Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-09-01
1991-11-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356446, G01N 2188
Patent
active
050668650
ABSTRACT:
A single sided reflectance sensor having an optical arrangement which permits accurate measurements of select physical properties of a moving sheet. The sensor comprises a protective enclosure, positioned adjacent to a sheet surface, containing an electromagnetic radiation source disposed to project an incident beam onto the sheet surface, a reflectance sensing means for sensing the intensity of the reflected portion of the incident beam, and a planar convex lens, located between the source and the sheet. The shape and orientation of the lens source and the sheet. The shape and cross-direction and/or render the sensor substantially insensitive to sheet flutter.
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Allen S. B.
Measurex Corporation
Nelms David C.
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