| 摘要 |
b) Installation, characterised in that the dispersion flux measurement head (56) comprises at least two Hall probes forming a battery of Hall probes arranged along a line parallel and/or perpendicular to the magnetic fields created by the magnet, the dispersion flux measurement head having at least two feet bearing at a distance from each other on the article, these feet being provided between the Hall probes, and in that the dispersion flux measurement head (56) is fitted with a protective plate which covers the face of the Hall probes on the article side. <IMAGE>
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