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1 March 2019 Comparison of the spectral excitation behavior of methane according to InP, IC, and QC lasers as excitation source by QEPAS
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Abstract
The MIR wavelength regime promises lower gas detection limits than the NIR or the VIS region due to higher absorption levels as one can read for simulation listed in HITRAN. Methane shows moderate absorbance below 3 μm which results into detection limits in the range of low ppm. IC and QC based lasers emit higher wavelengths, where the absorbances of methane are higher. TDLAS and QEPAS measurements to the trace gas CH4 are shown to display the spectroscopy performance of the different lasers with and without influences from the detector material. In this manuscript only QEPAS measurements will be presented. Scope of this paper is a quantitative comparison of the absorption and QEPAS behaviour of Methane in four important spectral regimes.
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© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tobias Milde, Morten Hoppe, Herve Tatenguem, Christian Assmann, Wolfgang Schade, and Joachim Sacher "Comparison of the spectral excitation behavior of methane according to InP, IC, and QC lasers as excitation source by QEPAS", Proc. SPIE 10917, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII, 109171M (1 March 2019); https://doi.org/10.1117/12.2507180
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