In the research and development of photovoltaic cells, we need to use a standardised light source. For this purpose, we use artificial sun simulators. They have to be adequately calibrated. One of the challenges of calibration is ensuring homogeneous irradiance of the target surface. When using artificial sun simulators made with light-emitting diodes, we can change the homogeneity of irradiance by changing the power levels of individual light-emitting diodes.
In this master's thesis, we have developed a measuring system that measures the homogeneity of irradiance on the target surface of the artificial sun simulator and iteratively changes the power levels of the light-emitting diodes so that the best homogeneity is achieved. The system automatically calibrates the artificial sun faster compared to manual calibration. We have achieved a 40% increase in the homogeneity of irradiance on the target surface. Following automatic calibration to natural sunlight irradiance, the nonhomogeneity was reduced to 4,2%. The calibration was completed in only 5 minutes.
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