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Optical Engineering

Reflector design for large-size spherical surface sources
Author(s): Liangliang Cao; Yanjun Han; Zexin Feng; Yi Luo
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Paper 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.

Paper Details

Date Published: 1 February 2011
PDF: 6 pages
Opt. Eng. 50(2) 023001 doi: 10.1117/1.3541803
Published in: Optical Engineering Volume 50, Issue 2
Show Author Affiliations
Liangliang Cao, Tsinghua Univ. (China)
Yanjun Han, Tsinghua Univ. (China)
Zexin Feng, Tsinghua Univ. (China)
Yi Luo, Tsinghua Univ. (China)

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