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:
Journal De Physique Iv, 125, 7-10
Presented at:
13th International Conference on Photoacoustic and Photothermal Phenomena, Rio de Janeiro, Brazil, July 05-08, 2004
Year:
2005
Laboratories:


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 Record created 2008-09-29, last modified 2020-10-25

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