Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reexamination Certificate
2004-10-29
2009-02-10
Aurora, Reena (Department: 2862)
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
C324S238000, C324S239000, C324S240000
Reexamination Certificate
active
07489129
ABSTRACT:
The invention relates to a method of detecting surface defects on a continuously-cast crude metallic product, such as a steel slab (4). According to the invention, a sensor (10) is used to detect surface defects by means of eddy currents, said sensor consisting of a matrix comprising at least two rows (22, 24) of at least three adjoining measuring cells (21) which can be controlled by a multiplexing control unit (12). Moreover, each cell can generate eddy currents at the surface of the slab and, alternately, detect eddy currents in said surface. The inventive method comprises a step consisting in controlling a first transmitting cell and a second receiving cell from the same row, but which are separated from one another by at least one inactive cell.
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Meilland Philip
Midroit Fabien
Turon Jean-Michel
ArcelorMittal France
Aurora Reena
Sughrue & Mion, PLLC
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