Non-uniformly sampled grids in double pole coordinate system for freeform reflector construction

Donglin Ma, Shaun Pacheco, Zexin Feng, Rongguang Liang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We propose a new method to design freeform reflectors by nonuniformly sampling the source intensity distribution in double pole coordinate system. In double pole coordinate system, there is no pole for the whole hemisphere because both poles of the spherical coordinate system are moved to southernmost point of the sphere and overlapped together. With symmetric definition of both angular coordinates in the modified double pole coordinate system, a better match between the source intensity distribution and target irradiance distribution can be achieved for reflectors with large acceptance solid angle, leading to higher light efficiency and better uniformity on the target surface. With non-uniform sampling of the source intensity, we can design circular freeform reflector to obtain uniform rectangular illumination pattern. Aided by the feedback optimization, the freeform reflector can achieve the collection efficiency for ideal point source over 0.7 and relative standard deviation (RSD) less than 0.1.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE
Volume9572
ISBN (Print)9781628417388
DOIs
StatePublished - 2015
EventNonimaging Optics: Efficient Design for Illumination and Solar Concentration XII - San Diego, United States
Duration: Aug 9 2015Aug 10 2015

Other

OtherNonimaging Optics: Efficient Design for Illumination and Solar Concentration XII
CountryUnited States
CitySan Diego
Period8/9/158/10/15

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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