Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 6: Poster I
P 6.6: Poster
Monday, February 26, 2024, 16:30–18:30, ELP 6: Foyer
Investigation of the morphology of a pulsed discharge in water using stereoscopic images — •Robert Werberger1,2, Raphael Rataj2, and Klaus-Dieter Weltmann1,2 — 1Universität Greifswald — 2Leibniz-Institut für Plasmaforschung und Technologie e. V.
In the past, the morphology of streamer discharges in water was mainly analysed using 2D imaging systems, which resulted in measurement uncertainties due to the loss of depth information on the structure of the discharges. To take the spatial information into account, 3D images of the discharges are required. This study utilised a stereoscopic camera system to determine the disparity between two images resulting from different viewing angles. An automated analysis procedure was used to determine the corresponding points between the images, which was then used to create a 3D reconstruction of the discharges, thereby obtaining spatial information. The streamer discharges were generated at a needle-to-plate electrode with a positive, pulsed voltage signal with an amplitude ranging from 35 to 45 kV and a pulse duration of 100 ns. In the study, effects of voltage amplitude and liquid conductivity on the spatial positions of discharge channel branches and their splitting angles were investigated. Additionally, a comparison between two- and three-dimensional results will be presented.
Keywords: plasma in water; positiv streamer discharge; 3D reconstruction; stereoscopic camera system; branching of discharge