Eddy current hybrid probe

G - Physics – 01 – N

Patent

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Details

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

Patent

CA 2203799

The eddy current probe for non-destructive testing of a conductive elongated member comprises an oscillating magnetic field generator for producing a magnetic field directed towards a cross-sectional peripheral surface of the elongated member. The magnetic field generator includes a pair of coils arranged to be spaced apart along the elongated member to produce an enhanced combined magnetic field component perpendicular to the cross-sectional peripheral surface in a space between the coils and a reduced magnetic field component lengthwise along the elongated member. A ferromagnetic member is movably mounted for altering the magnetic field at points along the cross- sectional peripheral surface provided between the coils. A detecting and analyzing system measures an impedance of the coils as the generator is moved along the elongated member and as the field altering member is moved over the peripheral surface. An enhanced signal is obtained.

La sonde à courant de Foucault présentée, destinée au contrôle non destructif d'un élément allongé conducteur, comprend un générateur oscillant de champ magnétique qui produit un champ magnétique dirigé vers une surface périphérique transversale de l'élément allongé. Le générateur de champ magnétique comprend une paire de bobines placées, à une certaine distance l'une de l'autre, le long de l'élément allongé pour produire une composante de champ magnétique combinée augmentée, perpendiculaire à la surface périphérique transversale, dans l'espace compris entre les bobines, et une composante de champ magnétique réduite le long de l'élément allongé. Un élément ferromagnétique est monté mobile de façon que le champ magnétique puisse être modifié en des points situés le long de la surface périphérique transversale, entre les bobines. Un système de détection et d'analyse mesure l'impédance des bobines tandis que le générateur est déplacé le long de l'élément allongé et que l'élément modifiant le champ magnétique est déplacé sur la surface périphérique. Un signal renforcé est ainsi obtenu.

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