Method of measuring the cleanness of steel strip
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United States of America Patent
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Jul 9, 2013
Grant Date -
Mar 3, 2011
app pub date -
Mar 12, 2009
filing date -
May 14, 2008
priority date (Note) -
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Abstract
The present invention relates to an automated in-line method for measuring the surface cleanness of a continuously running metal sheet or strip, characterized by the following steps: a beam of radiation or a particle beam or a spark is focused onto the surface of the running strip, the transmitted power and the focal diameter being chosen so as to obtain a power density sufficient to create a plasma or hot spot which locally etches the metal in the form of a central zone surrounded by a peripheral oxidation ring; the characteristics of a zone encompassing said oxidized ring and possibly said central zone are analyzed by means of an optical image acquisition device and image processing; and an objective value indicative of the surface cleanness is deduced therefrom.
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