Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-01-27
1987-05-05
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356225, H01J 314
Patent
active
046635246
ABSTRACT:
A two-dimensional knife edge mask comprised of an array of spaced periodic rectangular opaque regions (e.g., a chrome grating pattern layer deposited on one surface of a slide) separated by transparent different given spacing stripes between adjacent rectangular regions in each of the two orthogonal dimensions thereof, is linearly moved at a fixed velocity across an incident light spot, the direction of movement being oblique to the orthogonal dimensions of the rectangular regions and the distance of movement being sufficient to traverse at least one entire spacing strips in each of the two orthogonal dimensions. A photocell (which may be secured to the other side of the slide) senses the occulted light.
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Gale Michael T.
Meier Heinrich
Nelms David C.
RCA Corporation
Seligsohn George J.
Tripoli Joseph S.
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