Atmospheric N2O gas detection based on an inter-band cascade laser around 3.939 μm

doi:10.1088/1674-1056/ab5ef6

中国物理B ›› 2020, Vol. 29 ›› Issue (1): 10704-010704.doi: 10.1088/1674-1056/ab5ef6

Atmospheric N₂O gas detection based on an inter-band cascade laser around 3.939 μm

Chun-Yan Sun(孙春艳), Yuan Cao(曹渊), Jia-Jin Chen(陈家金), Jing-Jing Wang(王静静), Gang Cheng(程刚), Gui-Shi Wang(王贵师), Xiao-Ming Gao(高晓明)

1 Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
2 University of Science and Technology of China, Hefei 230031, China;
3 Huainan Normal University, Huainan 232001, China

收稿日期:2019-08-10 修回日期:2019-10-22 出版日期:2020-01-05 发布日期:2020-01-05
通讯作者: Gui-Shi Wang E-mail:gswang@aiofm.ac.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFC0213304, 2017YFC0209703, and 2016TFC0303900).

Atmospheric N₂O gas detection based on an inter-band cascade laser around 3.939 μm

Chun-Yan Sun(孙春艳)^1,2,3, Yuan Cao(曹渊)^1,2, Jia-Jin Chen(陈家金)¹, Jing-Jing Wang(王静静)^1,2, Gang Cheng(程刚)^1,2, Gui-Shi Wang(王贵师)¹, Xiao-Ming Gao(高晓明)¹

1 Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
2 University of Science and Technology of China, Hefei 230031, China;
3 Huainan Normal University, Huainan 232001, China

Received:2019-08-10 Revised:2019-10-22 Online:2020-01-05 Published:2020-01-05
Contact: Gui-Shi Wang E-mail:gswang@aiofm.ac.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFC0213304, 2017YFC0209703, and 2016TFC0303900).

摘要/Abstract

摘要： N₂O is a significant atmospheric greenhouse gas that contributes to global warming and climate change. In this work, the high sensitivity detection of atmospheric N₂O is achieved using wavelength modulation spectroscopy (WMS) with an inter-band cascade laser operating around 3.939 μm. A LabVIEW-based software signal generator and software lock-in amplifiers are designed to simplify the system. In order to eliminate the interference from water vapor, the detection was performed at a pressure of 0.1 atm (1 atm=1.01325×10⁵ Pa) and a drying tube was added to the system. To improve the system performance for long term detection, a novel frequency locking method and 2f/1f calibration-free method were employed to lock the laser frequency and calibrate the power fluctuations, respectively. The Allan deviation analysis of the results indicates a detection limit of ~20 ppb (1 ppb=1.81205 μg/m³) for a 1 s integration time, and the optimal detection limit is ~5 ppb for a 40-s integration time.

关键词: wavelength modulation spectroscopy, inter-band cascade laser, frequency locking, nitrous oxide (N₂O)

Abstract: N₂O is a significant atmospheric greenhouse gas that contributes to global warming and climate change. In this work, the high sensitivity detection of atmospheric N₂O is achieved using wavelength modulation spectroscopy (WMS) with an inter-band cascade laser operating around 3.939 μm. A LabVIEW-based software signal generator and software lock-in amplifiers are designed to simplify the system. In order to eliminate the interference from water vapor, the detection was performed at a pressure of 0.1 atm (1 atm=1.01325×10⁵ Pa) and a drying tube was added to the system. To improve the system performance for long term detection, a novel frequency locking method and 2f/1f calibration-free method were employed to lock the laser frequency and calibrate the power fluctuations, respectively. The Allan deviation analysis of the results indicates a detection limit of ~20 ppb (1 ppb=1.81205 μg/m³) for a 1 s integration time, and the optimal detection limit is ~5 ppb for a 40-s integration time.

Key words: wavelength modulation spectroscopy, inter-band cascade laser, frequency locking, nitrous oxide (N₂O)

中图分类号: (Instruments for environmental pollution measurements)

07.88.+y

42.87.-d (Optical testing techniques) 42.72.Bj (Visible and ultraviolet sources) 33.20.Lg (Ultraviolet spectra)

孙春艳, 曹渊, 陈家金, 王静静, 程刚, 王贵师, 高晓明. Atmospheric N₂O gas detection based on an inter-band cascade laser around 3.939 μm[J]. 中国物理B, 2020, 29(1): 10704-010704.

Chun-Yan Sun(孙春艳), Yuan Cao(曹渊), Jia-Jin Chen(陈家金), Jing-Jing Wang(王静静), Gang Cheng(程刚), Gui-Shi Wang(王贵师), Xiao-Ming Gao(高晓明). Atmospheric N₂O gas detection based on an inter-band cascade laser around 3.939 μm[J]. Chin. Phys. B, 2020, 29(1): 10704-010704.

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Atmospheric N₂O gas detection based on an inter-band cascade laser around 3.939 μm

Atmospheric N₂O gas detection based on an inter-band cascade laser around 3.939 μm

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