Apparatus and method for analyzing parameters of a fibrous...

Details Apparatus and method for analyzing parameters of a fibrous... Apparatus and method for analyzing parameters of a fibrous...

G - Physics

01

N

73/53

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

Patent

CA 1250761

ABSTRACT OF THE INVENTION A radiation sensor provides on-line measurement of web MD/CD fiber orientation ratio, formation indexes of multiple spatial frequencies, and optical density as it relates to basis weight. A light source illuminates one side of a substrate to be measured. The radiation passing through the substrate is detected by a pair of detectors having fields of view along narrow strips which are perpendicular to each other. The combined field of view is scanned in a repetitive pattern traversing an area on the substrate to be analyzed. The detector outputs are processed to provide fiber orientation ratio, formation, and basis weight measurements.

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