Automatic computing color meter

Details Automatic computing color meter Automatic computing color meter

1977-06-17

1979-08-21

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With aperture mask

250226, 356323, 356405, 364526, G01J 342, G01J 350

Patent

active

041651804

ABSTRACT:
A novel apparatus for the measurement of color of a sample which comprises an illumination means to illuminate the sample, an electro-optical sensing head to receive the light from the illuminated sample and to output electronic signals and an electronic processing unit adapted to process the signals. The system uses, in the preferred embodiment, a moving spatial filter to modulate a spectrum and a masking means to selectively mask the light from the modulated spectrum. A reference optical path and reference light signals are produced for subsequent processing with the light from the sample, corrected for any errors produced and processed in an analogue electronic unit to produce the tristimulus values X, Y, Z and the chromaticity coordinates x, y of the sample with respect to CIE standards for luminance and chromaticity values.

REFERENCES:
patent: 2046958 (1936-07-01), Marvin
patent: 3314327 (1967-04-01), Killpatrick et al.
patent: 3874799 (1975-04-01), Isaacs et al.
patent: 4093991 (1978-06-01), Christie, Jr. et al.
Kok et al., Applied Optics, vol. 10, No. 12, Dec. 1971, pp. 2617-2620.

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