Erlangen 2018 – scientific programme

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P: Fachverband Plasmaphysik

P 17: Atmospheric Pressure Plasmas - Poster

P 17.3: Poster

Wednesday, March 7, 2018, 16:15–18:15, Zelt Ost

Interferometric and holographic techniques for the diagnostics of axially blown arcs — •Jan Carstensen, Bernardo Galletti, Alexey Sokolov, Charles Doiron, Oguz-Han Asnaz, and Axel Jansson — ABB Corporate Research, Segelhofstr. 1K, 5405 Baden-Daettwil, Switzerland

Recently, we have used two color spatial carrier wave interferometry to measure the electron density and heavy particle density in the stagnation point of a stable, axially blown arc in argon for currents of 50 A to 200 A and stagnation point pressures of 0.2 to 1.6 MPa. [J. Carstensen et al., Phys. Rev. Appl. 8, 024002 (2017)]. In this contribution we will discuss options to improve the sensitivity and the accuracy of the optical setup. In particular, by changing the frequency of the two lasers the minimal detectable electron density can be lowered by one order of magnitude. Furthermore, holographic techniques can simplify the alignment of the optical components and certain imperfection along the optical path can be corrected numerically in the data processing step.