Abstract
A trace gas sensor based on quartz enhanced photoacoustic spectroscopy (QEPAS) was evaluated using humidified nitrogen samples and ambient air. Relaxation processes following vibrational excitation of 2ν3 state of CH4 were investigated. Sensor performance at different gas pressures could be predicted based on a developed kinetic model. The experimentally determined normalized detection sensitivity for CH4 in humid gas is 1.0×10-8 cm-1 W/Hz1/2.
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