Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1978-12-21
1981-01-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, G01D 534
Patent
active
042477697
ABSTRACT:
An optical apparatus for measuring angular or linear displacements. The apparatus comprises a single planar element having on its surface a pattern of sectors characterized by alternating optical transmission coefficients. An optical system superimposes a real image of a portion of the pattern upon that portion of the pattern itself. This image moves in the direction opposite to the planar element, so that as the element moves, the interaction of the sectors of the image with the sectors themselves creates alternating light and dark areas as a result of shuttering or interference effects. A light sensor monitors these light and dark areas thereby providing a measure of the displacement of the planar element.
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Hostetter Darwin R.
Nelms David C.
The Charles Stark Draper Laboratory Inc.
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