Optical proximity apparatus and method using light sources being

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

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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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Osada, Hideharu & Shimokohbe, Akira, "An Optical Non-Contacting Probe," 1984.
Kanade, Takco & Sommer M., Thomas, "An Optical Proximity Sensor for Measuring Surface Position and Orientation for Robot Manipulation," Robotics Institute Carnegie-Mellon University.
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Burns, Richard H. & Crabtree, Kenneth, "Heterodyne Laser Beam Position Sensor," Feb., 1978.

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