Color detection device

Details Color detection device Color detection device

1976-12-01

1978-10-17

McGraw, Vincent P.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356195, 356186, G01J 346, G01J 348

Patent

active

041205910

ABSTRACT:
Color detection apparatus wherein only light that has been diffuse-reflected, and has not been mirror-reflected, from the object whose color is to be detected is processed. Light from a source passes through a first polarizer before the light is incident on the object whose color is to be detected. Light reflected from this target object passes through a second polarizer which blocks all mirror-reflected light while permitting a portion of the diffuse-reflected light to pass. After passing through the second polarizer a portion of the light is directed onto a color filter after which the intensity of the transmitted light is detected. The intensity of the portion of light not applied to the color filter is also detected. The ratio of the output of the two detectors is a function of the color of the reflected light. The principal axis of the light incident on the target object is coincident with the principal axis of the reflected light that is to be processed, thus eliminating the need to accurately position the target object.

REFERENCES:
patent: RE29031 (1976-11-01), Irving
patent: 3306156 (1967-02-01), Glasser
patent: 3443072 (1969-05-01), Mori

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