Tristimulus colormeter with internal reflectance compensation

Details Tristimulus colormeter with internal reflectance compensation Tristimulus colormeter with internal reflectance compensation

1976-11-02

1978-12-26

Evans, F. L.

Optics: measuring and testing

By shade or color

Tristimulus examination

356425, 356418, G01J 346, G01J 348

Patent

active

041313674

ABSTRACT:
A tristimulus colorimeter employs a multiplexed dual slope integrator digital voltmeter wherein unknown and reference light beams are compared by sequentially applying unknown and reference electrical signals representative of the two respective light beams to the non-inverting and inverting inputs, respectively, of the integrator amplifier. Moreover, a compensating circuit provides for compensation of the colorimeter output signals with respect to reflectance error encountered in the optics portion of the colorimeter with such compensation being provided as a function of the light intensity from the colorimeter light source.

REFERENCES:
patent: 2774276 (1956-12-01), Glasser
patent: 3528749 (1970-09-01), Bowker
patent: 3684378 (1972-08-01), Lord
patent: 3690772 (1972-09-01), Enol
patent: 3973849 (1976-08-01), Jackson et al.
patent: 3986777 (1976-10-01), Roll
patent: 4047819 (1977-09-01), Goldberg

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