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Analysis of far-field distance of LED arrays based on an improved error calculation formula
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Paper Abstract

If a surface light source is in far-field working condition, the error from using the inverse-square law about intensity and distance should be less than 1%. However, the results of where the far-field begin may be quite different with different error definition. In this paper, by comparing several formulas commonly used for error analysis, the root mean square (RMS) weighted by the sum of intensity at infinity is proposed as the preferred error formula for far-field distances calculation. The relative far-field distances (RFFDs) for LED arrays with different radiation pattern are calculated based on this error definition.

Paper Details

Date Published: 18 September 2013
PDF: 8 pages
Proc. SPIE 8834, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration X, 88340R (18 September 2013); doi: 10.1117/12.2022417
Show Author Affiliations
Wentao Cai, Chongqing Univ. (China)
Xianming Liu, Chongqing Univ. (China)
Peng Zhang, Chongqing Univ. (China)
Weimin Chen, Chongqing Univ. (China)

Published in SPIE Proceedings Vol. 8834:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration X
Roland Winston; Jeffrey Gordon, Editor(s)

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