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K: Fachverband Kurzzeitphysik

K 6: Lasermaterialbearbeitung II

K 6.2: Vortrag

Mittwoch, 30. März 2011, 14:15–14:30, HS D

Calibration free laser-induced breakdown spectroscopy of industrial oxide materials — •Philipp Kolmhofer, Bernhard Praher, Johannes Heitz, and Johannes D. Pedarnig — Christian Doppler Laboratory for Laser-Assisted Diagnostics, Institute of Applied Physics, Johannes Kepler University, A-4040 Linz, Austria

Laser-induced breakdown spectroscopy (LIBS) is used for various applications in industry, including fast compositional analysis of materials (major, minor, and trace elements). For quantitative element analysis, calibration standards have to be measured, or calibration-free LIBS (CF-LIBS) methods have to be employed. We modified the CF-LIBS algorithm and achieved increased accuracy in the determination of oxide concentration for materials containing MgO, CaO, and Fe2O3 [1]. This algorithm was applied for analysis of multi-component industrial oxide materials. For all investigated materials CF-LIBS concentration results agree well with reference values. The relative errors are <15 % for major oxides CaO, Al2O3, MgO, and SiO2. For minor oxides the relative errors are larger. Variation of experimental parameters (e.g., laser fluence) over large range does not significantly change the CF-LIBS data. The results indicate that CF-LIBS can be employed for quantitative analysis of complex materials.

[1] B. Praher, V. Palleschi, R. Viskup, J. Heitz, J.D. Pedarnig, Spectrochimica Acta Part B 65 671-679 (2010).