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Use of bidirectional transmittance distribution function measurements to determine transmittance haze
Measurement Standards Laboratory of New Zeal, New Zealand.
Measurement Standards Laboratory of New Zeal, New Zealand.
LNE-CNAM, France.
LNE-CNAM, France.
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2023 (English)In: Metrologia, ISSN 0026-1394, E-ISSN 1681-7575, Vol. 60, no 5, article id 055003Article in journal (Refereed) Published
Abstract [en]

Accurate and traceable measurements of transmittance haze are required for quality control in various different industries, such as optoelectronics, automobiles, and agriculture. Transmittance haze is defined as the fraction of light transmitted through a material that deviates from the incident beam by more than 2.5∘. Various documentary standards specify the use of an integrating sphere with a prescribed geometry for the measurement of transmittance haze. This paper uses goniometric measurements of the bidirectional transmittance distribution function (BTDF) to calculate transmittance haze according to the definition and demonstrates that the sphere-based realisation of transmittance haze specified in the documentary standards does not agree with the definition, with the difference being up to 20% for some samples. The BTDF measurements are also used to simulate the integrating sphere haze, allowing the sensitivity of the sphere haze to errors in the integrating sphere geometry to be calculated. 

Place, publisher, year, edition, pages
Institute of Physics , 2023. Vol. 60, no 5, article id 055003
Keywords [en]
BTDF, goniospectrophotometry, transmittance haze, Incident light, Spheres, Bidirectional transmittance distribution function, Distribution-functions, Fraction of light, Function measurements, Incident beams, Integrating spheres, Measurements of, Transmittance distribution, Distribution functions
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-66018DOI: 10.1088/1681-7575/ace910Scopus ID: 2-s2.0-85166957401OAI: oai:DiVA.org:ri-66018DiVA, id: diva2:1788010
Note

This work was funded by the New Zealand government and has been done in the frame of the Project 18SIB03 BxDiff, that has received funding from the EMPIR programme co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation programme.

Available from: 2023-08-15 Created: 2023-08-15 Last updated: 2023-08-15Bibliographically approved

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