The evaluation of uncertainty about the shape of aperture on measurement of averaged LED intensity

Jian Liu; Hui Liu; Wei-qiang Zhao; Cheng Li; Xiao-ying Zhang; Bao-zhou Zhang

doi:10.1117/12.2247219

19 October 2016 The evaluation of uncertainty about the shape of aperture on measurement of averaged LED intensity

Jian Liu, Hui Liu, Wei-qiang Zhao, Cheng Li, Xiao-ying Zhang, Bao-zhou Zhang

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

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.

Citation Download Citation

Jian Liu, Hui Liu, Wei-qiang Zhao, Cheng Li, Xiao-ying Zhang, and 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); https://doi.org/10.1117/12.2247219

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available