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INTEGRATING‐SPHERE ERRORS IN THE COLORIMETRY OF FLUORESCENT MATERIALS
Author(s) -
ALMAN DAVID H.,
BILLMEYER FRED W.
Publication year - 1976
Publication title -
color research and application
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 62
eISSN - 1520-6378
pISSN - 0361-2317
DOI - 10.1111/j.1520-6378.1976.tb00030.x
Subject(s) - integrating sphere , radiance , irradiance , colorimetry , fluorescence , optics , wavelength , specular reflection , fluorescent lamp , materials science , biological system , physics , biology
The wavelength dependence of the efficiency of an integrating sphere alters the relative spectral irradiance of the light‐source system of which it is a part. Since the total radiance factor (reflected plus fluoresced energy) of a fluorescent material depends upon this irradiance, wavelength‐dependent changes in the efficiency of the integrating sphere can lead to significant variations in the total radiance factor. Such variations can result from changes in the fractional area of the sample port, changes in the sphere wall coating, or the change from specular component included to excluded. Conditions minimizing the importance of these variations are described, but for the accurate colorimetry of fluorescent materials, the use of45°/0° geometry is recommended.