TY - CONF A1 - Gornushkin, Igor B. T1 - Modeling and Diagnostics of Laser Induced Plasma Supported by Optical Temography (invited) T2 - Petergof Workshop on Laser Physics 2014 CY - St. Petersburg, Russland DA - 2014-04-21 PY - 2014 AN - OPUS4-32121 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Merk, Sven A1 - Shabanov, Sergej V. A1 - Gornushkin, Igor B. A1 - Panne, Ulrich T1 - Laser-induced plasma tomography by the Radon transform N2 - The Radon transform is tested as a method for reconstruction of the emissivity distribution of asymmetric laser induced plasmas. Two types of experiments were carried out. First, the plasma asymmetry is introduced via focusing the laser by a cylindrical lens to create plasma plumes elongated along the symmetry axis of the lens. Second, an asymmetric power distribution across the laser beam is created by reflecting the latter from a damaged mirror. Various effects on the quality of the plasma emissivity reconstructed by the Radon tomography method are investigated. The understanding of these effects appears to be essential to design a proper experimental setup to study LIBS plasmas by the Radon tomography method. It is demonstrated that the Radon tomography can successfully be used for experimental studies of asymmetric LIBS plasmas. KW - Radon transform KW - Laser induced plasma KW - LIBS KW - Plasma tomography PY - 2011 DO - https://doi.org/10.1039/c1ja10187k SN - 0267-9477 SN - 1364-5544 VL - 26 SP - 2483 EP - 2492 PB - Royal Society of Chemistry CY - London AN - OPUS4-24889 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Quackatz, Lukas A1 - Gornushkin, Igor B. A1 - Griesche, Axel A1 - Kannengießer, Thomas A1 - Treutler, Kai A1 - Wesling, Volker T1 - In situ chemical analysis of duplex stainless steel weld by laser induced breakdown spectroscopy N2 - The high corrosion resistance and good mechanical properties of duplex stainless steel (DSS) are due to its special chemical composition, which is a balanced phase ratio of ferrite (α) and austenite (γ). Many industrial applications require the integration of DSS components. For this, Gas tungsten arc welding (GTAW) is an excellent choice, as it allows an automated operation with high reproducibility. However, when the weld pool solidifies, critical ratios of α- and γ- phases can occur, which lead to solidification cracking, increased susceptibility to corrosion, and a decrease in ductility and critical strength. Previous studies have shown that these defects can be caused by the accumulation of manganese and chromium in the heat affected zone (HAZ), requiring ongoing monitoring of this accumulation. A suitable method for such monitoring is laser-induced breakdown spectroscopy (LIBS), which can be used in two operating modes: calibration using standard reference samples and calibration-free. Unlike conventional quantitative LIBS measurements, which require reference samples to generate a calibration curve, calibration-free LIBS (CF-LIBS) allows chemical compositions to be determined solely from the emission spectrum of the plasma. Numerous publications show that CF-LIBS is a fast and efficient analytical method for the quantitative analysis of metal samples. In this work, CF-LIBS is applied to spectra obtained during GTAW DSS welding and the result is compared with those obtained by PLS analysis. A good correlation was found between both types of analysis, demonstrating the suitability of the CF-LIBS method for this application. The CF-LIBS method has a significant advantage over conventional LIBS due to the rapid in situ measurement of concentrations of major alloying elements without calibration procedure. This, combined with fast feedback and appropriate adjustment of welding parameters, helps prevent welding defects. KW - Duplex stainless steels KW - In situ measurement KW - LIBS KW - GMAW PY - 2024 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-597940 DO - https://doi.org/10.1016/j.sab.2024.106899 SN - 0584-8547 VL - 214 SP - 1 EP - 7 PB - Elsevier B.V. AN - OPUS4-59794 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Modeling