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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 20 — Oct. 7, 2013
  • pp: 24099–24111

Simulating the spatial luminance distribution of planar light sources by sampling of ray files

Jan Audenaert, Guy Durinck, Frédéric Bernard Leloup, Geert Deconinck, and Peter Hanselaer  »View Author Affiliations

Optics Express, Vol. 21, Issue 20, pp. 24099-24111 (2013)

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Ray files offer a very accurate description of the optical characteristics of a light source. This is essential whenever optical components are positioned in close proximity (near-field) of the light source in order to perform accurate ray tracing simulations. However, a ray file does not allow for a direct simulation of the spatial luminance distribution, i.e. luminance map, by off-the-shelf ray tracers. Simulating luminance maps of light sources or luminaires is especially important in general lighting in order to predict their general perception when viewed by the observer, and more specific, the perception of glare of luminaires having a non-uniform luminance distribution. To enable the simulation of luminance maps while maintaining the high accuracy offered by a ray file, a sampling method is presented. To validate the approach, near-field goniophotometer measurements of two planar light sources were performed. From these measurement data, ray files were extracted to which the sampling method was applied in order to obtain a set of surface sources. This approach was validated by comparing measured luminance images with simulated luminance images. A good agreement was found, validating the presented method.

© 2013 Optical Society of America

OCIS Codes
(120.5240) Instrumentation, measurement, and metrology : Photometry
(080.4298) Geometric optics : Nonimaging optics

ToC Category:
Geometric Optics

Original Manuscript: August 13, 2013
Revised Manuscript: September 20, 2013
Manuscript Accepted: September 23, 2013
Published: October 1, 2013

Jan Audenaert, Guy Durinck, Frédéric Bernard Leloup, Geert Deconinck, and Peter Hanselaer, "Simulating the spatial luminance distribution of planar light sources by sampling of ray files," Opt. Express 21, 24099-24111 (2013)

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