Determination of gloss quality

G - Physics – 01 – N

Patent

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G01N 21/57 (2006.01) G01N 33/34 (2006.01)

Patent

CA 2247288

A method and apparatus for obtaining a basis on which the gloss quality of a sample surface of a sample, such as a paper sheet, can be determined by illuminating the sample surface and registering the intensity of the reflected light. With the intention of enabling several different types of gloss variation investigations to be made on a sample surface essentially in accordance with known principles of gloss facet approximation, it is proposed, among other things, that the sample surface (80) is exposed in an image registering area (44) by controlled rotary movement of the sample surface through the image registering area or by controlled rotary movement of the image registering area over the sample surface, wherein the intensity of the light reflected from a plurality of spatially well defined part-surfaces of the sample surface is registered several times during this rotary movement while, at the same time, determining the positions of the part-surfaces in the image registering area (44), and in turn the viewing angle, so as to establish what we here define as an image volume which is representative of the registered light intensity as a function of the position of the part-surfaces within the sample surface and of the respective viewing angle.

Procédé et dispositif d'obtention d'une base sur laquelle la qualité de brillance d'une surface échantillon, telle qu'une feuille de papier, peut être déterminée par éclairage de ladite surface puis enregistrement de l'intensité de la lumière réfléchie. Pour permettre différents types d'analyse des variations de brillance sur une surface échantillon en respectant essentiellement les principes connus de l'approximation de facettes de brillance, il est suggéré d'exposer la surface échantillon (80) dans une zone photo-sensible (44) par un mouvement rotatif commandé de la surface de l'échantillon dans la zone photo-sensible ou par mouvement rotatif commandé de la zone photo-sensible au dessus de la surface de l'échantillon, dans des conditions telles que l'intensité de la lumière réfléchie à partir d'une série de surfaces partielles bien définies dans l'espace soit enregistrée plusieurs fois au cours de ce mouvement rotatif tandis que, simultanément, sont déterminées les positions des surfaces partielles dans la zone photo-sensible (44) ainsi que l'angle de vision, afin d'établir ce qu'il est convenu d'appeler un volume d'image, grandeur représentative de l'intensité de l'image reçue en fonction de la position des surfaces partielles comprises dans la surface de l'échantillon et de l'angle de vue correspondant.

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