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

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