Andersen, MarilyneMichel, L.Roecker, C.Scartezzini, Jean-Louis2010-10-252010-10-252010-10-251999https://infoscience.epfl.ch/handle/20.500.14299/56108Many daylighting applications require a precise knowledge of the transmission properties of fenestration materials, called bi-directional transmission distribution functions (BTDF), which necessitate systematic and accurate measurements. A new type of bi-directional photogoniometer, based on advanced imaging techniques, has been developed to this end; its mechanical concept, the calibration procedures and the first results are presented here.daylightingfenestration materialsBTDFbi-directional photogoniometertext::conference output::conference paper not in proceedings