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
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.
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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