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Proceedings Paper

Efficient measurement of large light source near-field color and luminance distributions for optical design and simulation
Author(s): Hubert Kostal; Douglas Kreysar; Ronald Rykowski
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Paper Abstract

The color and luminance distributions of large light sources are difficult to measure because of the size of the source and the physical space required for the measurement. We describe a method for the measurement of large light sources in a limited space that efficiently overcomes the physical limitations of traditional far-field measurement techniques. This method uses a calibrated, high dynamic range imaging colorimeter and a goniometric system to move the light source through an automated measurement sequence in the imaging colorimeter's field-of-view. The measurement is performed from within the near-field of the light source, enabling a compact measurement set-up. This method generates a detailed near-field color and luminance distribution model that can be directly converted to ray sets for optical design and that can be extrapolated to far-field distributions for illumination design. The measurements obtained show excellent correlation to traditional imaging colorimeter and photogoniometer measurement methods. The near-field goniometer approach that we describe is broadly applicable to general lighting systems, can be deployed in a compact laboratory space, and provides full near-field data for optical design and simulation.

Paper Details

Date Published: 21 August 2009
PDF: 9 pages
Proc. SPIE 7429, Novel Optical Systems Design and Optimization XII, 742908 (21 August 2009); doi: 10.1117/12.826261
Show Author Affiliations
Hubert Kostal, Radiant Imaging, Inc. (United States)
Douglas Kreysar, Radiant Imaging, Inc. (United States)
Ronald Rykowski, Radiant Imaging, Inc. (United States)

Published in SPIE Proceedings Vol. 7429:
Novel Optical Systems Design and Optimization XII
R. John Koshel; G. Groot Gregory, Editor(s)

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