Fluorescence of ceramic color standards

Annette Koo; John F. Clare; Kathryn M. Nield; Andrew Deadman; Eric Usadi

doi:10.1364/AO.49.002376

Applied Optics
Vol. 49,
Issue 12,
pp. 2376-2381
(2010)
•https://doi.org/10.1364/AO.49.002376

Fluorescence of ceramic color standards

Annette Koo, John F. Clare, Kathryn M. Nield, Andrew Deadman, and Eric Usadi

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Annette Koo, John F. Clare, Kathryn M. Nield, Andrew Deadman, and Eric Usadi, "Fluorescence of ceramic color standards," Appl. Opt. 49, 2376-2381 (2010)

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Abstract

Fluorescence has been found in color standards available for use in calibration and verification of color measuring instruments. The fluorescence is excited at wavelengths below about $600 nm$ and emitted above $700 nm$ , within the response range of silicon photodiodes, but at the edge of the response of most photomultipliers and outside the range commonly scanned in commercial colorimeters. The degree of fluorescence on two of a set of 12 glossy ceramic tiles is enough to introduce significant error when those tiles have been calibrated in one mode of measurement and are used in another. We report the nature of the fluorescence and the implications for color measurement.

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Tile	$Δ {E^{*}}_{a b}$	Tile	$Δ {E^{*}}_{a b}$	Tile	$Δ {E^{*}}_{a b}$
Pale grey	0.37	Deep pink	0.09	Green	0.32
Mid grey	0.30	Red	3.50	Difference green	0.28
Difference grey	0.23	Orange	9.61	Cyan	0.33
Deep grey	0.28	Yellow	0.05	Deep blue	0.16

Color	Set A ( $488 nm$ )	Set A ( $532 nm$ )	Set B ( $488 nm$ )	Set B ( $532 nm$ )	Set C ( $532 nm$ )	Set D ( $532 nm$ )
Pale grey	0%	0%		0%	0%	0%
Orange	30%	28%	24%	15%	16%	34%
Red	24%	27%	24%	26%	26%	46%
Yellow	1%	0%		0%	0%	0%

	Illuminant A		Illuminant D65
	$2 °$ Observer	$10 °$ Observer	$2 °$ Observer	$10 °$ Observer
$L^{*}$	$- 1.14$	$- 1.20$	$- 1.71$	$- 1.85$
$a *$	3.01	3.03	3.48	3.74
$b^{*}$	8.99	9.05	8.17	7.98
x	0.0119	0.0121	0.0251	0.0261
y	$- 0.0014$	$- 0.0016$	0.0077	0.0070
Y	$- 1.78$	$- 1.85$	$- 2.34$	$- 2.45$

	Illuminant A		Illuminant D65
	$2 °$ Observer	$10 °$ Observer	$2 °$ Observer	$10 °$ Observer
$L^{*}$	$- 1.52$	$- 1.54$	$- 1.88$	$- 1.91$
$a^{*}$	2.45	2.22	2.64	2.44
$b^{*}$	2.23	2.22	1.63	1.59
x	0.0103	0.0098	0.0160	0.0153
y	$- 0.0045$	$- 0.0040$	$- 0.0009$	$- 0.0005$
Y	$- 1.40$	$- 1.40$	$- 1.47$	$- 1.47$

Tile	$Δ {E^{*}}_{a b}$	Tile	$Δ {E^{*}}_{a b}$	Tile	$Δ {E^{*}}_{a b}$
Pale grey	0.37	Deep pink	0.09	Green	0.32
Mid grey	0.30	Red	3.50	Difference green	0.28
Difference grey	0.23	Orange	9.61	Cyan	0.33
Deep grey	0.28	Yellow	0.05	Deep blue	0.16

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Applied Optics