Reflector design for large-size spherical surface sources

Liangliang Cao*, Yanjun Han, Zexin Feng, Yi Luo

*Corresponding author for this work

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Abstract

We propose a novel method for designing reflectors with large-size spherical surface sources. The center portion of the reflector is designed using the edge-ray principle, while the rim portion is designed based on the variable-separation mapping method. Step discontinuities are introduced during rim surface construction to control the deviation caused by error in normal vectors, and a feedback modification is adopted to compensate for the illuminance deviation produced by the large size of sources. As an example, a streetlamp with a desired rectangular illuminance distribution on the road is designed using a spherical surface source (10 cm diam) and a compact reflector. It has an illuminance uniformity of 60.2% and utilance of 66.9%, considerably improved from the traditional values of 35 and 40%, respectively.

Original languageEnglish
Article number023001
JournalOptical Engineering
Volume50
Issue number2
DOIs
Publication statusPublished - Feb 2011
Externally publishedYes

Keywords

  • reflector design
  • spherical surface sources

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Cao, L., Han, Y., Feng, Z., & Luo, Y. (2011). Reflector design for large-size spherical surface sources. Optical Engineering, 50(2), Article 023001. https://doi.org/10.1117/1.3541803