Characterisation of Angular Dependent Optical Properties of Different Coloring Technologies Employed in BIPV Products.

Markus Babin, Adrian Alejo Santamaria Lancia*, Anders Thorseth, Sune Thorsteinsson

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    Accurate determination of the angular dependent color of BIPV products is necessary to aid architects in matching BIPVs to surrounding building materials. A methodology for the study and characterization of visual appearance at different viewing angles is presented. This includes measurements of spectra of reflected light from BIPV samples for the determination of single-plane BRDF and IAM. BRDFs are converted to CIELAB color coordinates to analyze lightness, chroma and color saturation. Samples of three different technologies (printed ceramic inks, thin-film coatings and colored interlayers) are investigated. Results show vastly different angular dependency for sample groups, ranging from almost uniform (ceramic ink) to iridescent (thin-film coating) appearance. Differences are also observed between ceramic inks of different colors with correlation between specularity of reflection, IAM and angular constancy of appearance. For thin-film coated samples, correlation is shown between reflectance spectra, IAM and iridescence. Samples with colored interlayers show irregular angular appearance due to a textured glass surface.
    Original languageEnglish
    Title of host publicationProceedings of 37th European Photovoltaic Solar Energy Conference and Exhibition
    Publication date2020
    ISBN (Print)3-936338-73-6
    Publication statusPublished - 2020
    Event37th European PV Solar Energy Conference and Exhibition - Online
    Duration: 7 Sept 202011 Sept 2020
    Conference number: 37


    Conference37th European PV Solar Energy Conference and Exhibition
    Internet address


    • Building Integrated PV (BIPV)
    • Experimental Methods
    • Optical Properties
    • Performance
    • Color


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