Publication

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

Luc Thévenaz, Stéphane Schilt, Jean-Philippe Besson
2005
Conference Papers

Abstract

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

Official source

https://infoscience.epfl.ch/entities/publication/37eeb28c-d437-4b19-81e6-8d345a79ec60

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

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