Appeal No. 1997-1698
Application No. 08/348,447
surface 130 to be characterized as smooth or rough. Light source
110 is disposed within the enclosure to project a beam of light
through the window and onto the surface. The beam is reflected by
the surface along an optical axis 122. A light-sensitive detector
D is disposed along the optical axis within the enclosure to
receive light scattered by the surface. The detector outputs an
electrical signal representative of the light received. Optical
blocking element B is
5
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Last modified: November 3, 2007