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Measuring and modelling scattering properties of Roman window glass for daylight simulation

TitleMeasuring and modelling scattering properties of Roman window glass for daylight simulation
Publication TypePoster
Year of Publication2017
AuthorsNoback A, Grobe LO, Greiff S, Komp J, Lang F
Conference NameGlass of the Caesars @ 30
Date Published11/2017
Place PublishedLondon, UK

Lighting is one of the key elements of architectural design. The characteristics of daylit interior spaces depend heavily on the optical properties of the glazing material. The production processes of Roman window glass lead to air inclusions, uneven thickness and undulated surfaces, which result in scattering of the transmitted light. The amount of scatter, differences between specimens in terms of era, origin and production method have thus far not been investigated, likewise the impact of scattering properties on the Roman architectural space. In a feasibility study the scattering properties of Roman glazing materials are quantitatively ascertained for the first time. Therefore the Bidirectional Scattering Distribution Function (BSDF) of a small number of representative specimens is measured with a scanning goniophotometer. Based on these measurements data-driven transmission models are prepared for daylight simulation and applied to examine the impact of the scattering properties on the illuminance distribution in an exemplary architectural scene. In this context the effect of the state of preservation on measurement accuracy is investigated and the initial results of the study are discussed for wider application.

Citation Key72