Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-05-24
1989-12-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250201, 356 1, G01N 2186
Patent
active
048884901
ABSTRACT:
Optical proximity apparatus, and a related method, for monitoring the proximity and angular orientation of a surface and for maintaining that surface in a desired relative position. The apparatus directs two coplanar beams of modulated light onto the surface such that they converge toward a central axis and reach the axis at the point where it intersects the surface's desired position. Two photodetectors receive light scattered from the surface along two detection axes, in the plane of the two modulated beams and on opposite sides of, and equidistant from, the central axis. The relative intensities of the two separate modulated beams received by the two photodetectors can be determined and suitably analyzed to determine the surface's actual proximity and angular orientation relative to its desired position.
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Bass Michael
Copley Stephen M.
Allen Stephone B.
Nelms David C.
University of Southern California
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