Compound Parabolic Concentrator-Simultaneously Multiple Surface Method for Rectangualar Optical Design in 3D Space
Liang Xue
Wang Sai
Pang Yufeng
Abstract：In order to achieve the rectangular irradiance distribution of LED lambertian source , a simultaneously multiple surface nonimaging optical design method is put forward which is called the “spine-rib” method.First it shrinks the divergence of the lambertian source from ±90°to 45°by a CPC, and then a couple of “spine” line is generated according to the prescribed irradiance distribution .Based on these lines there will be “rib” lines grown on to both side to get two surface frameworks .Finally, two freeform surfaces of the optical device are built by NURBS surface algorithm .The introduction of two freeform surfaces enhances the degrees of freedom which also improves the difficulty of design .Applied the method to the rectangular uniform light distribution design , simulation results show that : a square contour will be formed on the far -field receiver and give a 3.66°ray half divergence angle .When the reflection loss is fully considered , the light energy utilization is still more than 63%, the flat-topped uniformity is higher than 0.96.
Keywords：geometric opticsnonimaging optics3D-SMS methods
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 83-88 )