Method and device for magnetically testing products with a...

Details Method and device for magnetically testing products with a... Method and device for magnetically testing products with a...

G - Physics

01

N

G01N 27/82 (2006.01) F16L 55/18 (2006.01)

Patent

CA 2226631

Products with a wall (1) comprising at least one layer (11) of ferromagnetic material may be tested by magnetizing the layer using magnetizing means (30) to generate therein a remanent magnetization (H) parallel to the wall surface, then moving magnetic field sensors (2) along the wall and measuring, in the presence of the remanent magnetization (H) alone, the magnetic field adjacent to the product surface, whereby changes in the field measured along the wall indicate defects (22) in the layer of magnetic material. The method is particularly suitable for testing elongated products in which the layer to be tested is not on the surface. Specifically, the method is suitable for testing pipelines or tubes for transporting petroleum.

Pour contrôler des produits dont la paroi (1) comporte au moins une couche (11) en matériau ferromagnétique, on magnétise ladite couche par des moyens de magnétisation (30) pour y créer une aimantation rémanente (H) orientée parallèlement à la surface de ladite paroi, puis on déplace le long de la paroi des détecteurs (2) de champ magnétique et on mesure, en la seule présence de ladite aimantation rémanente, le champ magnétique au voisinage de la surface du produit, des variations du champ mesuré le long de la paroi étant significatives de défauts (22) affectant ladite couche en matériau magnétique. L'invention s'applique notamment au contrôle de produits de grande longueur, dans lesquels la couche à contrôler n'est pas affleurante, et plus particulièrement au contrôle de canalisations ou flexibles de transport de pétrole.

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