Optical design of rectangular illumination with freeform lenses for the application of LED road lighting

doi:10.1007/s12200-017-0707-7

Front. Optoelectron.

2017, Vol. 10

Issue (4) : 353-362 https://doi.org/10.1007/s12200-017-0707-7

RESEARCH ARTICLE

Optical design of rectangular illumination with freeform lenses for the application of LED road lighting

Chunyun XU^1,^2,³, Haobo CHENG^2,³(

), Yunpeng FENG^2,³

¹. China Aerospace Academy of Systems Science and Engineering, Beijing 100048, China
². Joint Research Center for Optomechatronics Engineering, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China
³. Shenzhen Research Institute, Beijing Institute of Technology, Shenzhen 518057, China

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Abstract

We present a freeform lens for application to light-emitting diodes (LED) road lighting. We propose a simple source–target luminous intensity mapping method based on Snell’s law and geometric-optics analysis. We calculated different contours of cross-sections to construct a freeform lens with a smooth surface. The computer simulation results show that the lighting performance of a single freeform lens is not sufficient for road lighting. For the road lamp simulation, we adopted an oval arrangement of freeform lenses on a printed circuit board. In addition, we performed tolerance analysis to determine the tolerance limits of manufacturing and installation errors. A road lamp at a height of 12 m can create rectangular illumination with an area of 40 m × 12 m, 69.7% uniformity, and average illuminance of 24.6 lux. This lighting performance can fully comply with the urban road lighting design standard.

Keywords light-emitting diodes (LED) nonimaging optics freeform lens design rectangular illumination

Corresponding Author(s): Haobo CHENG

Just Accepted Date: 10 August 2017 Online First Date: 26 September 2017 Issue Date: 21 December 2017

Cite this article:

Chunyun XU,Haobo CHENG,Yunpeng FENG. Optical design of rectangular illumination with freeform lenses for the application of LED road lighting[J]. Front. Optoelectron., 2017, 10(4): 353-362.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-017-0707-7
https://academic.hep.com.cn/foe/EN/Y2017/V10/I4/353

Fig.1 Geometric-optics relation of refractive freeform surface

Fig.2 Construction of 2D contour of freeform surface

Fig.3 Freeform surface for cross-section A-A

Fig.4 Freeform surface for cross-section B-B

Fig.5 Cross sections corresponding to cross-section A-A with different angles

Fig.6 Position of the light rays of the lens in the direction of different cross-sections

Fig.7 Two-dimensional freeform counters of cross-sections A-A and B-B

Tab.1 Parameters of different cross-sections

Fig.8 Two-dimensional contours of different cross-sections

Fig.9 Three-dimensional entity model of the freeform lens

Fig.10 Influence of LED chip size on the uniformity and the efficiency of the lens

Fig.11 Ray tracing of the freeform lens

Fig.12 Simulation of a single freeform lens. (a) Illuminance distribution at 12 m distance; (b) polar candela intensity distribution curve

Fig.13 Freeform lens arrangement on the PCB

Fig.14 Simulation of road lamp. (a) Illuminance distribution at 12 m distance; (b) polar candela intensity distribution curve

Fig.15 Horizontal deviation of the LED for (a) cross-section A-A, and (b) cross-section B-B

Fig.16 Vertical deviation of the LED

Fig.17 Tilt deviation of the LED for (a) cross-section A-A, and (b) cross-section B-B

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