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

Donglin Ma; Zexin Feng; Chengliang Wang; Rongguang Liang

doi:10.1117/12.2190759

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

Donglin Ma, Zexin Feng, Chengliang Wang, Rongguang Liang

Optical Sciences, College of

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English (US)
Title of host publication	Proceedings of SPIE - The International Society for Optical Engineering
Publisher	SPIE
Volume	9571
ISBN (Print)	9781628417371
DOIs	https://doi.org/10.1117/12.2190759
State	Published - 2015
Event	14th International Conference on Solid State Lighting and LED-Based Illumination Systems - San Diego, United States Duration: Aug 12 2015 → Aug 13 2015

Other

Other	14th International Conference on Solid State Lighting and LED-Based Illumination Systems
Country	United States
City	San Diego
Period	8/12/15 → 8/13/15

ASJC Scopus subject areas

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

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10.1117/12.2190759

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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, 14th International Conference on Solid State Lighting and LED-Based Illumination Systems, San Diego, United States, 8/12/15. https://doi.org/10.1117/12.2190759

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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.",

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N2 - 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.

AB - 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.

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