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

Author: Yin Xukun   Dong Lei   Zheng Huadan   Liu Xiaoli   Wu Hongpeng   Yang Yanfang   Ma Weiguang   Zhang Lei   Yin Wangbao   Xiao Liantuan   Jia Suotang  

Publisher: MDPI

E-ISSN: 1424-8220|16|2|162-162

ISSN: 1424-8220

Source: Sensors, Vol.16, Iss.2, 2016-01, pp. : 162-162

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Abstract

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-N2-H2O 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 CH4 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 1.556 × 10 8   W cm 1 / Hz 1 / 2 .