Design of Diffuse Reflection Freeform Surface for Uniform Illumination

Author

Zhen-min Zhu ; Xiao-Long Jin ; Hui Yang ; Lu-Sheng Zhong

Author_Institution

Sch. of Electr. & Electron. Eng., East China Jiao Tong Univ., Nanchang, China

Volume

10

Issue

1

fYear

2014

fDate

Jan. 2014

Firstpage

7

Lastpage

12

Abstract

Indirect illumination with light-emitting diodes (LEDs) and diffusers is widely applied in various fields that require uniform illumination. In this paper, a design of diffuse reflection freeform surface is proposed. Based on the Lambertian characteristic of LEDs and ideal diffuse surface, a mathematical model is developed. Nonlinear algebraic equations are established by redistributing the energy emitted from LEDs to the illuminated scene for uniform illumination. Solving these equations numerically, the outline of the diffuse surface is obtained. Finally, by using ray tracing software TracePro, the simulation result shows that the irradiance uniformity of the detection plane is above 95% with high accepted tolerance.

Keywords

LED lamps; algebra; lighting; nonlinear equations; optical design techniques; optical elements; ray tracing; Lambertian LED characteristic; TracePro ray tracing software; diffuse reflection freeform surface; energy emission redistribution; indirect illumination; light emitting diode; nonlinear algebraic equation; uniform illumination; Equations; Light emitting diodes; Lighting; Mathematical model; Optical surface waves; Reflection; Simulation; Diffuse reflection; freeform surface; light-emitting diode (LED); uniform illumination;

fLanguage

English

Journal_Title

Display Technology, Journal of

Publisher

ieee

ISSN

1551-319X

Type

jour

DOI

10.1109/JDT.2013.2273073

Filename

6560402