标题： 腔体对光源出射度的影响 显示英文标题

标题： The effects of cavity on the etendue of a light source

摘要： 模拟表明，围绕圆形光源的圆柱形腔体可以在不改变发射能量和光源尺寸的情况下减小发散角。 这一结果可以提供一种方法，通过在腔体内使用无损耗的散射表面对光线进行随机化，从而减小光源的光束亮度。 实验表明，围绕表面光源的金属腔体可以减小发散角。 然而，金属表面也会吸收相当大一部分的光能。 侧壁表面的朗伯特性将光线的方向改变为水平方向。 这增加了腔体内的反射次数，并放大了单次反射中的少量吸收。 腔体对光源光束亮度的影响有助于在各种照明应用中提供更多的设计灵活性。 显示英文摘要

摘要： The simulation proposes that the cylindrical cavity around a circular light source can decreases the divergence angle without changing the emission energy and source size. This result can provide a way to reduce the etendue of the light source by scrambling the rays inside the cavity with a lossless scattering surface. The experiment demonstrates that the metallic cavity around the surface source reduces the divergence angle. However, the metallic surface also absorbs quite a large portion of the light energy. The Lambertian nature of the sidewall surface changes the directions of the rays into horizontal directions. It increases the number of reflection inside the cavity and amplifies the small amount of absorption at a single reflection. The effect of the cavity on the etendue of the light source can contributes to providing more design flexibility in various lighting applications.