Optics: measuring and testing – With plural diverse test or art
Patent
1996-05-15
1997-06-03
Evans, F. L.
Optics: measuring and testing
With plural diverse test or art
356319, 2504611, G01J 300
Patent
active
056360150
ABSTRACT:
The measuring apparatus of the present invention measures the optical properties of a sample containing a fluorescent material by irradiating the sample with light containing a UV component. In the present invention are provided a first light source for irradiating the sample with light containing a UV component, a second light source for irradiating the sample with light which does not contain a UV component, light receiving element for receiving light reflected from the sample irradiated by said light sources, and output means for generating weighting coefficients for weighting the output of the light receiving element during emission by each light source. The optical properties of the sample is calculated based on the output of the light receiving element for a first light source, output of the light receiving element for a second light source, and the respective weighting coefficients. Accordingly, measurement values can be obtained which are equal to values when measurement is accomplished with a standard light source.
REFERENCES:
patent: 4699510 (1987-10-01), Alguard
patent: 5384641 (1995-01-01), Imura
Rolf Griesser, "Assessment of Whiteness and Tint of Fluorescent Substrates with Good Interinstrument Correlation," Color Research and Application, vol. 19, No. 6, Dec. 1994, pp. 446-460.
J. Anthony Bristow, "The Calibration of Instruments for the Measurement of Paper Whiteness," Color Research and Application, vol. 19, No. 6, Dec. 1994, pp. 475-483.
Japanese Industrial Standard, JIS Z 8717--1989, "Methods of Measurement for Colour of Fluorescent Objects."
Imai Kiyoshi
Imura Kenji
Kawabata Tokihisa
Makino Masayuki
Evans F. L.
Minolta Co. , Ltd.
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