Rapid modeling method of LED free-form surface lens based on Scheme language
-
摘要: 传统的自由曲面透镜建模通常需要多个软件共同协作完成,其建模过程繁琐,且由于不同软件之间的不兼容会导致模型在导入光学仿真软件时出现微小形变。提出一种在光学仿真软件中利用Scheme语言直接进行快速建模的LED自由曲面透镜建模方法。根据光源辐射特性和需要实现的照明面上的能量分布,采用划分网格法,利用Snell方程和能量守恒定律, 沿经纬方向分别迭代求解, 在得到自由曲面各节点坐标后,分别采用3D建模软件和Scheme语言编程构建透镜模型。通过光学仿真软件,模拟计算了100万条光线,直径1mm的光源在距离地面10 m、面积为40 m10 m的照明区域内的照度分布。结果表明:利用Scheme语言在光学仿真软件中直接快速建模避免了模型从3D软件导入光学仿真软件时产生的微小形变从而使光照均匀度由67%提升到93.5%。同时Scheme语言编程建模仅需5 s,建模速度远高于3D建模软件。Abstract: Multiple softwares were required in the traditional design process of LED free-form surface lens. It is obvious that this process is complicated and inefficient. Moreover, when the model was transferred from 3D modeling software to optical simulation software, the file format had to be changed to solve the problem of the software compatibility. Note that some subtle changes were inevitably introduced to the model by such an operation, such as the generation of cracks or tiny deformation which would seriously affect the light efficiency and the degree of illumination uniformity. A new design method was presented in this paper which was used to directly generate model in the optical simulation software by using Scheme language. In this paper, the method of mesh division was applied to design the LED free-form surface lens with rectangular lighting. After the corresponding surface configuration was obtained, 3D modeling software and the Scheme language programming were used to generate lens model respectively. With the help of optical simulation software, a light source with the size of 1 mm in diameter was used in experiment, in which total one million rays were computed. The simulated results could be acquired by both models. It can be seen that the model deformation problems caused by the process of the model transfer could be prevented by using Scheme language, and the degree of illumination uniformity was also increased from 67% to 93.5%. Meanwhile, only 5 seconds were needed in modeling process by Scheme language which was more efficient than 3D modeling software.
-
Key words:
- Scheme language /
- LED road lighting /
- rapid modeling /
- free-form surface /
- secondary optics
-
[1] Lai Liping, Zhuang Qiren, Liu Shiwei, et al. Design if freeform lens for uniform illumination on panel of LED fat light[J]. Infrared and Laser Engineering, 2015, 44(2): 561-566. (in Chinese) [2] [3] [4] Lin Chifeng, Fang Yubin, Chen Taoshing. Design of optical lens for LED road lighting[C]//SPIE, 2012, 8484: 848413, 1. [5] Hu Xiaojia, Qian Keyuan. Optimal design of optical system for LED road lighting with high illuminance and luminance uniformity[J]. Appl Opt, 2013, 52(24): 5888-5893. [6] [7] [8] Tu Dawei, Wu Rengmao, Yang Hengliang, et al. Effect of optical structure on output light intensity distribution in LED package[J]. Optics and Precision Engineering, 2008, 16(5): 832-838. (in Chinese) [9] [10] Wang Wei. Study on the design method of uniform illumination based on transmitted free-form surface theory[D]. Hangzhou: Zhejiang University, 2006. (in Chinese) [11] [12] Roland Winston, Juan C Minano, Pablo Benitez. Nonimaging Optics[M]. Burlington: Elsevier Academic Press, 2005: 43-67. [13] [14] Bortz J, Shatz N, Pitou D. Optimal design of a nonimaging projection lens for use with an LED source and a rectangular target[C]//Proc. SPIE, 2000, 4092: 130-138. [15] Li Baicheng, Zhang Dawei, Huang Yuanshen, et al. A new structure of multi-layer phosphor pachage of white LED with high efficiency[J]. Chinese Optics Letters, 2010, 8(2): 221-223.(in Chinese) [16] [17] Parkyn B, Pelka D. Free-form illumination lens designed by a pseudo-rectangular lawnmower algorithm[C]//SPIE, 2005, 6338: 633808.1-7. [18] [19] [20] Ries H, Muschaweck J. Tailoring freeform lenses for illumination[C]//SPIE, 2001, 4442: 43-50. [21] [22] Wang Hong, Chen Zanji, Wu Heng, et al. Design method of LED headlamp freeform optical lens[J]. Infrared and Laser Engineering, 2014, 43(5): 1529-1534. (in Chinese) [23] Jacobson B, Gengelbach R. Lens for uniform LED illumination: an example of automated optimization using Monte Carlo ray tracing of an LED source[C]//SPIE, 2002, 4446: 130-138. [24] [25] [26] Yin Shaoyun, Wang Zhongxun, Sun Xiuhui, et al. Design of Freeform LED Lens with Large Light Deflection Angle for Road Lighting Application[C]//SPIE, 2012, 8560: 85600E, 1-7. [27] [28] Ding Yi, Zheng Zhenrong, Gu Peifu. Freeform LED lens for uniform illumination[J]. Opt Express, 2008, 16(17): 12958-12966. (in Chinese) [29] Kent Dybvig R. The Scheme Programming Language Fourth Edition[M]. US: The MIT Press, 2009. -
点击查看大图
计量
- 文章访问数: 420
- HTML全文浏览量: 71
- PDF下载量: 144
- 被引次数: 0
下载:
