caa a22 4500 445368608 CHVBK 20180317142938.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s00340-011-4532-1 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4532-1 CO2 isotope sensor using a broadband infrared source, a spectrally narrow 4.4 μm quantum cascade detector, and a Fourier spectrometer [Elektronische Daten] [D. Hofstetter, J. Di Francesco, L. Hvozdara, H.-P. Herzig, M. Beck] 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 2260cm−1 (4.4μm) and has a full width at half maximum of 200cm−1 (25meV). It covers strong absorption bands of two spectrally overlapping CO2 isotopomers, namely the P-branch of 12CO2 and the R-branch of 13CO2. 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. Adetection limit of 500ppb was obtained in these experiments. Springer-Verlag, 2011 Hofstetter D. Institute of Physics, University of Neuchâtel, 51 Avenue de Bellevaux, 2009, Neuchâtel, Switzerland aut Di Francesco J. Institute of Physics, University of Neuchâtel, 51 Avenue de Bellevaux, 2009, Neuchâtel, Switzerland aut Hvozdara L. Optics and Photonics Technology Laboratory, Institute of Microtechnology, EPFL, A.-L. Breguet 2, 2000, Neuchâtel, Switzerland aut Herzig H.-P Optics and Photonics Technology Laboratory, Institute of Microtechnology, EPFL, A.-L. Breguet 2, 2000, Neuchâtel, Switzerland aut Beck M. Quantum Optoelectronics Group, Institute of Quantum Electronics, ETHZ, Wolfgang-Pauli-Strasse 16, 8093, Zurich, Switzerland aut Applied Physics B Springer-Verlag 103/4(2011-06-01), 967-970 0946-2171 103:4<967 2011 103 340 https://doi.org/10.1007/s00340-011-4532-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4532-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hofstetter D. Institute of Physics, University of Neuchâtel, 51 Avenue de Bellevaux, 2009, Neuchâtel, Switzerland aut NATIONALLICENCE 700 1- Di Francesco J. Institute of Physics, University of Neuchâtel, 51 Avenue de Bellevaux, 2009, Neuchâtel, Switzerland aut NATIONALLICENCE 700 1- Hvozdara L. Optics and Photonics Technology Laboratory, Institute of Microtechnology, EPFL, A.-L. Breguet 2, 2000, Neuchâtel, Switzerland aut NATIONALLICENCE 700 1- Herzig H.-P Optics and Photonics Technology Laboratory, Institute of Microtechnology, EPFL, A.-L. Breguet 2, 2000, Neuchâtel, Switzerland aut NATIONALLICENCE 700 1- Beck M. Quantum Optoelectronics Group, Institute of Quantum Electronics, ETHZ, Wolfgang-Pauli-Strasse 16, 8093, Zurich, Switzerland aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 103/4(2011-06-01), 967-970 0946-2171 103:4<967 2011 103 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer