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

N

G01N 21/57 (2006.01) G01B 11/30 (2006.01) G01N 21/55 (2006.01) G01N 21/84 (2006.01) G01N 33/34 (2006.01)

Patent

CA 2373682

The invention relates to a method and a measuring arrangement for determining gloss of paper or 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 incidence angles of the reflected radiation, which affects the measurement of gloss. Gloss of paper or paperboard is measured on the basis of the intensity of the pixels on the camera's (22) detector surface.

La présente invention concerne un procédé et un agencement de mesure permettant de déterminer la brillance du papier ou du carton. On éclaire le papier ou le carton (11) d'une lumière collimatée sensiblement parallèle à la normale de la surface du papier ou du carton (11). On produit une image à partir de la surface du papier ou du carton (11) au moyen d'un rayonnement optique réfléchi. On utilise le rayonnement optique réfléchi en vue de produire une image de la surface du papier ou du carton (11) sur les pixels de la surface de détection de la caméra (22), chacun des pixels effectuant une prise d'image d'une zone de l'ordre micrométrique de la surface du papier ou du carton. On utilise une ouverture (20, 30) prévue à l'avant de la caméra (22) pour ajuster les angles d'incidence du rayonnement réfléchi, effectuant ainsi la mesure de brillance. On mesure la brillance du papier ou du carton à partir de l'intensité de pixels sur la surface de détection de la caméra (22).

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