Method and measuring arrangement for measuring paper surface
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United States of America Patent
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-
Jan 7, 2003
Grant Date -
Aug 22, 2002
app pub date -
Sep 14, 2001
filing date -
May 10, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a method and a measuring arrangement for determining gloss of paper or paperboard. The paper or paperboard surface is illuminated with collimated light substantially parallel with the normal of the paper or paperboard surface. An image is produced from the paper or paperboard 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 detector surface, each of the pixels imaging an area in the order of micrometers of the paper or paperboard surface. An aperture provided in front of the camera 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 detector surface.
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