Schmid, T.T.SchmidHornung, ThorstenThorstenHornungNitz, PeterPeterNitz2022-03-122022-03-122012https://publica.fraunhofer.de/handle/publica/37739910.1063/1.4753840We report about the indoor characterization of secondary optical elements (SOEs) at Fraunhofer ISE. The concentration profile at the SOE's exit aperture under various illumination conditions is obtained by imaging a transmissive diffuser via a CCD camera. This method is very fast, easy and can be used to identify deviations from designed shape of the SOEs. To compare different samples quantitatively a simulation model was set up. In this paper we describe the experimental setup, present results for different refractive SOEs made of glass and estimate the loss in a Fresnel lens based CPV system due to the identified errors.enSolarthermie und OptikIII-V und Konzentrator-PhotovoltaikAngewandte Optik und funktionale OberflächenKonzentrator-OptikKonzentratoroptik621conference paper