测量距离对发光二极管平均发光强度的影响  

Impact of Distance between Detector and LED on Measurement of Averaged LED Intensity

作　　者：刘建[1] 刘慧[1] 赵伟强[1] 张保洲[2] 

机构地区：[1]中国计量科学研究院,北京100029 [2]北京师范大学天文系,北京100875

出　　处：《光学学报》2015年第9期143-147,共5页Acta Optica Sinica

基　　金：中国计量科学研究院基本业务费(23-AKY1318)

摘　　要：国际照明委员会的CIE 127号文件专门针对发光二极管(LED)的光辐射测量方法给出了A、B两个测量"LED平均发光强度"的条件,并得到世界同行的普遍认可。然而,实验测量中发现同一只LED管在不同的测量条件下的平均发光强度相差悬殊,甚至有LED管在A、B两个不同条件下的平均发光强度测量值相差近10%,严重影响了LED光度量值的准确评价。对LED光强空间分布数学建模的分析,通过计算以及实验验证表明将测量角定为0.5°,测量距离变为645 mm,能够将LED光强空间分布不均匀对LED平均发光强度测量的距离影响减小到0.5%以下,从而保证LED平均发光强度量值的一致性。Commission International de Illumination （CIE） publishes ＇ CIE 127 technical report＇ （CIE 127） for light emitting diode（LED） measurement. Two different conditions （condition A and condition B） for measurement of averaged LED Intensityare proposed in CIE 127,and the LED measurement method gradually win the worldwide recognition.Most of the LED has a different averaged LED intensity in these two measurement conditions, and the difference is up to 1095 in some LED measurements, so it is difficult to evaluate the averaged LED intensity accurately. Mathematical models for different kinds of luminous intensity distribution have been created according to a large amount of measurement data. Simulation results and measurement results make clear that the impact of strong directional luminous intensity distribution can be reduced to less than 0.5% when distance between detector and LED is up to 645 mm, and the equivalent full plane angle is approximately 0.5°, this work makes the value of averaged LED intensity have consistency widely.

关 键 词：测量 光度计量 LED平均发光强度 测量距离 

分 类 号：O432[机械工程—光学工程]