基于不同高度LED泛光灯实现相同照明效果的二次非球面透镜设计

本文针对不同安装高度的150WLED泛光灯二次透镜进行研究，实现了在不改变灯具与LED光源条件下，仅通过更换LED二次透镜并调整安装高度便可得到相同均匀的照明效果。使用光学设计软件LightTools设计了发光角度分别为60°、90°、120°的三款LED泛光灯的非球面透镜，选取20m×20m的地面作为接收面，分别对发光角度为60°的泛光灯安装高度在12m～22m，90°的泛光灯安装高度在10m～20m，以及120°的泛光灯安装高度在8m～18m的不同条件下进行仿真模拟实验，研究表明，当60°泛光灯安装在19m，90°泛光灯安装在15m，120°泛光灯安装在10m时，得到了中心照度分别为24．31x、24．61x、25．41x，和平均照度分别为16．61x、15．91x、17．21x的仿真结果。为了对仿真结果进行进一步验证，分别制作了60°和120°两款LED二次非球面透镜实物样品，并对其光学性能进行检测并与仿真数据进行对比分析，结果显示，二者的中心照度分别相差2．61x、2．21x，平均照度分别相差1．41x、0．61x。与仿真结果基本一致。该设计使得LED泛光灯在改变使用场所或使用目的时，不需改变整体照明系统，只通过更换LED泛光灯的二次非球面透镜便可得到相同的照明效果，大大地降低了照明器材的安装费用，从而节省了生产成本，获得了更大的生产效益。

Development of Secondary Aspheric Lens with Same Intensity of Illumination According to the Installation Height of LED Floodlight

Abstract： This paper studied the secondary lens of LED which can cover the same distributional area of illumination with the change of lens according to the height of 150-watt LED floodlight, with no changes of light luminaires and LED light source. Three types of aspheric lens for 60°, 90° and 120° irritation angle LED floodlights were designed by LightTools. The simulation experiments of the various irritation angle LED floodlights （60°, 90° and 120°） mounted at various height （12m-22m, 10m ° 20m and 10m- 20m） were done. In the experiments, the ground with the area of 20m X 20m was selectived as the receiving surface. The simulation results showed that, the central illumination （24.31x, 24.61x and 25.41x） and the average illumination （16.61x, 15.91x and 17.21x） were obtained when the various LED floodlights （60°, 90°and 120°） were mounted at the various height （19m, 15m and 10 m） , respectively. Finally, the samples of 60° and 120° LED floodlights with LED secondary aspherie lens based on the previous data were prepared for the further experiments. On the optical property detection and the simulate data comparativeanalysis, the central illumination deviation were 2. 61x and 2.21x, the average illumination deviation were 1.41x, 0.61x. The data between simulation and sample was similar. By this study and the application of the developed LED secondary lens, secondary lens of LED which can cover the same distributional area of illumination with the changes of lens according to the height of LED floodlight, without changes of light luminaires and LED light source. Therefore, it can be assumed that it will contribute to the decrease in the installation expense of luminaires and the production cost.