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Optimal design of Fresnel lens for a reading light system with multiple light sources using three-layered Hierarchical Genetic Algorithm

机译:基于三层递阶遗传算法的多光源阅读灯系统菲涅尔透镜的优化设计

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摘要

A typical Fresnel lens is not suitable to a reading light system with multiple light sources since it is designed in such a way that each groove is at a slightly different angle from the next but with the same focal length. Therefore, a Fresnel lens with suitably designed groove angles is needed for this kind of light system. In this paper, a more efficient three-layered Hierarchical Genetic Algorithm (3LHGA) is proposed to find an optimal set of groove angles for a designed Fresnel lens to optimize both the illuminace and uniformity for a reading light system with multiple light sources. The groove angles of a designed Fresnel lens are directly derived from a Fresnel lens database by two layers of control genes in the proposed 3LHGA. The proposed 3LHGA not only makes it possible to evolve a lot of groove angles as parametric genes but also further improve the performance of a Fresnel lens and increase the speed of evolution. From the simulation results we can demonstrate that the designed Fresnel lens indeed offers improvement of light-guiding performance for a multiple-LED reading light system.
机译:典型的菲涅耳透镜不适用于具有多个光源的阅读灯系统,因为它的设计方式是,每个凹槽与下一个凹槽的角度略有不同,但焦距相同。因此,对于这种光系统,需要具有适当设计的槽角的菲涅耳透镜。在本文中,提出了一种更有效的三层层次遗传算法(3LHGA),以为设计的菲涅耳透镜找到最佳的凹槽角集,以优化具有多个光源的阅读灯系统的照度和均匀性。所设计的菲涅耳透镜的凹槽角是通过所提出的3LHGA中的两层控制基因直接从菲涅耳透镜数据库导出的。提出的3LHGA不仅可以使许多凹槽角作为参数基因进化,而且还可以进一步改善菲涅耳透镜的性能并提高进化速度。从仿真结果可以证明,设计的菲涅耳透镜确实可以改善多LED阅读灯系统的导光性能。

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