Filters

20192

More filters

20232
Reset filters

Settings

Author: Uhrlandt, D. Ă— Has files: Yes Ă— Version: publishedVersion Ă— search.filters.applied.f.series: Plasma physics and technology 6 (2019), Nr. 1 Ă— WGL Institute: INP Ă—

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Comparative studies of low-intensity short-length arcs
    (Praha : Czech Technical University in Prague, Faculty of Electrical Engineering, Department of Physics, 2019) Baeva, M.; Siewert, E.; Uhrlandt, D.
    We present results obtained by two non-equilibrium modelling approaches and experiments on low-intensity short-length arcs in argon at atmospheric pressure. The first one considers a quasi-neutral arc column combined with boundary conditions on the electrodes based on the energy balance in the space-charge sheaths. The second approach applies a unified description over the entire gap and solves the Poisson equation for the self-consistent electric field. The experiments provide the arc voltage.
  • Thumbnail Image
    Item
    Analysis of C2 SWAN bands in ablation-dominated arcs in CO2 atmosphere
    (Praha : Czech Technical University in Prague, Faculty of Electrical Engineering, Department of Physics, 2019) Methling, R.; Franke, St.; Götte, N.; Wetzeler, S.; Uhrlandt, D.
    A model circuit breaker in a high-pressure chamber filled with CO2 atmosphere is used to operate a wall-stabilized arc of several kilo-amperes between tungsten-copper electrodes surrounded by polytetrafluoroethylene nozzles. Optical emission spectroscopy (OES) is carried out via quartz plates inserted into the nozzles using a combination of an imaging spectrometer either with a high-speed video camera or with an ICCD camera. Depending on the nozzle geometry and the current, continuum from C2 Swan bands was detected as absorption as well as emission pattern. After current zero, optical absorption spectroscopy (OAS) using a xenon flashlamp as broadband background radiator was applied. An absorption around 493 nm was detected and attributed to CuF molecules. The study proofs the existence of C2 in the active phase and the formation of CuF near to current zero.