Bochum 2015 – wissenschaftliches Programm
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K: Fachverband Kurzzeitphysik
K 3: Lasersysteme und deren Anwendungen I
K 3.2: Hauptvortrag
Dienstag, 3. März 2015, 10:50–11:25, HZO 40
Tomography of laser-induced plasma using Radon transform technique for temporally and spatially resolved plasma diagnostics — •Simon Eschlböck-Fuchs1, Philipp Kolmhofer1, Alexander Demidov3, Igor B. Gornushkin2, Thomas Schmid2, Ulrich Panne3, Roman Rössler4, Norbert Huber1, Johannes Heitz1, and Johannes D. Pedarnig1 — 1Institute of Applied Physics, Johannes Kepler University Linz, A-4040 Linz, Austria — 2BAM Federal Institute for Materials Research and Testing, 12489 Berlin, Germany — 3Humboldt-Universität zu Berlin, Department of Chemistry, 12489 Berlin, Germany — 4voestalpine Stahl GmbH, A-4031 Linz, Austria
The Radon transform technique was employed to investigate the spatial distribution of emissivity of a laser induced plasma on metallurgical slag samples. Plasmas are ignited by single-pulses (SP), doublepulses (DP) in collinear geometry, and by the combination of a laser pulse with a pulsed arc discharge (SP-AD). The latter is formed by generating a SP plasma between two metal electrodes triggering a pulsed arc discharge. Angular and time-resolved plasma photography was carried out. The Radon transform technique was applied for a three-dimensional reconstruction of plasma emissivity. The measurements were conducted for different delay times with respect to the laser pulse, ranging from a few microseconds for SP and DP up to tens of microseconds for SP-AD. Results for the plasma emissivity and shape are compared, revealing a more homogeneous distribution of emissivity for DP and SP-AD excited plasma.