2024-03-28T11:33:18Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2297542021-02-23T04:54:24Zcom_10261_93com_10261_4col_10261_346
An insight into the present capabilities of national metrology institutes for measuring sparkle
Ferrero, Alejandro
Basic, N.
Campos Acosta, Joaquín
Pastuschek, M.
Perales, E.
Porrovecchio, G.
Šmid, M.
Schirmacher, A.
Velázquez, J.L.
Martínez-Verdú, F.M.
European Commission
Comunidad de Madrid
Sparkle
Texture
Reflectance
Contrast threshold
Gonio-spectrophotometry
18 pags., 15 figs., 1 tab.
Large-effect pigments, due to their strongly specular reflectance, produce a special visual texture known as sparkle. The use of these pigments in many industries (automotive, cosmetic, paper, architecture...) makes the control of this visual texture necessary. Sparkle measurands have been defined in this article, so that traceability of sparkle measurements can be provided by national metrology institutes or designated institutes. Some of them (Physikalisch-Technische Bundesanstalt, Eidgenössisches Institut für Metrologie, Cesky Metrologicky Institut and Consejo Superior de Investigaciones Científicas) have tested their existing measurement capabilities for the defined sparkle measurands, and their results are presented and thoroughly compared. Two possible sources of systematic error have been identified: inadequate illumination and collection solid angles, and an inadequate size of the virtual aperture used to assess the luminous flux reflected by the effect pigments. Finally, it has been shown that the measures correlate excellently with the sparkle visual data. The results shown in this research support the sparkle measurands defined here as adequate quantities for defining the standard measurement scale of sparkle claimed by industry.
This article was written within the EMPIR 16NRM08
Project ‘Bidirectional reflectance definition’ (BiRD). The
EMPIR is jointly funded by the participating countries within
EURAMET and the European Union. Some of the authors
(Instituto de Optica ‘Daza de Valdes’) are also grateful to
Comunidad de Madrid for funding the project S2018/NMT4326-SINFOTON2-C.
2021-02-16T12:00:04Z
2021-02-16T12:00:04Z
2020-11-05
2021-02-16T12:00:05Z
artículo
http://purl.org/coar/resource_type/c_6501
doi: 10.1088/1681-7575/abb0a3
issn: 1681-7575
Metrologia 57: 065029 (2020)
http://hdl.handle.net/10261/229754
10.1088/1681-7575/abb0a3
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/100012818
#PLACEHOLDER_PARENT_METADATA_VALUE#
S2018/NMT4326-SINFOTON2-C
Publisher's version
http://dx.doi.org/10.1088/1681-7575/abb0a3
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open
Institute of Physics Publishing