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P: Fachverband Plasmaphysik
P 2: Atmospheric-pressure plasma and applications 1
P 2.5: Vortrag
Montag, 9. März 2020, 12:15–12:30, b305
Spatio-temporal emission of an atmospheric plasmoid — •Roland Friedl1, Ursel Fantz1,2, Saskia Steibel1, Martin Kammerloher2, and Alexander Oswald2 — 1AG Experimentelle Plasmaphysik, Universität Augsburg, 86135 Augsburg — 2Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching
An atmospheric pressure plasmoid is generated via a high voltage discharge (4.8 kV) above a water surface. After around 150 ms the connection to the power supply is interrupted and the plasmoid enters an autonomous phase which lasts up to 400 ms. The plasmoid has a diameter of around 30 cm and ascends in air with a velocity of about 1–2 m/s due to buoyancy. High speed video analysis (600 fps) and optical emission spectroscopy is applied to gain insight into the plasma dynamics.
Survey spectrometers (Δλ ∼ 1.4 nm) are used to determine the dominant radiating plasma constituents for the three main evolution phases of the plasmoid: ignition, formation, and autonomous phase. Photo diodes with interference filters (Δλ ∼ 10 nm) are used for monitoring the emission of specific plasma constituents (H, OH, Na) with high temporal resolution (0.5 ms). Applying several diodes, the vertical dynamic as well as the horizontal structure and symmetry of the plasmoid emission is obtained. High resolution spectroscopy (Δλ ∼ 0.16 nm) with a high speed trigger system is applied to measure the OH-A-X emission system during the temporal evolution of the plasmoid. In order to gain access to the plasma chemistry, rotational and vibrational temperatures of the hydroxyl molecule are evaluated using Lifbase.