Irradiance tailoring for extended sources using a point-source freeform design algorithms
Irradiance tailoring for extended sources using a point-source freeform design algorithms
复制标题
使用点源自由形状设计算法对扩展源进行辐照度定制
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
P. Loosen
中科院分区：
文献类型：
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作者：
R. Wester;A. Bruneton;A. Bäuerle;J. Stollenwerk;P. Loosen
高效高功率 LED 光源的出现和快速发展及其独特的发射特性使得照明系统的开发能够满足有关光分布和效率的非常严格的要求。大多数用于设计必要的光学自由曲面的算法都依赖于点源假设。只要 LED 和这些表面之间的距离足够大，这就是一个很好的近似值。另一个重要的设计目标是使光学元件尽可能小，这使得点源假设不太准确。因此，现有的设计算法必须辅以处理有限尺寸 LED 光源的方法。我们研究了由光源的有限尺寸所设定的限制，并提出了优化光学自由曲面以满足这些限制的算法。点光源结果经过迭代改进，以使用有限尺寸的 LED 获得所需的照明图案。在每个迭代步骤中，点源计算中使用的照明图案都会进行调整，以便 LED 的实际照明图案接近最初所需的图案。
The advent and rapid development of efficient high power LED sources with their unique emission characteristics enables the development of illumination systems that meet very strict requirements concerning light distribution and efficiency. Most of the algorithms used to design the necessary optical freeform surfaces rely on the point source assumption. As long as the distance between LED and those surfaces is sufficiently large, this is a good approximation. One further important design goal is to make the optical components as small as possible, which makes the point source assumption less accurate. The existing design algorithms thus have to be accompanied by methods to treat the finite-sized LED sources. We examine the limits that are set by the finite size of the light sources and present algorithms to optimize optical freeform surfaces up to these limits. Point source results are iteratively improved to get the desired illumination pattern employing finite sized LEDs. At each iteration step the illumination pattern used in the point source computations is adapted so that the real illumination pattern of an LED approximates the originally desired pattern.