  In order to achieve a large deployment of renewable energies, the electricity
production costs have to be as low as possible. Many different technologies
have been proposed to achieve the best efficiency to cost ratio. One of those
is concentrating photovoltaics (CPV) which takes advantage of the high
efficiency of multi-junction cells while limiting the costs by reducing the
size of the cell and concentrating the direct irradiance with a cheaper optical
element. Next to the widely used Fresnel lenses concave mirrors could be of
interest as concentrator optic. As for the whole module those optics have to
minimize losses and production costs at once. Measuring scattering and slope
errors of the mirrors is of great importance to achieve an optimal design and
production process. Therefore an optical test site doing so by observing the 2D
irradiance distribution in the focal point has been built at the Fraunhofer
ISE. The aim of this thesis is to characterize this test site. Therefore the
behavior of the different components (camera, objective, mirrors, glass plate,
light source and diffuser film) as well as of the whole test site have been
measured and modeled. While most parts of the test site could be modeled in a
satisfactory way, the diffuser film still isn't fully understood. Therefore an
empirical calibration has been done.
