19 October 2016 The evaluation of uncertainty about the shape of aperture on measurement of averaged LED intensity
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Proceedings Volume 10155, Optical Measurement Technology and Instrumentation; 101552U (2016) https://doi.org/10.1117/12.2247219
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China
Averaged LED Intensity was defined in CIE 127, in which two measurement conditions were proposed, both required the area of entrance aperture to be 100 mm2. The CIE 127 LED measurement method is widely accepted. Circular entrance aperture is usually used in commercial photometers, but the photosurface of silicon photodetector is square. However, when LEDs with a narrow beam angle are measured their Averaged LED Intensity, the result may vary due to various aperture shapes. In this paper, a mathematical measurement model is built, then the uncertainty of measurement introduced by shape of aperture is rigorously evaluated by comparing the prediction of model and the results obtained from measurement experiments. It is an effective quantitative analysis to the impact of aperture shapes on accurate measurement of Averaged LED Intensity.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jian Liu, Jian Liu, Hui Liu, Hui Liu, Wei-qiang Zhao, Wei-qiang Zhao, Cheng Li, Cheng Li, Xiao-ying Zhang, Xiao-ying Zhang, Bao-zhou Zhang, Bao-zhou Zhang, } "The evaluation of uncertainty about the shape of aperture on measurement of averaged LED intensity", Proc. SPIE 10155, Optical Measurement Technology and Instrumentation, 101552U (19 October 2016); doi: 10.1117/12.2247219; https://doi.org/10.1117/12.2247219


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