Apparatus for acoustic flaw detection in a moving strip

Details Apparatus for acoustic flaw detection in a moving strip Apparatus for acoustic flaw detection in a moving strip

G - Physics

01

N

G01N 29/04 (2006.01) G01N 29/27 (2006.01) G01N 29/28 (2006.01)

Patent

CA 2248437

An apparatus including at least one Lamb wave transducer (2) housed within a recording wheel (1) made of a flexible material, containing an acoustic coupling fluid and designed for rolling engagement with the surface of a product to be inspected. Said apparatus includes a roller (8) engaging the surface (10) of the product (11) to be inspected, and located upstream from the recording wheel (1) relative to the moving direction of said product, as well as an inlet (15) for controllably delivering an expendable coupling fluid with good surface wetting properties onto the surface (10) of the moving product. The apparatus is mounted on a movable carriage (5) that rolls along said surface (10) and is combined with supporting and guiding means (17-24) for controlling its position on the surface (10). The apparatus enables cross scanning for the ultrasonic inspection of a product (11) moving at high speed, e.g. a steel strip, during the production thereof.

L'appareil selon l'invention comprend au moins un traducteur à ondes de Lamb (2) logé à l'intérieur d'une roue palpeuse (1) en matière souple contenant un fluide de couplage acoustique est destinée à venir en contact roulant sur la surface du produit à inspecter. Il se caractérise en ce qu'il présente, d'une part, un galet (8) de contact avec la surface (10) du produit (11) à inspecter, placé en amont de la roue palpeuse (1) dans la direction de défilement dudit produit, et, d'autre part, en amont dudit galet, une arrivée (15) contrôlée de fluide couplant perdu sur la surface (10) du produit défilant ayant des propriétés de mouillage de ladite surface. Le tout constitue l'équipage d'un chariot mobile (5) destiné à rouler sur la surface (10) et associé à des moyens (17...24) de support, de guidage et de réglage de sa position sur la surface (10). L'invention permet, par un balayage travers, un sondage ultrasonore d'un produit (11) défilant à vitesse élevée, tel qu'une bande d'acier en cours d'élaboration.

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