7 September 2017 Numerical analysis of lateral illumination lightpipes using elliptical grooves
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Abstract
Lightpipes are used for illumination in applications such as back-lighting or solar cell concentrators due to the high irradiance uniformity, but its optimal design requires several parameters. This work presents a procedure to design a square lightpipe to control the light-extraction on its lateral face using commercial LEDs placed symmetrically in the lightpipe frontal face. We propose the use of grooves using total internal reflection placed successively in the same face of extraction to control the area of emission. The LED area of emission is small compared with the illuminated area, and, as expected, the lateral face total power is attenuated. These grooves reduce the optical elements in the system and can control areas of illumination. A mathematical and numerical analysis are presented to determine the dependencies on the light-extraction.
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Guillermo E. Sánchez-Guerrero, Perla M. Viera-González, Edgar Martínez-Guerra, Daniel E. Ceballos-Herrera, "Numerical analysis of lateral illumination lightpipes using elliptical grooves", Proc. SPIE 10379, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XIV, 103790S (7 September 2017); doi: 10.1117/12.2273096; https://doi.org/10.1117/12.2273096
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