Optical system for analysing the surface of a fibrous web

Details Optical system for analysing the surface of a fibrous web Optical system for analysing the surface of a fibrous web

G - Physics

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G01N 21/17 (2006.01) G01B 11/30 (2006.01) G01N 21/55 (2006.01) G01N 33/34 (2006.01) G01N 33/36 (2006.01)

Patent

CA 1192417

TITLE OPTICAL SYSTEM FOR ANALYSING THE SURFACE OF A FIBROUS WEB INVENTOR Paolo G. Cielo ABSTRACT OF THE DISCLOSURE The apparatus for analysing the surface of a fibrous web, such as a paper or a textile, includes a prism structure in which one surface is placed in contact with the fibrous web under a predetermined pres- sure. A collimated beam of light is directed into the prism on the contact surface. The light reflected from the contact surface through the prism is directed to a detector. The detector senses the light reflected by the contact surface as well as the light diffracted at the contact surface to indicate the surface condition of the fibrous web.

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