Photoelectric color sensor

Details Photoelectric color sensor Photoelectric color sensor

1991-03-25

1992-09-22

Evans, F. L.

Optics: measuring and testing

By shade or color

250226, 356406, 356425, 356446, G01J 350

Patent

active

051501740

ABSTRACT:
At least one pair of light emitting diodes (LEDs) is disposed to direct a beam of common discrete chromaticity each to a separate target area located at different distances from a centrally disposed photodetector. Upon pulsing of the diodes at a common time, the photodetector receives the sum of the diffused light reflected from a target disposed at a location between the separate target areas to substantially reduce the affects of variation in distance of a target from the photodetector. The photodetector output is corrected for the effects on the LEDs of variations in ambient temperature.

REFERENCES:
patent: 4568191 (1986-02-01), Barry
patent: 4755058 (1988-07-01), Shaffer
patent: 4823169 (1989-04-01), Ogura
patent: 4917500 (1990-04-01), Lugos
patent: 4986665 (1991-01-01), Yamanishi et al.

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