Tristimulus colorimeter with internal reflectance compensation

Details Tristimulus colorimeter with internal reflectance compensation Tristimulus colorimeter with internal reflectance compensation

G - Physics

01

J

73/164, 73/56

G01J 3/46 (2006.01) A61C 19/10 (2006.01) G01J 3/51 (2006.01) G01J 3/02 (2006.01)

Patent

CA 1080996

In re application of Park French and William il. Conaway For: TRISTIMULUS COLORIMETER WITH INTERNAL REFERENCE COMPENSATION ABSTRACT OF THE DISCLOSURE 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 respect- ive light beams to the non-inverting and inverting inputs, re- spectively, of the integrator amplifier. Moreover, a compensat- ing 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 colori- meter light source.

289544

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