Observatorio de I+D+i UPM

Memorias de investigación
Conferences:
Inhomogeneous source uniformization using a shell mixer Köhler integrator
Year:2012
Research Areas
  • Engineering
Information
Abstract
High flux and high CRI may be achieved by combining different chips and/or phosphors. This, however, results in inhomogeneous sources that, when combined with collimating optics, typically produce patterns with undesired artifacts. These may be a combination of spatial, angular or color non-uniformities. In order to avoid these effects, there is a need to mix the light source, both spatially and angularly. Diffusers can achieve this effect, but they also increase the etendue (and reduce the brightness) of the resulting source, leading to optical systems of increased size and wider emission angles. The shell mixer is an optic comprised of many lenses on a shell covering the source. These lenses perform Kohler integration to mix the emitted light, both spatially and angularly. Placing it on top of a multi-chip Lambertian light source, the result is a highly homogeneous virtual source (i.e, spatially and angularly mixed), also Lambertian, which is located in the same position with essentially the same size (so the average brightness is not increased). This virtual light source can then be collimated using another optic, resulting in a homogeneous pattern without color separation. Experimental measurements have shown optical efficiency of the shell of 94%, and highly homogeneous angular intensity distribution of collimated beams, in good agreement with the ray-tracing simulations.
International
Si
0819493023
Entity
Optical Design and Engineering V (Conference OSD01) Optical System Design 2012 Procc. SPIE Vol. 8550
Entity Nationality
Sin nacionalidad
Place
Barcelona, España
Participants
  • Autor: Julio Chaves (LPI)
  • Autor: Aleksandra Cvetkovic . (UPM)
  • Autor: Rubén Mohedano (LPI)
  • Autor: Oliver Dross (Philips Research)
  • Autor: Maikel Hernández Sanz (UPM)
  • Autor: Pablo Benitez Gimenez (UPM)
  • Autor: Juan Carlos Miñano Dominguez (UPM)
  • Autor: Juan Vilaplana (LPI)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Ingeniería Óptica
  • Centro o Instituto I+D+i: Centro de Domótica Integral, CEDINT
  • Departamento: Electrónica Física
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