Hybrid freeform TIR optics construction in Cartesian coordinate system: A new composite ray mapping method

Donglin Ma, Zexin Feng, Chengliang Wang, Rongguang Liang

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

Abstract

In this paper, we propose a new composite ray mapping method to design freeform total internal reflective (TIR) optics for LED illumination. We sample the ray intensity distribution into rectangular grids which have the best topological match to those rectangular grids on the target surface. With the multiple-to-one mapping relationships between the source intensity distribution and target irradiance distribution, we can construct the freeform TIR surfaces and freeform refractive surface using Snell's law. Compared to our previous design using uv-θφ composite ray mapping method, this design approach is expected to have much less surface error and improve the illumination uniformity further because of the better topological match. In addition, due to the overlapping mechanism by multiple-to-one (composite) ray mapping, the method could lead to a more robust freeform optics compared to traditional freeform optics designs.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE
Volume9571
ISBN (Print)9781628417371
DOIs
StatePublished - 2015
Event14th International Conference on Solid State Lighting and LED-Based Illumination Systems - San Diego, United States
Duration: Aug 12 2015Aug 13 2015

Other

Other14th International Conference on Solid State Lighting and LED-Based Illumination Systems
CountryUnited States
CitySan Diego
Period8/12/158/13/15

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ASJC Scopus subject areas

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

Cite this

Ma, D., Feng, Z., Wang, C., & Liang, R. (2015). Hybrid freeform TIR optics construction in Cartesian coordinate system: A new composite ray mapping method. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 9571). [95710H] SPIE. https://doi.org/10.1117/12.2190759