Method and apparatus for measuring and controlling the color...

Details Method and apparatus for measuring and controlling the color... Method and apparatus for measuring and controlling the color...

B - Operations, Transporting

05

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341/40, 73/55

B05C 11/10 (2006.01) D06B 23/26 (2006.01) D06P 5/00 (2006.01) G01J 3/46 (2006.01) G01J 3/12 (2006.01) G01N 21/86 (2006.01)

Patent

CA 1169140

Abstract of the Disclosure Apparatus for measuring and controlling the color of a moving web in which a circular variable bandpass filter having a passband varying substantially continuously with angular displacement through the optical spectrum is interposed in the optical path between the web and a detector and is rotated to produce a detector output which periodically scans the optical spectrum. In one disclosed embodiment, the detector outputs at the various wavelengths are weighted to produce X, Y and Z tristimulus values while, in another disclosed embodiment, dye flows are so controlled as to minimize the total square error between the measured reflectance spectrum and the desired reflectance spectrum.

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