Device and method for determining the color value of a light

Details Device and method for determining the color value of a light Device and method for determining the color value of a light

1995-05-18

1997-02-18

Evans, F. L.

Optics: measuring and testing

By shade or color

Tristimulus examination

356419, 250226, G01J 351

Patent

active

056045948

ABSTRACT:
A device for determining the color value of light includes a linear graded interference filter, which has only one expansion direction through which the light is incident on a number of photodetectors. The photodetectors are arranged adjacent to one another in the expansion direction of the graded interference filter and are used to supply measuring signals, on the basis of which the color value is calculated. Focusing optics arranged in front of the graded interference filter are used to focus the light onto the photodetectors. The light is fed via a plurality of optical guides, whose light exit ends are arranged closely adjacent to one another along one or more rows extending in the expansion direction of the graded interference filter. The focusing optics contain a cylindrical lens extending in the expansion direction. Advantageously, the photodetectors are PIN photodiodes and the optical waveguides are optical fibers. The number of detectors and their position along the expansion direction determine the accuracy of the polygonal approximation of the chromaticity diagram for natural colors, and thus providing more accurate color determination.

REFERENCES:
patent: 4054389 (1977-10-01), Owen
patent: 5166755 (1992-11-01), Gat

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