Methane monitoring by near infrared photoacoustic spectroscopy: the importance of relaxation phenomena

The importance of molecular relaxation in photoacoustic spectroscopy is discussed. The particular case of methane monitoring in dry oxygen using a 1.65-μm laser-based photoacoustic sensor is reported. The slow vibration-to-translation energy transfer occurring in this gas mixture results in a drastic reduction of the detection sensitivity. A quadratic response of the sensor to the methane concentration is also reported and explained by molecular relaxation effects


Published in:
13th International Conference on Photoacoustic and Photothermal Phenomena, 125, Copyright 2006, IEE, 7-10
Presented at:
Rio de Janeiro, Brazil
Year:
2005
Publisher:
EDP Sciences
Keywords:
Note:
Nanophotonics & Metrol. Lab., Swiss Fed. Inst. of Technol., Laussane, Switzerland 8818748 methane concentration monitoring near infrared photoacoustic spectroscopy molecular relaxation effects dry oxygen laser-based photoacoustic sensor vibration-to-translation energy transfer gas mixture detection sensitivity 1.65 micron O2
Laboratories:




 Record created 2008-09-29, last modified 2018-09-13


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