and Chemometrics - Pathways to Calibration T2 - EMSLIBS 2013 CY - Bari, Italy DA - 2013-09-16 PY - 2013 AN - OPUS4-28783 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Plasma Diagnostics: Fundamentals, Measurements, and Applications T2 - Winter Plasma Conference 2014 CY - Amelia Island, FL, USA DA - 2014-01-04 PY - 2014 AN - OPUS4-30393 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Conventinal and calibration-free LIBS at BAM T2 - Kolloquium der Johannes Kepler Univerität CY - Linz, Austria DA - 2013-07-21 PY - 2013 AN - OPUS4-30394 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Spectrochemical Analysis and Diagnostics via Modeling of Laser Induced Plasma T2 - Winter Plasma Conference 2014 CY - Amelia Island, FL, USA DA - 2014-01-04 PY - 2014 AN - OPUS4-30395 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Spatially Resolved vs Spatially Integrated Measurements of Parameters of Laser Induced Plasma T2 - SCIX (FACSS) CY - Milwaukee, WI, USA DA - 2013-09-29 PY - 2013 AN - OPUS4-30399 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Spectrochemical Analysis and Diagnostics via Modeling of Laser Induced Plasma T2 - SCIX (FACSS) CY - Milwaukee, WI, USA DA - 2013-09-29 PY - 2013 AN - OPUS4-30401 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Plasma Modeling for Calibration-Free LIBS: Expectations and Reality T2 - SCIX (FACSS) CY - Milwaukee, WI, USA DA - 2013-09-29 PY - 2013 AN - OPUS4-30402 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Modeling and Diagnostics of Laser Induced Plasma Supported by Optical Tomography T2 - EMSLIBS CY - Bari, Italy DA - 2013-09-16 PY - 2013 AN - OPUS4-30397 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Diagnostics and Modeling of Laser Induced Plasma Based on Optical Tomography T2 - FLAMN CY - Saint Petersburg, Russia DA - 2013-06-22 PY - 2013 AN - OPUS4-30396 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Absorption Laser-Induced Breakdown Spectroscopy T2 - SCIX (FACSS) CY - Milwaukee, WI, USA DA - 2013-09-29 PY - 2013 AN - OPUS4-30398 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Porizka, Pavel A1 - Klessen, Benjamin A1 - Kaiser, J. A1 - Gornushkin, Igor B. A1 - Panne, Ulrich A1 - Riedel, Jens T1 - High repetition rate laser-induced breakdown spectroscopy using acousto-optically gated detection N2 - This contribution introduces a new type of setup for fast sample analysis using laser-induced breakdown spectroscopy (LIBS). The novel design combines a high repetition rate laser (up to 50 kHz) as excitation source and an acousto-optical modulator (AOM) as a fast switch for temporally gating the detection of the emitted light. The plasma radiation is led through the active medium of the AOM where it is diffracted on the transient ultrasonic Bragg grid. The diffracted radiation is detected by a compact Czerny-Turner spectrometer equipped with a CCD line detector. Utilizing the new combination of high repetition rate lasers and AOM gated detection, rapid measurements with total integration times of only 10 ms resulted in a limit of detection (LOD) of 0.13 wt.% for magnesium in aluminum alloys. This short integration time corresponds to 100 analyses/s. Temporal gating of LIP radiation results in improved LODs and consecutively higher sensitivity of the LIBS setup. Therefore, an AOM could be beneficially utilized to temporally detect plasmas induced by high repetition rate lasers. The AOM in combination with miniaturized Czerny-Turner spectrometers equipped with CCD line detectors and small footprint diode pumped solid state lasers results in temporally gateable compact LIBS setups. KW - Laser Induced Breakdown Spectroscopy KW - LIBS KW - Aluminium KW - Charge coupled devices KW - Magnesium KW - Light diffraction PY - 2014 DO - https://doi.org/10.1063/1.4890337 SN - 0034-6748 SN - 1089-7623 VL - 85 IS - 7 SP - 073104-1 EP - 073104-8 PB - American Institute of Physics CY - Melville, NY AN - OPUS4-31358 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Calibration-free Monte Carlo method for laser induced breakdown spectroscopy N2 - Calibration-free LIBS