QEPAS methane sensor performance for humidified gases

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 2ν 3 state of CH 4 were investigated. Sensor performance at different gas pressures could be predic...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2008-07, Vol.92 (1), p.103-109
Main Authors: Kosterev, A.A., Bakhirkin, Y.A., Tittel, F.K., McWhorter, S., Ashcraft, B.
Format: Article
Language:English
Subjects:
Engineering
Exact sciences and technology
Gas pressure
Gas sensors
General equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Lasers
Mathematical models
Methane
Optical Devices
Optics
Photoacoustic spectroscopy
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
Quartz
Sensors
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
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Summary: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 2ν 3 state of CH 4 were investigated. Sensor performance at different gas pressures could be predicted based on a developed kinetic model. The experimentally determined normalized detection sensitivity for CH 4 in humid gas is 1.0×10 -8  cm -1  W/Hz 1/2 .
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-008-3056-9