Non destructive control device for the ultrasound...

G - Physics – 01 – N

Patent

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G01N 29/22 (2006.01) G01N 29/265 (2006.01) G21C 17/017 (2006.01)

Patent

CA 2228675

The support of the transducer (5) comprises an active surface on which piezoelectric elements (6) are arranged juxtaposed in one direction at least of the active surface of the transducer. A mirror (7) having a surface (7') reflecting the ultrasounds is directed towards the active surface of the transducer (5). The reflecting surface (7') is oriented so as to transmit to successive zones of the surface of the elongate part (2) the ultrasounds coming from each of the piezoelectric elements (6), and to send back the ultrasounds reflected by the surface of part (2) towards the piezoelectric elements (6). The transducer (5) is connected to the mirror (7) so that the distance between the transducer and mirror can be adjusted in an axial direction. The invention applies particularly to the control of tubes from the outside or the inside and more particularly to the control of steam generator tubes of nuclear reactors, or sheath-tubes of fuel assemblies.

Le support du transducteur (5) comporte une surface active sur laquelle des éléments piézoélectriques (6) sont disposés de manière juxtaposée dans une direction au moins de la surface active du transducteur. Un miroir (7) comportant une surface (7') réfléchissant les ultrasons est dirigé vers la surface active du transducteur (5). La surface réfléchissante (7') est orientée de manière à transmettre à des zones successives de la surface de la pièce allongée (2), les ultrasons provenant de chacun des éléments piézoélectriques (6) et à renvoyer les ultrasons réfléchis par la surface de la pièce (2) sur les éléments piézoélectriques (6). Le transducteur (5) est relié au miroir (7) de telle sorte qu'on puisse régler la distance entre le transducteur et le miroir suivant la direction axiale. L'invention s'applique en particulier au contrôle des tubes par l'extérieur ou par l'intérieur et plus particulièrement au contrôle des tubes de générateur de vapeur des réacteurs nucléaires, ou de tubes-gaines d'assemblage de combustible.

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