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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Печать: 1093-3611
ISSN Онлайн: 1940-4360

Выпуски:
Том 24, 2020 Том 23, 2019 Том 22, 2018 Том 21, 2017 Том 20, 2016 Том 19, 2015 Том 18, 2014 Том 17, 2013 Том 16, 2012 Том 15, 2011 Том 14, 2010 Том 13, 2009 Том 12, 2008 Том 11, 2007 Том 10, 2006 Том 9, 2005 Том 8, 2004 Том 7, 2003 Том 6, 2002 Том 5, 2001 Том 4, 2000 Том 3, 1999 Том 2, 1998 Том 1, 1997

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v8.i4.40
pages 535-547

DIAGNOSTICS OF LIGHTING ARC PLASMAS BY NON-LTE EMISSION SPECTROSCOPY

Dimitrios Karabourniotis
Department of Physics, Institute of Plasma Physics, University of Crete, 71003 Heraklion Crete, Greece
E. Drakakis
TEI of Crete, Department of Electrical Enginneering, Greece

Краткое описание

Plasma diagnostics of arc light sources is of immediate interest in developing a better understanding of the atomic processes that govern their operation. Due to new application ranges, e.g., interior lighting and automobile headlights, these devices, especially the metal-halide lamps, are of increasing practical importance. Mass movement and energy transfer within the arc volume are factors causing deviation of the plasma state from thermodynamic equilibrium. Diagnostics methods that are free from equilibrium assumptions are, therefore, of primary importance. An emission spectroscopy diagnostic method using self-reversed lines was developed. This method is relatively easy to apply, does not require complex technology, and it is free from equilibrium assumptions. Application examples in mercury and mercury-metal halide arc lamps are given and discussed. The obtained results show substantial differences between excitation, electron and LTE temperatures indicating severe departures from excitation equilibrium. These departures depend on the presence of the easily ionizable metal of the metal halide. Indications of strong overpopulation of the resonance and metastable thallium states with respect to the ground state are obtained in an arc lamp containing mercury and thallium iodide.


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