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8 September 2015 Hybrid freeform TIR optics construction in Cartesian coordinate system: a new composite ray mapping method
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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.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Donglin Ma, Zexin Feng, Chengliang Wang, and Rongguang Liang "Hybrid freeform TIR optics construction in Cartesian coordinate system: a new composite ray mapping method", Proc. SPIE 9571, Fourteenth International Conference on Solid State Lighting and LED-based Illumination Systems, 95710H (8 September 2015);


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