Development of an atmospheric CO2 sensor based on TDLAS-WMS

Jingxuan Geng; Lijuan Lan; Qiwu Luo; Chunhua Yang

doi:10.1117/12.2590791

18 March 2021 Development of an atmospheric CO₂ sensor based on TDLAS-WMS

Jingxuan Geng, Lijuan Lan, Qiwu Luo, Chunhua Yang

Proceedings Volume 11780, Global Intelligent Industry Conference 2020; 117801V (2021) https://doi.org/10.1117/12.2590791
Event: Global Intelligent Industry Conference 2020, 2020, Guangzhou, China

Abstract

Greenhouse gases (GHG) have negative impacts on the climate changes. Carbon dioxide (CO₂), one of the dominant GHG, comes mainly from the anthropogenic emissions in urban areas. In this work, we develop a CO₂ sensor based on TDLAS-WMS (tunable diode laser absorption spectroscopy – wavelength modulation spectroscopy) to detect the daily CO₂ concentration in the atmosphere. Firstly, the residual amplitude modulation (RAM) in the first harmonic is eliminated using the phasor decomposition method. Then, the multi-harmonic detection is employed to improve the precision of the sensor. It reveals that the precision can reach 0.02 ppm for CO₂ measurement. The atmospheric CO₂ measurement is conducted in urban area for a whole year. The results indicate that the anthropogenic activities can be observed in the diurnal CO₂ cycles, especially in the wintertime. The developed sensor has a great potential for the air quality monitoring in urban areas.

Citation Download Citation

Jingxuan Geng, Lijuan Lan, Qiwu Luo, and Chunhua Yang "Development of an atmospheric CO₂ sensor based on TDLAS-WMS", Proc. SPIE 11780, Global Intelligent Industry Conference 2020, 117801V (18 March 2021); https://doi.org/10.1117/12.2590791

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