Laser & Optoelectronics Progress, Volume. 50, Issue 9, 92203(2013)
Design for Freeform Surface Lens of LED Lighting System
By the example of designing freeform lens based on LED light source to achieve uniform circular spot, a new method of establishing optical device model is proposed. According to geometrical optics and non-imaging optics theory, the mathematical model of lens is derived. Numerical calculation of lens surface data is obtained by Matlab, and by TracePro programming the lens modeling is completed, then a conversation between Matlab and TracePro is created with the dynamic data exchange (DDE) protocol. In TracePro, the lens model is automatically created. The ray-tracing simulation results reveal that, the circular spot with the radius of 3 m on the target placed 5 m away is achieved by a LED Lambertian light source which has the luminous flux of 100 lm, size of 1 mm×1 mm and a viewing angle of 120°. The uniformity of illumination reaches 0.7, and the lens efficiency can reach 87%. This method can simplify the design process and save time compared with conventional methods of lens entity model, which further proves its accuracy and reliability.
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Liang Lijun, Niu Pingjuan, Xing Haiying. Design for Freeform Surface Lens of LED Lighting System[J]. Laser & Optoelectronics Progress, 2013, 50(9): 92203
Category: Optical Design and Fabrication
Received: May. 16, 2013
Accepted: --
Published Online: Aug. 8, 2013
The Author Email: Lijun Liang (lianglijunzpp1005@163.com)