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

doi:10.1088/1674-1056/ab5ef6

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.

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

Received: 10 August 2019
Revised: 22 October 2019
Accepted manuscript online:

PACS:	07.88.+y	(Instruments for environmental pollution measurements)
	42.87.-d	(Optical testing techniques)
	42.72.Bj	(Visible and ultraviolet sources)
	33.20.Lg	(Ultraviolet spectra)

Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFC0213304, 2017YFC0209703, and 2016TFC0303900).

Corresponding Authors: Gui-Shi Wang
E-mail: gswang@aiofm.ac.cn

Cite this article:

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 2020 Chin. Phys. B 29 010704

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

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