In this work, we proposed a new data acquisition approach that significantly improves the repetition rates of Laser-Induced Breakdown Spectroscopy (LIBS) experiments, where high-end echelle spectrometers and intensified detectors are commonly used. The moderate repetition rates of recent LIBS systems are caused by the utilization of intensified detectors and their slow full frame (i.e. echellogram) readout speeds with consequent necessity for echellogram-to-1D spectrum conversion (intensity vs. wavelength). Therefore, we investigated a new methodology where only the most effective pixels of the echellogram were selected and directly used in the LIBS experiments. Such data processing resulted in significant variable down-selection (more than four orders of magnitude). Samples of 50 sedimentary ores samples (distributed in 13 ore types) were analyzed by LIBS system and then classified by linear and non-linear Multivariate Data Analysis algorithms. The utilization of selected pixels from an echellogram yielded increased classification accuracy compared to the utilization of common 1D spectra.

AtomTrace a s Kolejní 9 612 00 Brno Czech Republic

BurgSys a s Hněvkovského 30 65 617 00 Brno Czech Republic

Central European Institute of Technology Brno University of Technology Purkyňova 123 Brno 612 00 Czech Republic

Faculty of Electrical Engineering and Communication Brno University of Technology Technická 12 616 00 Brno Czech Republic

Faculty of Mechanical Engineering Brno University of Technology Technická 2896 2 616 69 Brno Czech Republic

Sensor Information and Communication Systems Brno University of Technology Technická 12 616 00 Brno Czech Republic

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