Eddy current sensor and tube testing tool having at least...

G - Physics – 01 – N

Patent

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Details

G01N 27/90 (2006.01) G21C 17/017 (2006.01)

Patent

CA 2214773

For the nondestructive testing of an electrically conductive part (T), an eddy current sensor (22a) is proposed comprising two transmitter windings (26) and one receiver winding (28). These three windings are arranged symmetrically with respect to a reference plane (P1) oriented perpendicular to the surface of the part (T). The receiver winding (28) is placed between the active portions (26a) of the emitter windings (26) and perpendicular to the plane (P1), whereas the transmitter windings (26) are substantially parallelto said plane. The coils and connections of the transmitter windings are such that the receiver winding is not traversed by any current in the absence of a fault. A tool for testing a tube (T), such as a steam generator tube, has two sensors oriented at right angles to one another.

Pour effectuer le contrôle non destructif d'une pièce (T) électriquement conductrice, il est proposé un capteur (22a) à courants de Foucault comprenant deux enroulements émetteurs (26) et un enroulement récepteur (28). Ces trois enroulements sont disposés symétriquement par rapport à un plan de référence (P1) prévu pour être orienté perpendiculairement à la surface de la pièce (T). L'enroulement récepteur (28) est placé entre les parties actives (26a) des enroulements émetteurs (26), perpendiculairement au plan (P1) alors que les enroulements émetteurs (26) sont sensiblement parallèles à ce plan. Les bobinages et les connexions des enroulements émetteurs sont tels que l'enroulement récepteur n'est parcouru par aucun courant, en l'absence de défaut. Un outillage de contrôle d'un tube (T) tel qu'un tube de générateur de vapeur comprend deux capteurs orientés à angle droit l'un par rapport à l'autre.

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