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Proceedings Paper

A generalized approach to modeling radiation pattern measurement methods for high-power LEDs
Author(s): Gao-Wei Chang; Chia-Cheng Liao; Yung-Chang Chen
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Paper Abstract

The rapid growth of high-power light-emitting diode (LED) technologies has gained momentum in developing accurate tools and methods to measure performances of such products. For instance, it is widely recognized that confirming the photobiological safety is extremely important since the light of the high-power products may be shone directly into people's eyes. For many years, the international standard organizations, such as CIE, and researchers have been developing guidelines and/or improving methods for measuring the LED radiation patterns, respectively. However, the difficulties in LED measurements have been still highlighted by discrepancies in the experimental results among different laboratories. In this paper, we first propose a mathematical formulation for the existing approaches, such as those using two- and three-dimensional goniometers. Then, generalization of the measurement methods is presented to improve the system measurement accuracy, through making a connection between a predicted accuracy and the parameters of the optical setups (such as aperture size and working distance). To verify the effectiveness of our approach, the experiments are conducted to evaluate and compare the performances of the proposed approach. The measurement results indicate that our approach is consistent from theory to practice.

Paper Details

Date Published: 14 May 2010
PDF: 10 pages
Proc. SPIE 7717, Optical Modelling and Design, 77171F (14 May 2010); doi: 10.1117/12.854194
Show Author Affiliations
Gao-Wei Chang, National Taiwan Normal Univ. (Taiwan)
Chia-Cheng Liao, National Taiwan Normal Univ. (Taiwan)
National Tsing Hua Univ. (Taiwan)
Yung-Chang Chen, National Tsing Hua Univ. (Taiwan)

Published in SPIE Proceedings Vol. 7717:
Optical Modelling and Design
Frank Wyrowski; John T. Sheridan; Jani Tervo; Youri Meuret, Editor(s)

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