Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1990-08-31
1993-08-17
Rosenberger, Richard A.
Optics: measuring and testing
By polarized light examination
With light attenuation
356374, 250237G, 33707, G01B 1114, H01J 314
Patent
active
052373916
ABSTRACT:
An optical sensor in which both analog and digital techniques are employed. The sensor comprises an encoder and a detector. The encoder includes a plurality of tracks extending along a sensing axis. Each track has a property that varies along the sensing axis, such that the property can have one of three or more distinguishable levels. The detector detects the levels of the tracks at a position along the sensing axis, and produces corresponding output signals. The levels vary in a manner such that the output signals encode the position of the encoder with respect to the detector. The levels may vary in steps or continuously. For stepwise variable tracks, preferably only one track changes its level at any given position, and all changes in level occur in single steps. Both optical and electrical implementations are described.
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Pham Hoa
Rosenberger Richard A.
The Boeing Company
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