Apparatus for measuring the state of formation of a sheet of paper
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United States of America Patent
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Nov 17, 1987
Grant Date -
N/A
app pub date -
Jul 12, 1985
filing date -
Jul 17, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to an apparatus for continuously measuring the state of formation of a sheet of paper which comprises: --means for moving a sheet of paper at a predetermined speed; --a light source directing a laser beam through said sheet; --a means for picking up the laser light transmitted, then for converting it into an electrical signal; --electronic processing means for separating this electrical signal into two components; --means for calculating from these components the index I representative of the state of formation; --a means for displaying the value of this index I; wherein the laser beam is polarized, and the apparatus further comprises, between the sheet and the means for picking up the laser light transmitted, a polarizer of which the axis of polarization is perpendicular to the axis of polarization of the laser beam transmitted.
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