G - Physics – 01 – J
Patent
G - Physics
01
J
73/56
G01J 3/28 (2006.01) G01J 3/46 (2006.01) G06E 3/00 (2006.01) G06G 7/75 (2006.01)
Patent
CA 1067714
ABSTRACT OF THE DISCLOSURE This invention discloses a novel apparatus for the measurement of colour 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. The automatic computing colour meter device is accurate, has good light throughput and has an improved signal to noise ratio. It has wide dynamic range, fast response and automatically produces the desired results in a relatively inexpensive device. Reference may be made to a standard source and the machine functions without the need for digital integration techniques.
280563
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