基于7.6 μm量子级联激光探测氧化亚氮（封面文章）

doi:10.3969/j.issn.1673-6141.2025.04.004

大气与环境光学学报 ›› 2025, Vol. 20 ›› Issue (4): 461-469.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（封面文章）

周彧 1, 王莉 1, 查申龙 2*

1 蚌埠学院数理学院, 安徽蚌埠 233030; 2 安庆师范大学电子工程与智能制造学院, 安徽安庆 246133

收稿日期:2024-03-15 修回日期:2024-07-10 出版日期:2025-07-28 发布日期:2025-07-25
通讯作者: E-mail: zslwinner@163.com E-mail:zslwinner@163.com
作者简介:周彧 (1986- ), 安徽合肥人, 博士, 讲师, 主要从事高灵敏度激光光谱技术应用方面的研究。E-mail: bbxyzhyu@126.com
基金资助:
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)

Detection of nitrous oxide based on 7.6 μm quantum cascade laser

ZHOU Yu 1, WANG Li 1, ZHA Shenlong 2*

1 School of Mathematics and Physics, Bengbu University, Bengbu 233030, China; 2 School of Electronic Engineering and Intelligent Manufacturing, Anqing Normal University, Anqing 246133, China

Received:2024-03-15 Revised:2024-07-10 Online:2025-07-28 Published:2025-07-25

摘要/Abstract

摘要： 温室效应对地球环境气候有着巨大的影响，因此对温室气体的准确探测有着重要的意义。作为重要的温室气体之一，氧化亚氮 (N2O) 的温室效应潜能远高于二氧化碳 (CO2)。然而，相比较于被广泛研究的CO2和甲烷 (CH4)，关于N2O的相关研究却相对匮乏。本文基于国内自主研发的7.6 μm中红外量子级联激光建立了一套N2O探测实验系统并开展了N2O的探测研究。该系统采用波长调制吸收光谱技术，以1307.66 cm-1处的N2O吸收谱线作为探测对象。首先通过对一定浓度N2O气体在不同调制振幅下的信号探测，确定系统的最佳调制振幅；然后在最优实验条件下对不同浓度的N2O气体进行测量，获得系统的信号-N2O浓度定标曲线。实验结果表明系统的N2O体积分数的最小探测极限为1.34 × 10-9，满足大气N2O气体的测量需要。利用此探测系统对空气中N2O气体进行6 h 连续探测，获得6 h 内 N2O气体的平均体积分数为325 × 10-9，与大气N2O体积分数320 × 10-9相当。

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

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.

Key words: quantum cascade laser, nitrous oxide, wavelength modulation absorption spectroscopy, trace gas detection

中图分类号:

O433.1

周彧, 王莉, 查申龙 . 基于7.6 μm量子级联激光探测氧化亚氮（封面文章）[J]. 大气与环境光学学报, 2025, 20(4): 461-469.

ZHOU Yu , WANG Li , ZHA Shenlong . Detection of nitrous oxide based on 7.6 μm quantum cascade laser[J]. Journal of Atmospheric and Environmental Optics, 2025, 20(4): 461-469.

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基于7.6 μm量子级联激光探测氧化亚氮（封面文章）

Detection of nitrous oxide based on 7.6 μm quantum cascade laser

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