针对现有LED光源建模适用条件及可靠性不确定性的问题, 对紧凑型LED配光设计中光源建模可靠性进行了研究.通过优化设计具有不同透镜光源直径比模型的方法, 对点光源、表面光源、ray文件光源三种建模方式在系统中的差异进行分析对比.整体设计以ray文件光源模型为基准, 以常规紧凑型全反射式透镜为二次配光元件, 对不同透镜光源直径比(光束角分别为±15°、±10°、±5°)的光学系统进行优化设计和分析计算.结果表明: 在能量利用率误差为±2%的范围内, 光束角为±15°, 透镜光源直径比大于36∶2时, 表面光源建模可代替ray文件光源建模；光束角±10°, 透镜光源直径比为44∶2时, 表面光源建模可代替ray光源建模；光束角为±5°, 透镜光源直径比为82∶2时, 表面光源建模可代替ray文件光源建模.但是在±2%误差范围内, 点光源无论在何种透镜光源直径比, 任何光束角下均不能代替ray文件光源.这一结果为紧凑型系统设计中光源模拟提供了依据, 同时解决了采用ray文件光源建模进行辅助优化设计耗时较长的问题, 为相关研究提供了参照依据.

To overcome disadvantages of modeling application and uncertainties of the reliabilities of the existing LED light source model and others, the reliability of light source modeling was studied for distribution design on compact LED. By optimizing different models with different lens and LED diameters ratio, the difference of three modeling methods including point light source model, surface light source model and ray-file light source model in the system was compared and analyzed. Taking the ray-file light model as the standard, an optimal design and analysis computation of the optical element were carried out when the beam angle was ±15°, ±10°, ±5° for different lens and LED diameter ratio, by choosing the conventional compact total-reflection lens as the second optical element and using three modeling methods including point light source model, surface light source model and ray-file light source model. Experimental results indicate that surface light model can take place of the ray-file light model when the deviation of utilization of energy is within ±2%, the beam angle is ±15° meanwhile lens and LED diameter ratio is more than 36∶2. It happens too when the beam angle is ±10° while the lens and LED diameter is 44∶2. In the case that the beam angle is ±5°, and the lens and LED diameter ratio is 82∶2, the ray-file light source model can also be taked place by the surface light source model. However, the ray-file light source model cannot be replaced by the point light source model in any case when the deviation range falls into ±2%. The results provide basis for the system design and solve the problem of time wasting of assisting optimal design by using ray light source model, which will be of great benefit to the future research.