Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 92, Issue 1, Pages 103-109Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-008-3056-9
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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 2 nu(3) 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 1.0x10(8) cm(-1) W/Hz(1/2).
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