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Innovative design of cassegrain solar concentrator system for indoor illumination utilizing chromatic aberration to filter out ultraviolet and infrared in sunlight

Many applications and related studies of solar energy have been focused on guiding sunlight into indoor for illumination purposes. To approach the objective, one of the high efficient solar concentrator is base on cassegrain construction. However, exposure of UV in sunlight has been proved to be hazardous to human, and rich heat content of IR degrades illumination quality. In order to solve the two problems, we develop an innovative cassegrain solar concentrator system utilizing the theory of chromatic aberration by a chromatic lens to reduce UV and IR. A dispersion model to consider the impact of the chromatic lens and a guiding fiber is also proposed. In the result, the system can filter out the UV completely and half of the IR. Further, the chromaticity coordinates of collected light for illumination is almost equal to sunlight, and the color difference is so small that it appears equal to the human eye.