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Open AccessFeature PaperArticle

Axisymmetric Linear Hyperspectral Absorption Spectroscopy and Residuum-Based Parameter Selection on a Counter Flow Burner

1
Department of Reactive Flows and Diagnostics, Technische Universität Darmstadt, 64287 Darmstadt, Germany
2
Institute for Combustion Technology, RWTH Aachen University, 52056 Aachen, Germany
*
Author to whom correspondence should be addressed.
Energies 2019, 12(14), 2786; https://doi.org/10.3390/en12142786
Received: 10 June 2019 / Revised: 10 July 2019 / Accepted: 15 July 2019 / Published: 19 July 2019
(This article belongs to the Special Issue Tomographic and Volumetric Diagnostics in Flames)
Chemical species tomography enables non-invasive measurements of temperatures and concentrations in gas phase processes. In this work, we demonstrate the recently introduced linear hyperspectral absorption tomography (LHAT) on an axisymmetric counterflow burner used for speciation studies of Oxyfuel combustion. As LHAT reconstructs spectrally resolved local absorption coefficient spectra, the physical plausibility of these reconstructed spectra degrades with an over-regularization of the tomographic problem. As presented in this work, this behavior can be employed in a novel regularization parameter choice method based on the residuals of local spectroscopic fits to the reconstructed spectra. After determining the regularization parameter, the reconstructions of the temperature and water mole fraction profiles of different flames are compared to numerical simulations, showing a good agreement. View Full-Text
Keywords: tomography; parameter selection; absorption spectroscopy; tunable diode laser; Oxyfuel tomography; parameter selection; absorption spectroscopy; tunable diode laser; Oxyfuel
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Emmert, J.; Baroncelli, M.; v.d. Kley, S.; Pitsch, H.; Wagner, S. Axisymmetric Linear Hyperspectral Absorption Spectroscopy and Residuum-Based Parameter Selection on a Counter Flow Burner. Energies 2019, 12, 2786.

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