Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 103, Issue 4, Pages 967-970Publisher
SPRINGER
DOI: 10.1007/s00340-011-4532-1
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We report a prototype CO2 gas sensor based on a simple blackbody infrared source and a spectrally narrow quantum cascade detector (QCD). The detector absorption spectrum is centered at 2260 cm(-1) (4.4 mu m) and has a full width at half maximum of 200 cm(-1) (25 meV). It covers strong absorption bands of two spectrally overlapping CO2 isotopomers, namely the P-branch of (CO2)-C-12 and the R-branch of (CO2)-C-13. Acquisition of the spectral information and data treatment were performed in a Fourier transform infrared (FTIR) spectrometer. By flushing its sample compartment either with nitrogen, dry fresh air, ambient air, or human breath, we were able to determine CO2 concentrations corresponding to the different gas mixtures. A detection limit of 500 ppb was obtained in these experiments.
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