The largest share of greenhouse gas (GHG) emissions related to livestock originates from methane (CH) and nitrous oxide (NO) which have a far higher influence on global warming, it is therefore necessary to accurately monitor CH and NO emissions to provide theoretical and practical basis for further estimating and regulating GHG emissions from livestock and improving livestock production performance. For the purpose of sensing CH and NO emissions during livestock living process in real time, an optical sensor based on continuous-wave (CW) external cavity quantum cascade laser (EC-QCL) operating at room temperature was developed. CH and NO absorption lines, located around 8 μm, of the ν and ν fundamental vibrational bands, respectively, were chosen for direct absorption spectroscopy, which allows for sensitive, selective and simultaneous measurement of CH and NO concentrations. Use of a Herriot multi-pass cell with an effective path-length of 100 m, 1σ (SNR = 1) limits of detection of 26.8 ppbv, 20.3 ppbv and 0.01 % for CH, NO and HO vapor were achieved, respectively. Field measurement of CH and NO emissions from horses has been carried out in a stable over two weeks at the Vernaelde farm in Couderkerque Branche city, France. Concentrations of CH and NO up to 10 times and 1.5 times higher than their levels in the local ambient air (∼ 2.12 ppmv and ∼ 427 ppbv) were observed, respectively.

中文翻译：

---

利用中红外外腔量子级联激光吸收光谱实时监测牲畜的CH4和N2O排放


与畜牧业相关的温室气体（GHG）排放中最大部分来自甲烷（CH）和一氧化二氮（NO），它们对全球变暖的影响要大得多，因此有必要准确监测CH和N2O排放，为全球变暖提供理论和依据。为进一步估算和监管畜牧业温室气体排放以及改善畜牧业生产绩效提供实用依据。为了实时感知牲畜生活过程中CH和NO的排放，开发了一种基于室温连续波（CW）外腔量子级联激光器（EC-QCL）的光学传感器。 CH 和 NO 吸收线分别位于 ν 和 ν 基本振动带的 8 μm 左右，被选择用于直接吸收光谱，从而可以灵敏、选择性地同时测量 CH 和 NO 浓度。使用有效光程为 100 m 的 Herriot 多次通过池，CH、NO 和 H2O 蒸气的检测限分别为 26.8 ppbv、20.3 ppbv 和 0.01 %，为 1σ (SNR = 1)。法国 Couderkerque Branche 市 Vernaelde 农场的马厩中对马匹的 CH 和 NO 排放量进行了两周多的现场测量。观察到 CH 和 NO 的浓度分别比当地环境空气中的浓度高出 10 倍和 1.5 倍（~ 2.12 ppmv 和~ 427 ppbv）。