Optics: measuring and testing – By shade or color – With sample responsive to plural colors applied simultaneously
Patent
1991-09-04
1995-02-07
McGraw, Vincent P.
Optics: measuring and testing
By shade or color
With sample responsive to plural colors applied simultaneously
356406, 2502273, G01N 2125
Patent
active
053879775
ABSTRACT:
A spectrophotometer apparatus (200) is adapted to provide spectral reflectance measurements of an object sample (236) under test, particularly optical characteristics of colored surfaces comprising metallic or pearlescent particles. The apparatus (200) comprises a source light (226) and a reflection optics assembly. Signals representative of reflected light are analyzed and data is generated representative of the spectral response characteristics of the object sample (236). The apparatus (200) employs a plurality of fiber optic bundles (248, 250, 252) for receiving light reflected from the object sample (236), with each of the fiber optic bundles (248, 250, 252) being positioned at one of a corresponding plurality of fixed angles different from the angle of illumination of the source light (226). Reflectance is measured at each angle by sequential switching such that light is impaired from being received by all but a subset of the plurality of multiple angles. Light received from the fiber optic bundles is transferred to a single array of integral interference-filter/photodiode devices (284) which modulate the light and determine the spectral characteristics thereof. With the use of fiber optic devices, a single source of illumination and a single optical detector arrangement, the spectrophotometer apparatus (200) is employed within an optimally small packaging configuration, and the apparatus (200) can be maintained in a portable mode while maintaining relatively high accuracy and repeatability.
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Berg Bernard J.
Boes Thomas J.
Cargill Mark A.
Hantis K. P.
McGraw Vincent P.
X-Rite Incorporated
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