TY - CONF A1 - Völker, Tobias A1 - Gornushkin, Igor B. A1 - Kazakov, Alexander Ya. A1 - Wilsch, Gerd T1 - Application of two calibration-free LIBS techniques for synthetic spectra of cement samples N2 - Two calibration-free LIBS techniques are used for the quantitative analysis of synthetic cement samples: the CF-LIBS based on the Boltzmann plot method and the Monte Carlo (MC) LIBS based on the iterative spectrum fitting. In CF-LIBS, the inverse problem is solved, i.e. the elemental concentrations are determined by the reconstruction of plasma parameters from spectra. The MC-LIBS technique solves the direct problem by finding the highest correlation between the model-generated and experimental spectrum. The accuracy of both calibration-free LIBS methods suffers from factors such as inaccurately determined instrumental function, the deviation of experimental plasma from the mathematical model used, not taking into account the collection geometry and from the uncertainty of spectroscopic data. Therefore, the both calibration-free LIBS approaches are applied to synthetic spectra which perfectly suit the mathematical model of the method. This test yields the accuracy of both the approaches for the ideal case. In addition, the accuracy of both methods is investigated for non-isothermal plasma, because real laser-induced plasma often has high gradients in temperature. Both methods assume an isothermal plasma. T2 - Xth international conference on Laser-Induced Breakdown Spectroscopy CY - Atlanta, GA, USA DA - 21.10.2018 KW - Cement KW - MC-LIBS KW - LIBS KW - CF-LIBS PY - 2018 AN - OPUS4-46774 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -