| 摘要 |
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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