Method and apparatus for determining the fiber orientation...

Details Method and apparatus for determining the fiber orientation... Method and apparatus for determining the fiber orientation...

G - Physics

01

N

G01N 21/55 (2006.01) G01N 21/21 (2006.01) G01N 21/86 (2006.01) G01N 33/34 (2006.01)

Patent

CA 2116265

Disclosed are a method and apparatus for rapidly and accurately determining fiber orientation of stationary or moving paper in a paper machine useful for grade study and quality control of the paper. A projector projects an unpolarized light beam perpendicularly to a surface of the paper to be tested, then a light beam reflected by the paper surface is caught by eight or more light receivers distributed on a circumference of a circle defined, on the incident side of the unpolarized light beam, in a plane extending in parallel to the paper surface around a point at which the above-mentioned parallel plane intersects an axis of the incident light beam, and a light information signals output from these light receiving means are subjected to a predetermined arithmetic processing to obtain the fiber orientation characteristics such as fiber orientation index value and fiber orientation angle.

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