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Proceedings Paper

The evaluation of uncertainty about the shape of aperture on measurement of averaged LED intensity
Author(s): Jian Liu; Hui Liu; Wei-qiang Zhao; Cheng Li; Xiao-ying Zhang; Bao-zhou Zhang
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Paper Abstract

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.

Paper Details

Date Published: 19 October 2016
PDF: 6 pages
Proc. SPIE 10155, Optical Measurement Technology and Instrumentation, 101552U (19 October 2016); doi: 10.1117/12.2247219
Show Author Affiliations
Jian Liu, National Institute of Metrology (China)
Hui Liu, National Institute of Metrology (China)
Wei-qiang Zhao, National Institute of Metrology (China)
Cheng Li, Longxin Technology Packing Co., Ltd. (China)
Xiao-ying Zhang, Shanxi Institute of Metrology Science (China)
Bao-zhou Zhang, Beijing Normal Univ. (China)

Published in SPIE Proceedings Vol. 10155:
Optical Measurement Technology and Instrumentation
Sen Han; JiuBin Tan, Editor(s)

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