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Reduced LIBS plasma model via thermodynamics
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Paper Abstract

A standard spectroscopic sensor technique for classification of materials is Laser Induced Breakdown Spectroscopy (LIBS). Though LIBS, as an Atomic Emission Spectroscopy (AES) technique, is generally separated from signal processing based classification techniques, they strongly interact in the design of sensor systems. Strict disciplinary separation results in approaches that inadequately address the mass, power consumption and other portability parameters of the ultimate sensor. Modifications in the sensor design approach and of the classification processing techniques reduce redundancies in the system, resulting in more compact overall systems. An engineering thermodynamic approach to the plasma description, as part of a predictor-corrector style classification loop, is used to reduce system requirements for material classification. This paper presents results for the compaction of the model system. In this work, a nontraditional approach is made to reduce the modeling system to a configuration compatible with the incorporation of the model onto a compact DSP structure. Calculation of partition function tables allows heuristic adjustments to a thermodynamic description of the LIBS plasma. Once the plasma environment is established, rate equation descriptions can establish detailed balance and predict the emission properties of the sample. The resulting model must be compatible with compact, low power, computation schemes, such as multi-core DSPs as part of a predictor-corrector classifier.

Paper Details

Date Published: 4 May 2012
PDF: 8 pages
Proc. SPIE 8358, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII, 835812 (4 May 2012); doi: 10.1117/12.919167
Show Author Affiliations
Steven T. Griffin, The Univ. of Memphis (United States)
Brandon Dent, The Univ. of Memphis (United States)

Published in SPIE Proceedings Vol. 8358:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII
Augustus Way Fountain III, Editor(s)

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