Colorimetry and its accuracy in the measurement of fluorescent materials by the two‐monochromator method

Abstract

The fundamental procedure involved in the two‐monochromator method for determining the spectral radiance factors of fluorescent materials is described, and some measured results are presented. The colorimetric accuracy of the method was confirmed by comparing two sets of tristimulus values: (1) those based on the two‐monochromator method and calculated from the reflected and the fluorescent spectral radiance factors and the spectral power distributions of a tungsten‐halogen lamp and a xenon lamp (which were determined separately); and (2) those calculated from the total radiance factors obtained from the measurement under polychromatic illumination, where the fluorescent materials were irradiated with the tungsten and the xenon lamp. The color differences between these sets of tristimulus values in CIE‐LUV color space were estimated to be less than 1.0 unit, irrespective of the illuminant or the source.

Methods of measuring the colour of opaque fluorescent materials

“…In [21], Minato et al discuss the accuracy of the spectrofluorimetric method. They compare values of /IT(;.)…”

Spectrophotometric error in colour coordinates introduced by fluorescence of white calibration tile

“…If this is not accomplished, surface colour of fluorescent samples has to be measured by the double monochromator method. 6,7…”

Estimation of bispectral Donaldson matrices of fluorescent objects by using two illuminant projections

“…Traditionally, standard procedures for using both onemonochromator and two-monochromator methods were proposed by the CIE [5], and the standardization and accuracy in fluorescent radiance measurement were discussed in the fields of optics, illumination, and color science [6][7][8][9][10]. Of the onemonochromator method, a monochromator was placed between the light source and the sample, or between the sample and the detector.…”