Title:
COMPARISON TYPE OPTICAL MEASURING APPARATUS
Document Type and Number:
Japanese Patent JPS5351785
Kind Code:
A
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.
Inventors:
PAAKU FURENCHI
UIRIAMU ETSUCHI KONAUEI
UIRIAMU ETSUCHI KONAUEI
Application Number:
JP10686677A
Publication Date:
May 11, 1978
Filing Date:
September 07, 1977
Export Citation:
Assignee:
STERNDENT CORP
International Classes:
G01J3/50; A61C19/04; G01J3/08; G01J3/51; H03M1/00; G01J3/02; (IPC1-7): A61B1/00; G01J3/50
Domestic Patent References:
| JPS50112519U | 1975-09-13 | |||
| JPS5243573A | 1977-04-05 | |||
| JPS3718596Y1 | ||||
| JPS49128635U | 1974-11-05 |