Bochum 2015 – wissenschaftliches Programm

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K: Fachverband Kurzzeitphysik

K 3: Lasersysteme und deren Anwendungen I

K 3.5: Vortrag

Dienstag, 3. März 2015, 12:05–12:25, HZO 40

Laser-induced breakdown spectroscopy of major and minor elements in steel slags: Influence of background gas and detection geometry — •Christoph M Ahamer¹, Simon Eschlböck-Fuchs¹, Philipp J Kolmhofer¹, Roman Roessler², Norbert Huber¹, and Johannes D Pedarnig¹ — ¹Institute of Applied Physics, Johannes Kepler University Linz, A-4040 Linz, Austria — ²voestalpine Stahl GmbH, A-4031 Linz, Austria

Slag from secondary metallurgy in industrial steel production is analyzed by laser-induced breakdown spectroscopy (LIBS). The optical emission of laser-induced plasma on slags is measured in different background gases and for different detection geometries. The major oxides are quantified by calibration-free LIBS (CF-LIBS) method. For one minor oxide calibration curves are established using different reference signals. Our results show that light detection by direct coupling to an optical fiber that is close to the plasma ('direct') and by collinear coupling in backward direction to a fiber at larger distance ('collinear') delivers very similar LIBS spectra, plasma parameters, and analytical results. LIBS spectra measured in different background gases (air, N2, Ar, He) are similar for direct and collinear detection. For the quantification of minor components and the limit of detection the background gas and the reference signal are found to be important. Acknowledgements: Financial support by the Austrian Research Promotion Agency FFG (Project 838861) is gratefully acknowledged.