Articles | Volume 12, issue 5
https://doi.org/10.5194/amt-12-2851-2019
https://doi.org/10.5194/amt-12-2851-2019
Research article
 | 
20 May 2019
Research article |  | 20 May 2019

High-precision measurements of nitrous oxide and methane in air with cavity ring-down spectroscopy at 7.6 µm

Jing Tang, Bincheng Li, and Jing Wang

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Latest update: 19 Jun 2024
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Short summary
A high-sensitivity CH4 and N2O sensor based on mid-IR (7.6 µm) cavity ring-down spectroscopy was developed. The effect of temperature fluctuation on measurement sensitivity was analyzed and corrected, and detection limits of 5 pptv for CH4 and 9 pptv for N2O were experimentally achieved. Separate and continuous measurements of CH4 and N2O concentrations of indoor and outdoor air at different locations showed the spatial and temporal concentration variations of CH4 and N2O in air.