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Proceedings Paper

Photoacoustic CO2 detection at 2.7 μm
Author(s): Marcus Wolff; Hinrich G. Groninga; Hermann Harde
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Paper Abstract

We present a new detection scheme for carbon dioxide(CO2) based on a custom-made room temperature distributed feedback (DFB) diode laser at 2.7 μm, currently representing the laser with the highest emission wavelength of its kind. The detector's especially compact and simple set-up is based on photoacoustic spectroscopy (PAS). This method makes use of the transformation of absorbed modulated radiation into a sound wave. The sensor enables a very high detection sensitivity for CO2 in the ppb range. Furthermore, the carefully selected spectral region as well as the narrow bandwidth and wide tunability of the single-mode laser ensure an excellent selectivity. Even measurements of different CO2 isotopes can be easily performed. This could enable future applications of this spectroscopic sensor in medical diagnostics (e.g. 13C-breath tests).

Paper Details

Date Published: 25 April 2006
PDF: 6 pages
Proc. SPIE 6189, Optical Sensing II, 61890X (25 April 2006); doi: 10.1117/12.661736
Show Author Affiliations
Marcus Wolff, PAS-Tech GmbH (Germany)
Hamburg Univ. of Applied Sciences (Germany)
Hinrich G. Groninga, PAS-Tech GmbH (Germany)
Hermann Harde, Helmut-Schmidt Univ. (Germany)

Published in SPIE Proceedings Vol. 6189:
Optical Sensing II
Brian Culshaw; Anna G. Mignani; Hartmut Bartelt; Leszek R. Jaroszewicz, Editor(s)

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