利用计算机仿真LED单管球面空间各点照度值的方法,模拟了分布光度计标定4种典型LED单管总光通量值的过程,利用计算结果分析了分布光度计测量所采用的不同采样间隔对标定结果的系统误差。这4种LED单管的光强分布曲线分别为准朗伯、长茄形、双翼形和窄光束,涉及轴对称或非轴对称光强分布。计算结果显示,对于常见的LED单管光源,利用分布光度计采用2°等间隔法,在球带份数m值大于12的情况下,采样间隔选择所带来的系统偏差可控制在0.3%以内。

With the computer to simulate LED spatial illuminance distribution and LEDs total luminous flux measurement process of a goniophotometer,showing the effect of different sampling interval on the measuring of four types of LEDs,whose intensity spatial distribution curves are of quasi-Lambert,tomato,double-wings,and narrow beam respectively. Axial or non-axial symmetric types are both considered. The calculation results show that,for common LED light source,a usage is recommended with a 2° interval and amount of sections greater than 12. The systematic error of sampling interval with a goniophotometer can be controlled within 0.3%.