Methods of measuring the colour of opaque fluorescent materials

McKinnon, Rona A.

doi:10.1111/j.1478-4408.1987.tb03751.x

Cited by 4 publications

References 12 publications

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Colorimetry

Marcus

2009

Digital Encyclopedia of Applied Physics

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We live in a very colorful world. Modern materials provide us with products in a multitude of colors that could only have been dreamt of in the past. Scientist and technicians use colorimetry, the measurement of color, to ensure that consumers get the colors that they are expecting to get consistently over time. In colorimetry, we try to simulate the human experience to quantify and control color. Color perception depends upon the light source illuminating an object, the pigments and dyes used in manufacturing the object, the eye of the observer whose impulses are translated by the brain as a color. To simulate color perception, standardized illuminants (mathematical light sources) were defined and color‐matching functions (simulating the eye‐brain combination) were experimentally derived. Spectrophotometers are used to characterize objects. An object may absorb light, scatter and reflect light, and/or transmit light. Spectrophotometers measure the reflectance and/or transmittance of the object at given wavelengths of the visible spectrum. Perceptual color coordinates of the object can be calculated for the spectrophotometric measurements. Colorimeters determine color coordinates directly during the measurement using broadband spectral devices. Special techniques are required to measure fluorescent samples that not only reflect light but emit light. Measuring materials containing traditional colorants and metallic flakes require instruments with multiple viewing angles. Measuring materials containing interference pigments require instruments with multiple illumination angles and multiple viewing angles. Measuring lamps and other light emitters require spectral radiometers and radiometric colorimeters.

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Colorimetry

Marcus

2009

Digital Encyclopedia of Applied Physics

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Colorimetry of durable fluorescent retroreflective materials

Burns

Johnson

Pavelka

1995

Color Research & Application

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The development of durable daylight fluorescent retroreflective sheetings has led us to investigate some of the factors that influence color measurement of these materials. the colorimetry of retroreflective materials is particularly sensitive to measurement geometry. the added aspect of fluorescence increases the spectral uncertainties, making appearance measurements even more difficult. the visual properties used to describe fluorescent retroreflective materials should include chromaticity, lightness, peak spectral radiance factor, nighttime color, and color stability on exposure. A number of test methods exist for these measurements; however, practical experience in applying these methods to fluorescent materials shows significant variation in the resulting measured values. Colorimetric measurements on commercial instruments using 45/0 (0/45) geometry, a simulated D65 illuminant, and the CIE 2° standard observer yield results that are inadequate for precise quality control of durable fluorescent retroreflective materials. the uncertainty can be reduced by the use of transfer standards, provided that the standard is similar to the sample in both hue and fluorescent emission. Ultimately, the wide availability of commercial 2‐monochromator spectrocolorimeters will be required. © 1995 John Wiley & Sons, Inc.

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The Measurement of Color

Marcus

1998

Color for Science, Art and Technology

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Methods of measuring the colour of opaque fluorescent materials

Cited by 4 publications

References 12 publications

Colorimetry

Colorimetry

Colorimetry of durable fluorescent retroreflective materials

The Measurement of Color

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