Eddy-current testing probe

G - Physics – 01 – N

Patent

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G01N 27/90 (2006.01)

Patent

CA 2299373

An eddy-current flaw detector probe suitable for a nondestructive inspection comprises excitation coils (2, 2a, 2b) that generate eddy currents (12) in a test piece (10) by generating AC magnetic fields, and a pair of detection coils (1a, 1b) arranged in-phase and connected differentially. The pair of detection coils (1a, 1b) and the excitation coils (2, 2a, 2b) are arranged so that their centers may substantially coincide as viewed above the test piece (10). The difference in voltage due to the eddy currents (12) between the pair of detection coils (1a, 1b) is detected to find flaws in the test piece (10).

Cette sonde de détection de défauts par courants de Foucault, qui se révèle des plus utiles dans le cadre d'une inspection non destructrice, comporte des bobines d'excitation (2, 2a, 2b) générant des courants de Foucault (12) dans une éprouvette (10) par production de champs magnétiques à courant alternatif, ainsi que deux bobines de détection (1a, 1b) agencées en phase et connectées différentiellement. Ces bobines de détection (1a, 1b) ainsi que les bobines d'excitation (2, 2a, 2b) sont agencées de manière que leurs centres coïncident presque, comme vu de dessus. La différence de tension due aux courants de Foucault (12) entre les deux bobines de détection (1a, 1b) est détectée aux fins de la recherche de défauts dans ladite éprouvette (10).

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