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Hierarchical-genetic-algorithm-based design of a large scale Fresnel lens for a reading light system with multiple LED sources

机译:基于分层遗传算法的大型菲涅耳透镜设计,用于具有多个LED光源的阅读灯系统

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摘要

A conventional Fresnel lens is suitable to be used in the reading light system due to its features of directing and collecting light rays, as well as its properties of being essentially flat, plastic, lightweight, and cost efficient. However, it is not suitable for a reading light system with multiple light sources. To a reading light system with multiple light sources, a Fresnel lens with suitably designed groove angles can be used to improve the performance of that system in both illuminance and uniformity. Nevertheless, suitable groove angles are rather difficult to find if a Fresnel lens consists of a lot of groove angles and each angle covers a wide range of degrees. We develop a hierarchical genetic algorithm (HGA) to search for a set of optimal groove angles to design a Fresnel lens for a reading light system with multiple light sources from an enormous searching space. In addition, the groove angles of the Fresnel lens are directly derived from a conventional Fresnel lens database. The design goal is to maximize the illuminance and simultaneously maintain the uniformity of light rays incident to a specified reading surface. As a result, we can demonstrate that a HGA really works better than a genetic algorithm and the optimally designed Fresnel lens, indeed, offers a better light-guiding performance than a conventional Fresnel lens for a multiple-LED reading light system.
机译:常规的菲涅耳透镜由于其引导和收集光线的特征以及其基本平坦,塑料,轻便和经济的特性而适合在阅读灯系统中使用。但是,它不适用于具有多个光源的阅读灯系统。对于具有多个光源的阅读灯系统,可以使用具有适当设计的凹槽角的菲涅耳透镜来提高该系统在照度和均匀性方面的性能。然而,如果菲涅耳透镜由很多凹槽角组成并且每个角度覆盖很大的角度范围,则很难找到合适的凹槽角。我们开发了一种层次遗传算法(HGA),以搜索一组最佳凹槽角,从而为来自巨大搜索空间的具有多个光源的阅读灯系统设计菲涅尔透镜。另外,菲涅耳透镜的凹槽角直接从常规菲涅耳透镜数据库导出。设计目标是最大化照度并同时保持入射到指定读取表面的光线的均匀性。结果,我们可以证明,HGA确实比遗传算法工作得更好,并且经过优化设计的菲涅耳透镜确实为多LED阅读灯系统提供了比传统菲涅耳透镜更好的导光性能。

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