Toleranced freeform optical design with extended sources using ray targeting

Richard John Koshel, Steve Mulder

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Freeform optics are limited to design with simplified source models. With a realistic extended source, the resulting design is limited by the ability to hold the source and optic to the desired tolerances. For example, a design is made around the nominal emitter characteristics, such as an encapsulated LED die. This process is called tailoring. Positioning and spectral output can vary appreciably for these emitters. A method to design optics with extended sources with tolerances taken into account is presented. This method uses targeted ray tracing to specify particular points on optical surfaces. In the method presented here, the source is represented instead as a collection of non-ideal sources, each weighted according to the statistics of the dimensional and color variations that are expected in the source. The design is iteratively developed over its extent where each step accounts for the multitude of tolerances potential ray paths through the optics. The end result is to design optics that are tolerant to the predicted level of error, while maintaining the desired level of efficiency and distribution at the target. This method notably samples the differential étendue aspects of the source as it propagates through the system. Upon solution of the iteratively generated reflector control points, an optimization run can be performed to improve performance. We present a wall-wash example to illustrate the method.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume8842
DOIs
StatePublished - 2013
Event16th Conference of Novel Optical Systems Design and Optimization - San Diego, CA, United States
Duration: Aug 26 2013Aug 28 2013

Other

Other16th Conference of Novel Optical Systems Design and Optimization
CountryUnited States
CitySan Diego, CA
Period8/26/138/28/13

Fingerprint

Optical design
Optical Design
Half line
rays
Optics
optics
Tolerance
emitters
Ray tracing
Light emitting diodes
Ray Tracing
Control Points
Reflector
ray tracing
Statistics
positioning
Positioning
reflectors
Color
Categorical or nominal

Keywords

  • Differential étendue
  • Extended source
  • Freeform
  • LED
  • Tailoring
  • Targeted ray
  • Tolerancing

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Koshel, R. J., & Mulder, S. (2013). Toleranced freeform optical design with extended sources using ray targeting. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 8842). [88420L] https://doi.org/10.1117/12.2024969

Toleranced freeform optical design with extended sources using ray targeting. / Koshel, Richard John; Mulder, Steve.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8842 2013. 88420L.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Koshel, RJ & Mulder, S 2013, Toleranced freeform optical design with extended sources using ray targeting. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 8842, 88420L, 16th Conference of Novel Optical Systems Design and Optimization, San Diego, CA, United States, 8/26/13. https://doi.org/10.1117/12.2024969
Koshel RJ, Mulder S. Toleranced freeform optical design with extended sources using ray targeting. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8842. 2013. 88420L https://doi.org/10.1117/12.2024969
Koshel, Richard John ; Mulder, Steve. / Toleranced freeform optical design with extended sources using ray targeting. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8842 2013.
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