García Fernández, BertaGarcía Botella, AngelÁlvarez Fernández-Balbuena, AntonioVázquez Molini, DanielBernabéu Martínez, EusebioWinston, RolandGordon, Jeffrey M.2024-02-122024-02-122009-08-21Fernandez-Balbuena, A. A., Vázquez-Moliní, D., Garcia-Fernandez, B., Garcia-Botella, A., & Bernabeu, E. (2009, August). Skylight: a hollow prismatic CPC. In Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VI (Vol. 7423, pp. 239-250). SPIE.0277-786X10.1117/12.825818https://hdl.handle.net/20.500.14352/101327Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States. © (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE).Many applications involve the use of a compound parabolic concentrator (CPC) like, natural lighting, thermal applications, optics for illuminators, optical fibre coupling and solar energy. The use of a CPC in reverse mode for natural lighting gives the chance to use it as a lighting skylight in ceilings because light output is controlled inside the design angle, on the contrary having a low flux transfer ratio because of the reduced area of the entrance pupil regarding exit pupil. The authors propose an innovative 3D hollow prismatic CPC (HPCPC) made of a dielectric material, which has a high efficiency comparing it with aluminium CPC. The basic idea is to use a hollow prismatic light guide with CPC shape. This paper reports 2D, 3D design and numerical analysis by raytracing software, also experimental results are shown. The system works almost like a true CPC when light enters through standard entrance pupil and also collect light that enters outside entrance pupil. Performance and efficiency of the prismatic CPC is in average 300% higher than standard aluminium CPC for collimated light in a range from 0º to 85º. A prototype has been developed and tested.engbook parthttps://doi.org/10.1117/12.825818https://www.spiedigitallibrary.org/conference-proceedings-of-spie/7423/74230T/Skylight-a-hollow-prismatic-CPC/10.1117/12.825818.shortopen access535.1628.9681.7.03compound parabolic concentratornonimaging opticsnatural lightingprismatic filmdaylighthollow light guideÓptica (Física)Física de materiales2209.19 Óptica Física2209.11 Luz