Fig. 5

Experimental setup for the angular response measurements of a multi-directional input optics. Three mounting points are used for the same robot, Position 1 for the upper area between 0^∘ and 36^∘, Position 2 (using the same aluminium-profile as Position 1 but fixed on Position 3 base) for the section between 36^∘ and 60^∘, and Position 3 for the lower area between 60^∘ to 90^∘. A rotation table is used to measure the radiance in different azimuthal sections