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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
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2
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1,2,*
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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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