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Analysis of molten material by laser-induced breakdown
spectroscopy (LIBS)
Sabsabi, Mohamad; Bouchard, Paul; Héon, René; Hamel, André;
Ajersch, Frank; Lucas, John M.
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Analysis of molten material by laser-induced breakdown
spectroscopy (LIBS)
Mohamad Sabsabi, Paul Bouchard, René Héon, André Hamel
National Research Council Canada - Industrial Materials Institute
75 de Mortagne Blvd, Boucherville, Québec, CANADA J4B 6Y4
Frank Ajersch
Ecole Polytechnique de Montréal
Montréal, Québec, CANADA H3C 3A7
John M. Lucas
5385 Durocher
Montréal, Québec, CANADA H2V 3X9
Abstract:
Charge compositions in many industrial processes are monitored by
periodic sampling followed by time-consuming sample preparation and laboratory
analysis. Virtually eliminating this delay through real-time in-situ Laser-induced
breakdown spectroscopy (LIBS) analysis has the potential to significantly
increase productivity and improve process control. However, LIBS analysis of
high-temperature molten metals in processing vessels still presents a number of
challenges. To have a reliable and accurate sensor the following requirements
should be met:
The vaporized volume should be truly representative of the liquid bulk.
Plasma conditions should be reproducible:
Perturbations from aerosols and ejected particles should be eliminated
The sensor should be sufficiently rugged to be used in plant.
Therefore, the determination of the composition of molten-phase samples by
LIBS in a furnace has been the subject of numerous studies in the laboratory and
several trials in industry.
In this paper, LIBS has been performed through a gas-fed lance producing
bubbles inside molten metal, to thereby analyze molten materials in a pilot
furnace and in a plant. Parameters affecting the LIBS spectra from the molten
material were investigated. The results indicated that the probe technique
overcame problems related to non-representative melt surfaces due to oxidation
or contamination. The precision obtained was in the order of 1-2 %. The LIBS
results will be compared with those obtained by conventional techniques.