基于LightTools的大口径积分球辐射特性仿真

Radiometric characteristics simulation of large aperture integrating sphere bosed on LightTools

为了研制辐射特性相对理想的大口径积分球,采用LightTools仿真分析了5种光源位置和3种照明模式,共15种直径为3 m积分球模型的辐照度面均匀性和朗伯特性。相比依靠经验设计积分球,计算机仿真研究具有周期短、成本低、重复性高等优点。仿真结果表明:照明模式和光源位置对积分球开口处辐照度面均匀性影响很小;而对开口处朗伯特性产生较大影响。首先,光源方向上的朗伯特性最差,其次,对称式照明模式则会改善朗伯特性,另外,随着光源与积分球前后半球交汇面的距离不断增加,积分球的朗伯特性逐步变优。最后,测试了直径为3 m积分球在不同照明模式下的辐照度面均匀性、光源方向和垂直方向的朗伯特性,实测辐射特性与仿真结果相吻合。

In order to develop the large aperture integrating sphere with perfect radiometric characteristics, 15 integrating sphere models with 5 different lamp positions and 3 different illumination models were built and simulated by LightTools, and their irradiance plan uniformity and Lambert characteristic were analyzed. Compared with designing by experience, computer simulation has the advantage of short period, low cost and good repeatability. Simulation results indicate that lamp positions and illumination models have less effect on irradiance plan uniformity, however have more effect on Lambert characteristic. The Lambert characteristic of lamp direction is worse than other directions, symmetrical illumination model improves the Lambert characteristic, and the Lambert characteristic usually becomes better with the distance between the light source and the joint plan of both hemispheres increasing. The irradiance plan uniformity, the Lambert characteristic of light source＇s direction and the Lambert characteristic of light source＇s vertical direction of a 3 m integrating sphere were tested, with different illumination models, and the measured performance agreed well with simulation results.