Document Type : Original Article
Authors
Department of Color Physics, Institute for Color, Science and Technology, P.O. Box 16765-654, Tehran, Iran
Abstract
The reflective spectrophotometers are available to users in benchtop and portable models with different
geometries and designs to measure whiteness and tint attribute of white specimens and color coordinates
of the samples. In these devices, factors like illumination-observation geometry, the type of light source
and its lifetime, light scattering devices and optical receivers play an effective role in their precision and
accuracy, which will somehow affect the outputs of the devices. In this research, the role of precision and
accuracy of spectrophotometers in measuring the whiteness and tint indices of a BCRA reference white
ceramic tile was investigated. For this purpose, seven spectrophotometers with different models and the
same geometry (di: 8°) were used. The results showed that not only the operation and maintenance of the
device directly and potentially plays an important role in the precision and accuracy of the results, but
also spectrophotometers with the same geometry and different models whose precision and accuracy are
within acceptable tolerances, different results are observed in the whiteness index assessment. So that the
difference of the measured whiteness index compared to the real va lues ranges from 0.16 to 3.28 units.
Keywords
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