大气与环境光学学报2025，Vol.20Issue(4)：461-469,9.DOI:10.3969/j.issn.1673-6141.2025.04.004
基于7.6 μm量子级联激光探测氧化亚氮
Detection of nitrous oxide based on 7.6 μm quantum cascade laser
摘要
Abstract
The greenhouse effect has a great impact on the earth's environment and climate,so accurate detection of greenhouse gases is of great significance.As one of the important greenhouse gases,nitrous oxide(N2O)has a much higher greenhouse effect potential than carbon dioxide(CO2).However,compared to the widely studied CO2 and methane(CH4),there is less research on N2O.In this paper,a system based on a domestically developed 7.6 μm mid infrared quantum cascade laser was established for atmospheric N2O detection.The system adopts wavelength modulation and the second harmonic detection technology,with the N2O absorption line at 1307.66 cm-1 as the target line.Firstly,the optimal modulation amplitude of the system was determined by detecting the second harmonic signal of a certain concentration of N2O at different modulation amplitudes.Then under the optimal experimental conditions,N2O gas with different concentrations was measured,and the signal-volume fraction calibration curve of the system was obtained.The results showed that the minimum detection limit of N2O volume fraction of the system was 1.34×10-9,indicating that the system can meet the needs of atmospheric N2O measurement.A 6-hour detection of N2O was further carried out,and the averaged volume fraction of N2O during detection was 325×10-9,which is equivalent to the well-known volume fraction of atmospheric N2O of 320×10-9.关键词
量子级联激光器/氧化亚氮/波长调制吸收光谱/痕量气体探测Key words
quantum cascade laser/nitrous oxide/wavelength modulation absorption spectroscopy/trace gas detection分类
数理科学引用本文复制引用
周彧,王莉,查申龙..基于7.6 μm量子级联激光探测氧化亚氮[J].大气与环境光学学报,2025,20(4):461-469,9.基金项目
国家自然科学基金(62205005),安徽省教育厅自然科学研究重点项目(KJ2020A0752,2022AH051923),蚌埠学院自然科学研究一般项目(2022ZR01) （62205005）
