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Detection of molecular oxygen at low concentrations using quartz enhanced photoacoustic spectroscopy

 
: Pohlkötter, A.; Köhring, M.; Willer, U.; Schade, W.

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Volltext (PDF; )

Sensors. Online journal 10 (2010), Nr.9, S.8466-8477
http://www.mdpi.com/journal/sensors
ISSN: 1424-8220
Englisch
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer HHI ()

Abstract
Molecular oxygen is detected at low concentrations using photoacoustic spectroscopy despite its unfavorable photoacoustic properties. The system consists of a seed laser diode, a tapered amplifier and a quartz tuning fork based spectrophone, thus employing quartz enhanced photoacoustic spectroscopy (QEPAS). With this system a detection limit of 13 ppm is reached with a compact and long term stable setup. Further improvement of the detection limit is possible by adding suitable gases to the sample gas that promote the radiationless de-excitation of the oxygen molecules.

: http://publica.fraunhofer.de/dokumente/N-143865.html