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Comparison of the spectral excitation behavior of methane according to InP, IC, and QC lasers as excitation source by QEPAS
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Paper 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.

Paper Details

Date Published: 1 March 2019
PDF: 8 pages
Proc. SPIE 10917, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII, 109171M (1 March 2019); doi: 10.1117/12.2507180
Show Author Affiliations
Tobias Milde, Sacher Lasertechnik GmbH (Germany)
Technische Univ. Clausthal (Germany)
Morten Hoppe, Sacher Lasertechnik GmbH (Germany)
Herve Tatenguem, Sacher Lasertechnik GmbH (Germany)
Christian Assmann, Sacher Lasertechnik GmbH (Germany)
Wolfgang Schade, Technische Univ. Clausthal (Germany)
Joachim Sacher, Technische Univ. Clausthal (Germany)

Published in SPIE Proceedings Vol. 10917:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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