Light Management

Optimizing spherical light-emitting diode array for highly uniform illumination distribution by employing genetic algorithm

[+] Author Affiliations
Yanxia Shen

Jiangnan University, School of Internet of Things Engineering, Wuxi 214122, China

Zhicheng Ji

Jiangnan University, School of Internet of Things Engineering, Wuxi 214122, China

Zhouping Su

Jiangnan University, School of Science, Wuxi 214122, China

J. Photon. Energy. 3(1), 034594 (Oct 17, 2013). doi:10.1117/1.JPE.3.034594
History: Received December 31, 2012; Revised May 21, 2013; Accepted August 30, 2013
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Abstract.  A numerical optimization method (genetic algorithm) is employed to design the spherical light-emitting diode (LED) array for highly uniform illumination distribution. An evaluation function related to the nonuniformity is constructed for the numerical optimization. With the minimum of evaluation function, the LED array produces the best uniformity. The genetic algorithm is used to seek the minimum of evaluation function. By this method, we design two LED arrays. In one case, LEDs are positioned symmetrically on the sphere and the illuminated target surface is a plane. However, in the other case, LEDs are positioned nonsymmetrically with a spherical target surface. Both the symmetrical and nonsymmetrical spherical LED arrays generate good uniform illumination distribution with calculated nonuniformities of 6 and 8%, respectively.

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© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

Yanxia Shen ; Zhicheng Ji and Zhouping Su
"Optimizing spherical light-emitting diode array for highly uniform illumination distribution by employing genetic algorithm", J. Photon. Energy. 3(1), 034594 (Oct 17, 2013). ; http://dx.doi.org/10.1117/1.JPE.3.034594


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