporal resolution with 80% uptime. The achieved precision is sufficient to resolve the atmospheric concentration variations of the multiple gas species; retrieved dry mixing ratios of CO and N$_2$O are in good agreement with a co-located point sensor. In addition, the retrieved ratio of excess CO vs CO$_2$ agrees with similar urban studies but disagrees with the US National Emission Inventory by a factor of 3. Our retrieved ratio of excess N$_2$O vs CO$_2$ exhibits a plume-dependent value, indicating the variability of sources of the greenhouse gas N$_2$O.
