Device for the continuous determination of a surface state index for a moving creped sheet
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United States of America Patent
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Dec 18, 1990
Grant Date -
N/A
app pub date -
Apr 19, 1989
filing date -
Sep 17, 1987
priority date (Note) -
Expired
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Abstract
A device for the continuous determination of a surface state index for a ing sheet, creped in the form of undulations, comprising a light source, a first optical system, a cell intended to receive the back-scattered beam and a system for processing the beam, wherein: the light source is a laser source; the first optical system is an astigmatic system, intended to adapt the size of the laser beam at the point where it meets the sheet to the average pitch of the said undulations in the moving creped sheet; the cell is an optoelectronic cell whose sensitive surface receives at least part of the back-scattered light, concentrated by a second convergent optical system; and the processing system comprises a means for determining a surface state index for the sheet from the electrical signals.
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