Appeal No. 1997-1698
Application No. 08/348,447
supported within the enclosure at a point along the optical axis
between the window and the detector to block the beam when
reflected by a substantially smooth surface. Lens L is supported
within the enclosure along the optical axis at a point between the
window and the blocking element to gather light scattered off-axis
when the surface is roughened and focus the gathered light onto
the detector. Electrical circuitry C is disposed within the
enclosure and includes a comparator operative to compare an
adjustable threshold signal to the output of the detector and
deliver a signal to change the state of the indicator, meter M or
lamps L, if the output of the detector exceeds the threshold
signal.
The Prior Art
Frohardt discloses optical apparatus comprising a gloss
sensor having a source of light 1 for emitting a light beam 2
toward a surface 4 to be characterized, an optical blocking
element 10 positioned to attenuate the beam reflected by the
surface, and a detector 5 for detecting light scattered by the
surface. A circuit 14 receives the signal from the light
detector, evaluates the signal by comparing the intensity of the
6
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