High enthalpy source dedicated to quantitative infrared emission spectroscopy of gas flows at elevated temperatures

Robert Georges (1) , Jonathan Thiévin (1) , Abdessamad Benidar (1) , Sophie Carles (1) , B. Amyay (2) , M. Louviot (2) , Vincent Boudon (2) , J. Vander Auwera (3)

1 IPR - Institut de Physique de Rennes
2 ICB - Laboratoire Interdisciplinaire Carnot de Bourgogne
3 ULB - Université libre de Bruxelles

The High Enthalpy Source (HES) is a novel high temperature source developed to measure infrared line-by-line integrated absorption cross sections of flowing gases up to 2000 K. The HES relies on a porous graphite furnace designed to uniformly heat a constant flow of gas. The flow compensates thermal dissociation by renewing continuously the gas sample and eliminating dissociation products. The flowing characteristics have been investigated using computational fluid dynamics simulation confirming good temperature uniformity. The HES has been coupled to a high-resolution Fourier transform spectrometer to record emission spectra of methane at temperatures ranging between 700 and 1400 K. A radiative model has been developed to extract absolute line intensities from the recorded spectra. © 2019 Author(s).

Keywords: Temperature uniformity; Thermal dissociation; Dissociation; Emission spectroscopy; Enthalpy; Fourier transform infrared spectroscopy; Spectrometers; Absolute line intensities; Absorption cross sections; Computational fluid dynamics simulations; Dissociation products; Fourier transform spectrometers; Infrared emission spectroscopy; Computational fluid dynamics; Flow of gases; Molecular physics; CRESU

Domains: Physics [physics]

Robert Georges, Jonathan Thiévin, Abdessamad Benidar, Sophie Carles, B. Amyay, et al.. High enthalpy source dedicated to quantitative infrared emission spectroscopy of gas flows at elevated temperatures. Review of Scientific Instruments, 2019, 90 (9), pp.093103. ⟨10.1063/1.5097696⟩. ⟨hal-02309943⟩