Eddy current inspection technique

G - Physics – 01 – N

Patent

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G01N 27/90 (2006.01) G01B 7/06 (2006.01)

Patent

CA 2258623

Device (9) for inspecting an object (2) of electrically conductive material, comprising a non-static-signal transmitter for generating an electromagnetic field in the object (2), and a receiver (20, 21) for measuring the variations of the eddy current generated by the non-static electromagnetic field and for producing a signal representing the decay of the eddy current, wherein the non-static-signal transmitter comprises at least two laterally spaced-apart emitters (11, 12) for emitting an electromagnetic field, which emitters (11, 12) are, during normal operation, so driven that the resulting electromagnetic field in the central region (26), between the emitter; (11, 12), is intensified.

L'invention concerne un appareil (9) destiné à inspecter un objet (2) fabriqué dans une matière conductrice; l'appareil comprend un convertisseur de signaux non statiques permettant de générer un champ électromagnétique dans l'objet (2) ainsi qu'un récepteur (20, 21) permettant de mesurer les variations du courant de Foucault généré par le champ électromagnétique non statique et d'émettre un signal représentant l'amortissement du courant de Foucault, dans lequel le convertisseur de signaux non statiques comprend au moins deux émetteurs (11, 12) espacés latéralement destinés à l'émission d'un champ électromagnétique; ces émetteurs (11, 12) sont si excités pendant un fonctionnement normal, que le champ électromagnétique qui en résulte dans la zone centrale (26), entre les émetteurs (11, 12), est intensifié.

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