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Memorias de investigación
Communications at congresses:
Efficient color mixing through étendue conservation using freeform optics
Year:2015
Research Areas
  • Engineering
Information
Abstract
Today?s SSL illumination market shows a clear trend towards high flux packages with higher efficiency and higher Color Rendering Index, realized by means of multiple color chips and phosphors. Such light sources require the optics to provide both near- and far-field color mixing. This design problem is particularly challenging for collimated luminaries, since traditional diffusers cannot be employed without enlarging the exit aperture and reducing brightness. Furthermore, diffusers compromise the light output ratio (efficiency) of the lamps to which they are applied. A solution, based on Köhler integration, consisting of a spherical cap comprising spherical microlenses on both its interior and exterior sides was presented in 2012. The diameter of this so-called Shell-Mixer was 3 times that of the chip-array footprint. This work shows a new version of the Shell-Mixer, based on the Edge Ray Principle and conservation of étendue, where neither the overall shape of the optic nor the surfaces of the lenses are constrained to spheres or rotational Cartesian ovals. The new shell is freeform, only twice as large as the chip-array footprint and equals the original model in terms of color uniformity, brightness and efficiency.
International
Si
Congress
Efficient Design for Illumination and Solar Concentration XII . Nonimaging Optics
960
Place
Reviewers
Si
ISBN/ISSN
9781628417388
Start Date
09/08/2015
End Date
13/08/2015
From page
1
To page
9
Nonimaging Optics. Proc. SPIE 9572
Participants
  • Autor: Maikel Hernández Sanz (UPM)
  • Autor: Pablo Benitez Gimenez (UPM)
  • Autor: Juan Carlos Miñano Dominguez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Ingeniería Óptica
  • Departamento: Electrónica Física
  • Centro o Instituto I+D+i: Centro de Domótica Integral, CEDINT
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