Device for the continuous determination of a surface state index for a moving creped sheet
First Claim
1. A device for continuously determining a surface state index of a moving sheet which is creped in the form of undulations, the device comprising:
- a laser source which emits a beam toward a surface of the moving sheet;
a first astigmatic optical system positioned between said laser source and the moving sheet for concentrating said beam emitted by said laser source to form a luminous spot at an area of the moving sheet to be analyzed, said first optical system transforming a shape of said beam emitted by said laser source such that said luminous spot is adapted to the direction and dimension of average pitch of the undulations;
a second, convergent optical system disposed on the same side of the moving sheet as said first optical system for concentrating light which has been back-scattered by the moving sheet;
an optoelectronic cell for receiving said concentrated light from said second optical system at a sensitive surface thereof, said optoelectronic cell producing electrical signals responsive to an impacting position of said concentrated light on said sensitive surface; and
a processing system comprising means for determining the surface state index of the moving sheet using said electrical signals.
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Accused Products
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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Citations
9 Claims
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1. A device for continuously determining a surface state index of a moving sheet which is creped in the form of undulations, the device comprising:
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a laser source which emits a beam toward a surface of the moving sheet; a first astigmatic optical system positioned between said laser source and the moving sheet for concentrating said beam emitted by said laser source to form a luminous spot at an area of the moving sheet to be analyzed, said first optical system transforming a shape of said beam emitted by said laser source such that said luminous spot is adapted to the direction and dimension of average pitch of the undulations; a second, convergent optical system disposed on the same side of the moving sheet as said first optical system for concentrating light which has been back-scattered by the moving sheet; an optoelectronic cell for receiving said concentrated light from said second optical system at a sensitive surface thereof, said optoelectronic cell producing electrical signals responsive to an impacting position of said concentrated light on said sensitive surface; and a processing system comprising means for determining the surface state index of the moving sheet using said electrical signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification