Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-03-30
1994-11-29
Limanek, Robert P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250223R, 356375, G01B 1114
Patent
active
053692845
ABSTRACT:
A reflex proximity sensor includes a light emitting source which directs a beam by way of a beamsplitter toward a retroreflective surface, which reflects incident light back towards the source. A non-uniform (eccentric) convex lens is positioned in the beam path to produce a beam of light which is dispersed along a sensing axis, so that an eccentric cross-section beam is directed toward the retroreflective surface. The portion of the beam which reflects off the retroreflective surface passes back through the non-uniform convex lens and reflects off of the beamsplitter, and is directed to a photodetector. As an object traverses the beam in the direction of the sensing axis, the leading (or trailing) edge establishes a change in intensity level of the beam portion that reaches the detector. The output of the detector provides a signal representative of the edge position of the object.
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Hardy David B.
Limanek Robert P.
The Charles Stark Draper Laboratory Inc.
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