Impact of Humidity on Quartz-Enhanced Photoacoustic Spectroscopy Based CO Detection Using a Near-IR Telecommunication Diode Laser

A near-IR CO trace gas sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) is evaluated using humidified nitrogen samples. Relaxation processes in the CO-N(2)-H(2)O system are investigated. A simple kinetic model is used to predict the sensor performance at different gas pressures. Th...

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Detalles Bibliográficos
Autores principales: Yin, Xukun, Dong, Lei, Zheng, Huadan, Liu, Xiaoli, Wu, Hongpeng, Yang, Yanfang, Ma, Weiguang, Zhang, Lei, Yin, Wangbao, Xiao, Liantuan, Jia, Suotang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4801540/
https://www.ncbi.nlm.nih.gov/pubmed/26828491
http://dx.doi.org/10.3390/s16020162
Descripción
Sumario:A near-IR CO trace gas sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) is evaluated using humidified nitrogen samples. Relaxation processes in the CO-N(2)-H(2)O system are investigated. A simple kinetic model is used to predict the sensor performance at different gas pressures. The results show that CO has a ~3 and ~5 times slower relaxation time constant than CH(4) and HCN, respectively, under dry conditions. However, with the presence of water, its relaxation time constant can be improved by three orders of magnitude. The experimentally determined normalized detection sensitivity for CO in humid gas is [Formula: see text].

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