G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/55 (2006.01) G01N 21/47 (2006.01) G01N 21/89 (2006.01) G01N 33/20 (2006.01) G01N 21/35 (2006.01)
Patent
CA 2494094
In order to measure the characteristics of the surface coating (1) of a moving metal strip such like an alliation degree of a coating containing zinc and iron, a product is exposed to the radiation (23) emitted by a radiation source (24) with a specified wavelength. The radiation is orthogonally oriented with respect to the product surface and the energy reflected therefrom is measured in an orthogonal direction with respect to said surface in such a way that reflectivity variations resulting from morphological characteristics of the surface are excluded. Said operations are carried out with the aid of commercial optical fibres whose ends (21, 31) are predeprived of the routine focusing optics thereof in such a way that they are moved as close as possible to each other and arranged in parallel position to each other.
Pour mesurer des caractéristiques d'un revêtement de surface (1) d'une bande métallique en défilement, telles que le niveau d'alliation d'un revêtement comportant du zinc et du fer, on expose le dit produit au rayonnement (23) d'une source radiative (24) de longueur d'onde prédéterminée, dirigé orthogonalement à la surface du produit et on mesure l'énergie réfléchie par la dite surface, également selon une direction orthogonale à la surface, de façon à s'affranchir des variations de réflectivité dues à des caractéristiques morphologiques de la surface et on effectue ces opérations à l'aide de fibres optiques du commerce préalablement dépouillées à leur extrémités libres (21, 31) de leur optique de focalisation habituelle de manière à pouvoir être rapprochées au maximum l'une de l'autre et disposées parallèlement entre-elles.
Bini Marco
Krauth Pierre-Jean
Smart & Biggar
Usinor
LandOfFree
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