Paper Info
Title
Ray targeting for optimizing smooth freeform surfaces for LED non-rotational illumination
Abstract
We propose an effective optimization method for generating smooth freeform surfaces for light-emitting diode (LED) non-rotational illumination based on ray targeting. This method begins with a starting design and goes through two optimization steps. An initial estimate is determined using a partial differential equation (PDE) method and a variable separation mapping. In the first optimization step the merit function is developed with ray targeting to ensure the shape of the illumination pattern. The purpose of the second optimization is to further improve the optical performance by constructing the merit function with uniformity and efficiency. Smooth freeform reflective and refractive surfaces, which can produce a uniform rectangular illumination without rotational symmetry, are designed using this method. The results show that uniform rectangular illumination is achieved and that smooth freeform surfaces are obtained. With ray targeting, the design efficiency can be significantly enhanced, and excellent optical performance can be achieved.
Year
DOI
Venue
2013
10.1631/jzus.C1300032
Journal of Zhejiang University SCIENCE C
Keywords
Field
DocType
Illumination design, Freeform surface, Non-imaging optics, Computation methods, O43
Rotational symmetry,Control theory,Computer science,Diode,Refraction,Optics,Merit function,Partial differential equation
Journal
Volume
Issue
ISSN
14
10
1869-196X
Citations 
PageRank 
References 
1
0.43
0
Authors
11
Name
Order
Citations
PageRank
rengmao120.87
rengmao220.87
Peng Liu351.84
Peng Liu451.84
yaqin520.87
yaqin620.87
Zhen-Rong Zheng731.98
Zhen-Rong Zheng831.98
Hai-Feng Li931.98
Hai-Feng Li1031.98
X.L. Liu111111.83