Indoor carbon dioxide monitoring with diode laser absorption at 2 μm

Jinyi Li; Zhenhui Du; Yiwen Ma; Jingwang Liu

doi:10.1117/12.2181157

4 May 2015 Indoor carbon dioxide monitoring with diode laser absorption at 2 μm

Jinyi Li, Zhenhui Du, Yiwen Ma, Jingwang Liu

Proceedings Volume 9543, Third International Symposium on Laser Interaction with Matter; 954313 (2015) https://doi.org/10.1117/12.2181157
Event: Third International Symposium on Laser Interaction with Matter, 2014, Jiangsu, China

Abstract

In order to investigate the variation of indoor carbon dioxide concentration and how it changes with human activities, a tunable diode laser absorption spectroscopy (TDLAS) system was used to monitor the indoor CO2 concentration. Based on Wavelength Modulation Spectroscopy double frequency detection (WMS-2f), the 2v₁+v₃ characteristic line (4991.26 cm^-1) of CO₂ was measured by a DFB laser. The measured concentration values were calibrated by means of a cell filled with reference gas. The results show that the daily average indoor CO₂ concentrations is about 419ppm which is slightly higher than that of the outdoor and the changing range is between 380ppm and 510ppm in a day. The indoor CO₂ concentration was influenced by the change of ventilation and indoor staff. The respiration of the indoor staff makes a greater impact on a relatively confined indoor CO₂ concentration. The CO₂ increasing rate is measured to be 80ppm/hour in the case of occupant density of 0.06 people/m³. Therefore, the staff crowded indoor should ventilate timely to prevent excessive CO₂ causing people discomfort.

Citation Download Citation

Jinyi Li, Zhenhui Du, Yiwen Ma, and Jingwang Liu "Indoor carbon dioxide monitoring with diode laser absorption at 2 μm", Proc. SPIE 9543, Third International Symposium on Laser Interaction with Matter, 954313 (4 May 2015); https://doi.org/10.1117/12.2181157

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