Up to now, no model or contactless sensor has been available for
on-line control of the effectiveness of the flow of the stirring gas in
the ladle in secondary metallurgy. A new method, based on the use
of conoscopic holography, has been developed by Arcelor-Aceralia.
It measures on line the vibrations in the walls of the ladle and relates
them to the argon flow rate. This method is useful for determining
the real state of the stirring process, obtaining an accurate index of
the process of melt agitation that influences the composition homogeneity