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P: Fachverband Plasmaphysik

P 17: Low Temperature Plasmas II

P 17.3: Vortrag

Donnerstag, 11. März 2010, 15:05–15:20, B 305

Spatio-temporal Development of a Surface Barrier Discharge at Atmospheric Pressure in Air — •Helge Grosch, Tomáš Hoder, Ronny Brandenburg, and Klaus-Dieter Weltmann — INP Greifswald, Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany

Surface barrier discharges (SBDs) have a large field of application. They are used for pollution control, surface treatment. In recent years biomedical applications or their use as gas flow actuators and attenuators is under intensive study worldwide. Similar as in classical barrier discharges the plasma of a SBD in air consist of single microdischarges (MDs). In order to study the MD development a special SBD arrangement consisting of two needle electrodes in an asymmetric set-up on opposite sides of a 0.6 mm alumina plate was prepared. SBD was driven by a sinusoidal voltage of several kV in dry air at atmospheric pressure. The spatial and temporal development was measured with the cross-correlation-spectroscopy (CCS) and an iCCD camera equipped with a far field microscope. The CCS apparatus is characterized by a high spatial and temporal resolution (0.01 ns and 0.01 mm) as well as reasonable spectral resolution. For the first time the development of a single filament can be shown for both polarities of the SDB. In both polarities a surface ionizing waves starting from the exposed needle electrode are observed and their velocities are discussed.