Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1983-10-24
1986-07-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237R, 350276SL, G01J 350, H01J 516
Patent
active
046032517
ABSTRACT:
Device for determining the reflective properties of objects in discrete spectral zones. The device has a housing in which there is disposed a diaphragm perpendicularly to the optical axis of the device and photosensors sensitive to light in a narrow spectral range that are connected with electronic amplifiers. The opening of the diaphragm coincides with the basic aperture of vision. Between the diaphragm and the object there are disposed supplementary diaphragms with openings coinciding with the basic aperture of vision. Each supplementary diaphragm lies in a plane determined by the intersection point of the parasitic aperture of vision of the diaphragm preceding it on the side of the photosensors and the housing. The device may be use to advantage in color discriminating systems, for example, the sorting of tobacco leaves according to their color.
REFERENCES:
patent: 2670656 (1954-03-01), Braymer
patent: 3016798 (1962-01-01), Lawrence
patent: 4150287 (1979-04-01), Perkins
patent: 4217026 (1980-08-01), Radovich
Hristozov Vladislav N.
Marchev Zdravko B.
Markov Spas N.
Ribarov Hristo M.
Institute po Technicheska Kibernetika i Robotika
Madoo Lark W.
Nelms David C.
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