Affiliation:
1. Callaghan Innovation
2. Consejo Superior de Investigaciones Científicas
3. LNE-CNAM (EA 2367)
4. Cesky Metrologicky Institut (CMI)
5. Physikalisch-Technische Bundesanstalt
Abstract
In recent years, there has been a growing interest in the measurements
of the bidirectional reflectance distribution function (BRDF) in
industry and research and development. However, there is currently no
dedicated key comparison to demonstrate the scale conformity. To date,
scale conformity has been proved only for classical in-plane
geometries, in comparisons between different national metrology
institutes (NMIs) and designated institutes (DIs). This study aims at
expanding that with nonclassical geometries, including, for the first
time, to the best of our knowledge, two out-of-plane geometries. A
total of four NMIs and two DIs participated in a scale comparison of
the BRDF measurements of three achromatic samples at 550 nm in five
measurement geometries. The realization of the scale of BRDF is a
well-understood procedure, as explained in this paper, but the
comparison of the measured values presents slight inconsistencies in
some geometries, most likely due to the underestimation of measurement
uncertainties. This underestimation was revealed and indirectly
quantified using the Mandel–Paule method, which provides the
interlaboratory uncertainty. The results from the presented comparison
allow the present state of the BRDF scale realization to be evaluated,
not only for classical in-plane geometries, but also for out-of-plane
geometries.
Funder
European Metrology Programme for
Innovation and Research
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Cited by
3 articles.
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