Berlin 2014 – scientific programme
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K: Fachverband Kurzzeitphysik
K 5: Laser-Materie-Wechselwirkung und Laseranwendungen II
K 5.6: Talk
Tuesday, March 18, 2014, 15:15–15:30, SPA SR203
Calibration-free analysis of major components in steel slag by laser-induced breakdown spectroscopy by combination of UV and VIS spectra — •Philipp Kolmhofer1, Simon Eschlböck-Fuchs1, Roman Rössler2, Johannes Pedarnig1, and Johannes Heitz1 — 1Christian Doppler Laboratory for Laser-Assisted Diagnostics, Institute of Applied Physics, Johannes Kepler University Linz, A-4040 Linz, Austria — 2voestalpine Stahl GmbH, A-4031 Linz, Austria
Slag samples from industrial steel production (secondary metallurgy) are analyzed by calibration-free laser-induced breakdown spectroscopy (CF-LIBS) using a transportable LIBS measurement system. The system uses nanosecond Nd:YAG laser pulses (1064 nm) for ablation and a fiber coupled Echelle spectrometer with ICCD camera for optical spectrum detection. The emission lines of major elements are detected in the VIS and UV range of the spectrometer (350-850 nm, 220-350 nm). An automated procedure corrects the measured spectra for self-absorption effects, determines the plasma temperature Te (Saha-Boltzmann plots), and calculates the concentration of major oxides in the slags. The nominal oxide concentration is determined by reference analysis. The Te values derived from either Ti, Mn, or Ca lines are very similar and show small uncertainty. The measured oxide concentrations are in reasonable agreement with reference data.