Production control of metal alloys by laser spectroscopy of the molten metals. Part I. Preliminary investigations |
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| Affiliation: | 1. Department of Physics, Florida A&M University, 2077 E. Paul Dirac Drive, Tallahassee, FL 32310, United States;2. Alakai Defense Systems, 197 Replacement Ave, Suite 102, Fort Leonard Wood, MO 65473, United States;1. Technische Universität Bergakademie Freiberg (TUBAF), Institute of Thermal-, Environmental- and Resources‘ Process Engineering (ITUN), Leipziger Strasse 28, 09599 Freiberg, Germany;2. Technische Universität Bergakademie Freiberg (TUBAF), Zentrum für effiziente Hochtemperatur-Stoffwandlung (ZeHS), Am St. Niclas-Schacht 13, 09599 Freiberg, Germany;3. Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Lehrstuhl für Technische Thermodynamik (LTT), Am Weichselgarten 8, 91058 Erlangen, Germany;4. Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen Graduate School in Advanced Optical Technologies (SAOT), Paul-Gordan-Strasse 6, 91052 Erlangen, Germany;1. Applied Spectra, Inc., Fremont, CA 94538, USA;2. Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;3. National Energy Technology Laboratory, Pittsburgh, PA 15236, USA;1. R&D, Strategic Development, Vattenfall AB, 814 26 Älvkarleby, Sweden;2. Division of Combustion Physics, Lund University, Box 118, S-221 00 Lund, Sweden |
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| Abstract: | After a short up-to-date survey of the method elaborated for chemical analysis of molten metals, the reason for the choice of time resolved laser induced spectroscopy (TRELIBS) is given. By means of a Nd:YAG laser and a double monochromator, the time resolved spectrum of the solid and molten aluminium alloys is detected using a photodiode array. According to the data obtained for the analytical performance, analysis in the molten phase can be done with sufficient accuracy and precision compared to the solid phase, without time loss for sample taking and preparation. Within the framework of the preliminary investigations, the fundamental analytical characteristics of the laser induced plasma are investigated (dependence of background (BG) and line/BG ratio on the atmosphere, state of the material, delay and gate time, the occurrence of self absorption and wavelength shift). The use of an argon atmosphere, relative line intensities (if possible, spectral lines of equal ionization state and excitation potentials should be near to each other) and an individual delay/gate time optimum can be recommended. |
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