Application of LIBS to the in-line process control of liquid high-alloy steel under pressure View Full Text


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Article Info

DATE

2006-05

AUTHORS

Gerhard Hubmer, Reinhard Kitzberger, Karl Mörwald

ABSTRACT

A process optimization and control system called VAI-CON Chem has been developed that uses laser-induced breakdown spectroscopy (LIBS) to quasi-continuously chemically analyze liquid high-alloy steel under pressure. The beam from a Nd:YAG laser, located on safe ground and operating at its fundamental wavelength, is guided by a mirror system to a process tuyere below bath level. Passing through the approximately 1.5 m long tuyere, the beam is then focused onto the steel bath. Light emitted from the induced plasma passes back through the tuyere, which is coupled to a fiber optic cable that carries the information over a distance of approximately 10 m back to an Echelle spectrometer located beside the laser. Calibrations were performed using the complete system, located in a laboratory, during system testing. An induction furnace was used to simulate the AOD converter, wherein the samples were molten and superheated to a temperature of approximately 1600 degrees C and kept at a pressure of approximately 1.7 bar under an argon atmosphere. Twelve different high alloyed reference samples taken from normal AOD production with Fe concentrations of >48 wt.% and non-Fe element concentrations of up to 25 wt.% were available for calibration. The mean residual deviations (defined as the square root of the variance of the concentration ratios determined by LIBS and the reference element concentration ratios) obtained were close to those reported for other comparable high-alloy samples that were investigated at room temperature under normal atmospheric pressure. More... »

PAGES

219-224

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00216-006-0321-9

DOI

http://dx.doi.org/10.1007/s00216-006-0321-9

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1032019961

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/16550425


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