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
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