| 摘要 |
: The invention relates to a system for determining fiber orientation in a stationary or moving web of fibers. It comprises a light source, means for focusing a small light spot onto the surface of the web resulting in an ellipse-shaped spot on the opposite surface of said web, an array of light-sensitive elements positioned on the other side of the web, parallel and at a predetermined distance therefrom, means for focusing the elliptical light-spot onto said array, and means for evaluating the said image on said array as to size, orientation and aspect ratio of the ellipse. The invention further provides a method for the determination of fiber orientation in fiber webs, which comprises focusing a spot of light onto the surface of such web, focusing the image formed to the other side of the web, which image is generally elliptical, onto an array of light-sensitive elements and evaluating the important parameters of said elliptical light spot.
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