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In order to achieve a large deployment of renewable energies, the electricityproduction costs have to be as low as possible. Many different technologieshave been proposed to achieve the best efficiency to cost ratio. One of thoseis concentrating photovoltaics (CPV) which takes advantage of the highefficiency of multi-junction cells while limiting the costs by reducing thesize of the cell and concentrating the direct irradiance with a cheaper opticalelement. Next to the widely used Fresnel lenses concave mirrors could be ofinterest as concentrator optic. As for the whole module those optics have tominimize losses and production costs at once. Measuring scattering and slopeerrors of the mirrors is of great importance to achieve an optimal design andproduction process. Therefore an optical test site doing so by observing the 2Dirradiance distribution in the focal point has been built at the FraunhoferISE. The aim of this thesis is to characterize this test site. Therefore thebehavior of the different components (camera, objective, mirrors, glass plate,light source and diffuser film) as well as of the whole test site have beenmeasured and modeled. While most parts of the test site could be modeled in asatisfactory way, the diffuser film still isn't fully understood. Therefore anempirical calibration has been done.

Characterization of a Test Site for the Measuring of the Focal Point of Reflective Optical Elements for Concentrator Photovoltaic