The Effect of the Light Diffusers on Spatial Uniformity of the Solar Simulator

In this study, the effect of using photovoltaic light diffusers on the performance of the solar simulator has been demonstrated, which consists of a 20-watt halogen lamp combined with white, green, and blue light emitting diodes of high-power capacities, which has been arranged in this research work so that the halogen lamp is centrally positioned on the unit of the solar simulator and the light emitting diodes distributed regularly around it, where the solar simulator consists of eight solar simulator units. The optical system of the solar simulator include: light diffusers, lenses and filters for the purpose of obtaining better spatial uniformity. The outer structure is built so that the source height is made to be adjustable to control the power light intensity. The spatial uniformity is the main parameters in the development of a solar simulator to obtain the best match for solar radiation in the laboratory environment and to meet the international standard (IEC 60904-9), where the class (A) has been achieved according to this standard. This study presents a practical investigation of the effect of photovoltaic light diffusers on the spatial distribution of the intensity of the radiation produced by the halogen lamp solar simulator with a set of high-energy light-emitting diodes consisting of nine solar simulators..