4 May 2015 Indoor carbon dioxide monitoring with diode laser absorption at 2 μm
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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.
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Jinyi Li, Jinyi Li, Zhenhui Du, Zhenhui Du, Yiwen Ma, Yiwen Ma, Jingwang Liu, 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); doi: 10.1117/12.2181157; https://doi.org/10.1117/12.2181157
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