Optical emission tomography: looking into plasmas with complex structures

M. van der Schans, A. Sobota, G.M.W. Kroesen

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Measuring the light emitted by a plasma often offers a convenient way to obtain information on the plasma properties. To procure these plasma properties, as well as their spatial distribution in a volume discharge, the local emission coefficient is required. However, the intensity recorded by a detector is a lateral scan of the emission integrated along a line-of-sight. A commonly used technique to retrieve radial dependence in case of cylindrical symmetry is Abel inversion. When the discharge structure exhibits a more complex symmetry or no symmetry at all, a more generalised approach is required: the inverse Radon transform. Since optical access from numerous angles is now required, this technique is especially applicable to discharges in open air. A brief explanation of the Radon and inverse Radon transforms is given and the reconstructed local emission coefficient of a structured volume dielectric barrier discharge (DBD) in open air is presented. Finally, the local emission coefficient is compared to the local electric field strength obtained from simulations.
Original languageEnglish
Title of host publicationProceedings of the 27th NNV-Symposium on Plasma Physics and Radiation Technology, 10-11 March 2015, Lunteren, The Netherlands
Number of pages1
Publication statusPublished - 2015
Event27th NNV Symposium on Plasma Physics and Radiation Technology - De Werelt, Lunteren, Netherlands
Duration: 10 Mar 201511 Mar 2015


Conference27th NNV Symposium on Plasma Physics and Radiation Technology
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