Method of measuring the cleanness of steel strip
US8483474B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 2009 |
| Grant date | Jul 9, 2013 |
| Priority date | — |
| Expiry date | May 18, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T7/0004
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.