Method and measuring arrangement for measuring paper surface

Details Method and measuring arrangement for measuring paper surface Method and measuring arrangement for measuring paper surface

G - Physics

01

B

G01B 11/30 (2006.01) G01N 21/57 (2006.01)

Patent

CA 2373674

The invention relates to a method and a measuring arrangement for determining roughness of paper of paperboard. The paper or paperboard (11) surface is illuminated with collimated light substantially parallel with the normal of the paper or paperboard (11) surface. An image is produced from the paper or paperboard (11) surface by means of reflected optical radiation. The reflected optical radiation is used for producing an image of the paper or paperboard surface onto the pixels of the camera's (22) detector surface, each of the pixels imaging an area in the order of micrometers of the paper or paperboard surface. An aperture (20, 30) provided in front of the camera (22) is used for adjusting the depth of focus of the image, which affects the measurement of roughness. Roughness of paper or paperboard is measured on the basis of the intensity of the pixels on the camera's (22) detector surface.

L'invention concerne un procédé et un dispositif de mesure permettant de déterminer la rugosité de papier ou de carton. On éclaire la surface de papier ou de carton (11) au moyen d'une lumière collimatée de manière sensiblement parallèle à la normale de la surface de papier ou de carton (11). On produit une image à partir de ladite surface au moyen d'un rayonnement optique réfléchi. On utilise ensuite ce rayonnement pour générer une image de la surface de papier ou de carton (11) sur les pixels de la surface de détection d'une caméra (22), chaque pixel formant une image d'une zone de l'ordre des micromètres de la surface de papier ou de carton (11). On utilise une ouverture (20, 30), formée devant la caméra (22), pour régler la profondeur de foyer de l'image, ce qui modifie la mesure de la rugosité. On mesure enfin la rugosité du papier ou du carton sur la base de l'intensité des pixels de la surface de détection de la caméra (22).

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