Catadioptric freeform optical system design for LED off-axis road illumination applications
AffiliationUniv Arizona, Coll Opt Sci
MetadataShow full item record
PublisherOPTICAL SOC AMER
CitationCatadioptric freeform optical system design for LED off-axis road illumination applications 2017, 26 (2):A54 Optics Express
Rights© 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
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AbstractThe aim of this paper is to develop a new composite structure of catadioptric optical system containing both freeform refractive surface and freeform total internal reflective (TIR) surface for LED road illumination applications. The role of freeform refractive part is to generate the shifted general rectangular illumination pattern to optimally match the shape of the road surface. The application of TIR mechanism is aimed to control the stray light in the sidewalk direction of the road luminaire and maximize the efficient energy efficiency. In this paper, we use the "double pole" ray mapping technique to design the refractive optical surface and the theta-phi coordinate ray mapping technique to derive the freeform TIR surface. The simulation shows that the novel catadioptric design has relatively high collection efficiency, thus high average illuminance level inside the effective illumination area. This lens also has good control of stray light on the backside of the road luminaire. (c) 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
NoteOpen access journal.
VersionFinal published version
SponsorsWuhan Science and Technology Bureau ; Huazhong University of Science and Technology [2017KFYXJJ026]