Method and device for determining fibre orientation in a...

Details Method and device for determining fibre orientation in a... Method and device for determining fibre orientation in a...

G - Physics

01

N

G01N 21/86 (2006.01) G01N 21/55 (2006.01) G01N 21/89 (2006.01) G01N 33/34 (2006.01)

Patent

CA 2334878

The invention relates to a method and device for determining fiber orientation in a paper sample. The surface of the sample (1) is illuminated from an oblique angle (11) by means of more than one light source (2, 3). The illumination is rotated on the surface of the sample by electronically switching the light sources on and off in turn by means of a switch (12). The intensity of the light reflected from the surface of the sample is measured using at least one sensor (5) and, based on the measured light intensity and momentary direction of illumination, the fiber orientation in the sample is determined by means of a computing device (13).

L'invention concerne un procédé et un dispositif de détermination de l'orientation des fibres dans un échantillon de papier. La surface de l'échantillon (1) est illuminée à partir d'un angle oblique (11) à l'aide de plus d'une source de lumière (2, 3). L'illumination effectue une rotation sur la surface de l'échantillon par commutation électronique des sources de lumière tour à tour à l'état de marche et d'arrêt, à l'aide d'un commutateur (12). L'intensité de la lumière réfléchie par la surface de l'échantillon est mesurée à l'aide d'au moins un capteur (5) et, sur la base de l'intensité de la lumière mesurée ainsi que du sens d'illumination momentané, l'orientation des fibres dans l'échantillon est déterminée par un dispositif de calcul (13).

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