via Monte Carlo approach T2 - 8-14.10.2017 SciX, Reno, NV, USA CY - Reno, NV, USA DA - 7.10.2016 KW - Laser induced plasma KW - LIBS KW - Plasma modeling KW - Plasma diagnostics KW - Lasers PY - 2017 AN - OPUS4-42298 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Calibration-free Monte Carlo method for laser induced breakdown spectroscopy N2 - Calibration-free LIBS by Monte Carlo simulation of plasma spectra T2 - April 26 2017, Johannes Kepler University, Linz, Austria CY - Johannes Kepler University, Linz, Austria DA - 26.04.2017 KW - Laser induced plasma KW - LIBS KW - Plasma modeling KW - Plasma diagnostics PY - 2017 AN - OPUS4-42288 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Model of stimulated emission in aluminium laser-induced plasma produced by resonance pumping N2 - Model of lasing effect in resonantly pumped aluminum laser induced plasma T2 - EMS LIBS CY - Pisa, Italy DA - 11.06.2017 KW - Laser induced plasma KW - LIBS KW - Plasma modeling KW - Plasma diagnostics PY - 2017 AN - OPUS4-42292 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Two calibration-free approaches for analysis of industrial oxides by the laser-induced breakdown spectroscopy T2 - EMSLIBS CY - Linz, Austria DA - 2015-09-14 PY - 2015 AN - OPUS4-35143 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Calibration- and Calibration-Free LIBS: Past and Future (invited) T2 - SciX-FACSS CY - Providence, RI, USA DA - 2015-09-27 PY - 2015 AN - OPUS4-35141 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gornushkin, Igor B. T1 - Recent Advancements in Modeling of Laser Induced Plasmas and Supporting Plasma Diagnostics (invited) T2 - EMSLIBS CY - Linz, Austria DA - 2015-09-14 PY - 2015 AN - OPUS4-35140 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Demidov, Alexandr A1 - Eschlböck-Fuchs, S. A1 - Kazakov, Alexander Ya. A1 - Gornushkin, Igor B. A1 - Kolmhofer, P. J. A1 - Pedarnig, J. D. A1 - Huber, N. A1 - Heitz, J. A1 - Schmid, Thomas A1 - Rössler, R. A1 - Panne, Ulrich T1 - Monte Carlo standardless approach for laser induced breakdown spectroscopy based on massive parallel graphic processing unit computing N2 - The improved Monte-Carlo (MC) method for standard-less analysis in laser induced breakdown spectroscopy (LIBS) is presented. Concentrations in MC LIBS are found by fitting model-generated synthetic spectra to experimental spectra. The current version of MC LIBS is based on the graphic processing unit (GPU) computation and reduces the analysis time down to several seconds per spectrum/sample. The previous version of MC LIBS which was based on the central processing unit (CPU) computation requested unacceptably long analysis times of 10's minutes per spectrum/sample. The reduction of the computational time is achieved through the massively parallel computing on the GPU which embeds thousands of co-processors. It is shown that the number of iterations on the GPU exceeds that on the CPU by a factor > 1000 for the 5-dimentional parameter space and yet requires > 10-fold shorter computational time. The improved GPU-MC LIBS outperforms the CPU-MS LIBS in terms of accuracy, precision, and analysis time. The performance is tested on LIBS-spectra obtained from pelletized powders of metal oxides consisting of CaO, Fe2O3, MgO, and TiO2 that simulated by-products of steel industry, steel slags. It is demonstrated that GPU-based MC LIBS is capable of rapid multi-element analysis with relative error between 1 and 10's percent that is sufficient for industrial applications (e.g. steel slag analysis). The results of the improved GPU-based MC LIBS are positively compared to that of the CPU-based MC LIBS as well as to the results of the standard calibration-free (CF) LIBS based on the Boltzmann plot method. KW - Monte Carlo simulation KW - Parallel computing KW - Calibration-free laser-induced breakdown spectroscopy KW - Post-breakdown laser induced plasma KW - Quaternary oxides PY - 2016 DO - https://doi.org/10.1016/j.sab.2016.09.016 VL - 125 SP - 97 EP - 102 PB - Elsevier B.V. AN - OPUS4-38489 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -