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| Effect of Sampling Interval on the Measurement of the Total Luminous Flux of LED |
| ZHAO Wei-qiang1,LIU Hui1,LIU Jian1,2,YANG Chen-zhu1 |
1. National Institute of Metrology, Beijing 100029, China;
2. Beijing Normal University, Beijing 100875, China |
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Abstract 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%.
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2015, Vol. 36 
