Differential transmit-receive eddy current probe...

G - Physics – 01 – N

Patent

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

Patent

CA 2076205

An eddy current probe for insertion into a tube to be inspected includes a transmitter coil and a pair of sensing coils. The pair of sensing coils have opposite polarity relative to one another and are series connected to provide a differential output. The pair of sensing coils and the transmitter coil are disposed on the surface of the probe. The pair of sensing coils being equally spaced from the transmitter coil and separate from each longitudinally on the probe. Each sensing coil in the pair of sensing coils is thereby angularly displaced from a plane transverse to the probe as measured from the transmitter coil with which a multi-coil unit is formed. Bracelets of coils are formed from plural multi-coil units aligned around the probe to improve sensitivity of the probe. Additional bracelets of coils may be added to the probe, offset rotationally, to improve coverage of the tube. The additional bracelets are longitudinally spaced to prevent interference between transmitter coils of one bracelet and receiver coils of the other bracelet.

Cette invention concerne une sonde à courants de Foucault servant à l'inspection intérieure d'un tube et comprenant une bobine émettrice et une paire de bobines de détection. Les deux bobines de détection sont de polarités opposées et sont connectées en série pour fournir une sortie différentielle. Toutes les bobines sont disposées à la surface de la sonde. Les bobines de détection se trouvent à égale distance de la bobine émettrice et sont séparées longitudinalement l'une de l'autre. Ainsi, chaque bobine de détection est décalée d'un angle donné par rapport à un plan transversal de la sonde passant par la bobine émettrice formant l'ensemble multi-bobines. Pour accroître la sensibilité de la sonde, plusieurs ensembles multi-bobines sont disposés sur le pourtour de celle-ci de façon à former des bracelets. D'autres bracelets décalés circonférentiellement peuvent aussi être ajoutés à la sonde pour étendre la surface auscultée du tube. Ces autres bracelets sont décalés longitudinalement pour éviter que les bobines émettrices d'un bracelet parasitent les bobines de détection du bracelet adjacent.

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