Photoacoustic CO<sub>2</sub> detection at 2.7 &#956;m

Marcus Wolff; Hinrich G. Groninga; Hermann Harde

doi:10.1117/12.661736

25 April 2006 Photoacoustic CO₂ detection at 2.7 μm

Marcus Wolff, Hinrich G. Groninga, Hermann Harde

Proceedings Volume 6189, Optical Sensing II; 61890X (2006) https://doi.org/10.1117/12.661736
Event: SPIE Photonics Europe, 2006, Strasbourg, France

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).

Citation Download Citation

Marcus Wolff, Hinrich G. Groninga, and Hermann Harde "Photoacoustic CO₂ detection at 2.7 μm", Proc. SPIE 6189, Optical Sensing II, 61890X (25 April 2006); https://doi.org/10.1117/12.661736

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