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Sensors 2010, 10(9), 8466-8477; doi:10.3390/s100908466
Article

Detection of Molecular Oxygen at Low Concentrations Using Quartz Enhanced Photoacoustic Spectroscopy

1
,
2
,
1
 and
1,2,*
1 Clausthal University of Technology, Institute for Energy Research and Physical Technology, Energy-Campus, Am Stollen 19, 38640 Goslar, Germany 2 Fraunhofer Heinrich Hertz Institute, Energy-Campus, Am Stollen 19, 38640 Goslar, Germany
* Author to whom correspondence should be addressed.
Received: 10 August 2010 / Revised: 30 August 2010 / Accepted: 8 September 2010 / Published: 9 September 2010
(This article belongs to the Section Physical Sensors)
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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.
Keywords: Gas sensing; photoacoustic spectroscopy; QEPAS; oxygen sensing Gas sensing; photoacoustic spectroscopy; QEPAS; oxygen sensing
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Pohlkötter, A.; Köhring, M.; Willer, U.; Schade, W. Detection of Molecular Oxygen at Low Concentrations Using Quartz Enhanced Photoacoustic Spectroscopy. Sensors 2010, 10, 8466-8477.

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