Düsseldorf 2007 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 16: Poster
P 16.17: Poster
Mittwoch, 21. März 2007, 16:30–18:30, Poster A
Experimental studies of plasma torches by means of optical emission spectroscopy — •Martina Leins1, Ronny Brandenburg2, Klaus-Martin Baumgärtner3, Andreas Schulz1, Matthias Walker1, Uwe Schumacher1, Ulrich Stroth1, Jörg Ehlbeck2, and Klaus-Dieter Weltmann2 — 1Universität Stuttgart, Institut für Plasmaforschung, D-70569 Stuttgart — 2Institut für Niedertemperatur-Plasmaphysik, D-17489 Greifswald — 3Muegge Electronic GmbH, D-64385 Reichelsheim
Plasma torches at atmospheric pressure are considered for different gas treatment processes, e.g. reduction of exhaust fumes. In order to characterize the plasma torch and to get a better understanding of the plasma processes involved in such a plasma, optical emission spectroscopy is used. The plasma torch is driven by a 2.45 GHz magnetron with maximum power output of 2 kW. The plasma is generated in a cylindric resonator equipped with a centre quartz tube and a brazen nozzle for the gas inlet (synthetic air or nitrogen). Overview spectra (λ = 220...800 nm) are investigated through holes on the side of the resonator as well as in the upper end of the flame. In air as working gas the UV-region is dominated by radiation of the molecular bands of NO and OH. The visible region is characterized by a broad continuum. Furthermore lines of atomic oxygen, copper and iron are investigated, the latter two due to an erosion of the nozzle. The OH-spectrum is used for a rough estimation of the gas temperature (about 4000 K in the resonator, 4000...2500 K in the flame). An increase of the power leads to an expansion of the flame but has no effect on the temperature.