Industrial colorimeter having lamp aging compensation means

Details Industrial colorimeter having lamp aging compensation means Industrial colorimeter having lamp aging compensation means

1990-06-14

1991-08-27

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

364526, G01J 350

Patent

active

050429485

ABSTRACT:
A colorimeter provides compensation for changes in the color signature of an object due to lamp aging. A current measuring circuit measures current to the lamp during an initial training of the colorimeter and stores a value I.sub.T indicative of the lamp current at training. When an object is scanned by the colorimeter, lamp current is again sensed and assigned a value I.sub.S. Comparison between a sensed color signature and a stored color signature then occurs. Compensation is accomplished by modifying one of the two signatures by a ratio including I.sub.S and I.sub.T.

REFERENCES:
patent: 4076421 (1978-02-01), Kishner
patent: 4449821 (1984-05-01), Lee

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