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

Tobias Milde; Morten Hoppe; Herve Tatenguem; Christian Assmann; Wolfgang Schade; Joachim Sacher

doi:10.1117/12.2507180

1 March 2019 Comparison of the spectral excitation behavior of methane according to InP, IC, and QC lasers as excitation source by QEPAS

Tobias Milde, Morten Hoppe, Herve Tatenguem, Christian Assmann, Wolfgang Schade, Joachim Sacher

Author Affiliations +

Proceedings Volume 10917, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII; 109171M (2019) https://doi.org/10.1117/12.2507180
Event: SPIE OPTO, 2019, San Francisco, California, United States

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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Citation Download Citation

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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