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Vol. 32, No. 8(2), S&M2292

ISSN (print) 0914-4935
ISSN (online) 2435-0869
Sensors and Materials
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Sensors and Materials, Volume 32, Number 6(3) (2020)
Copyright(C) MYU K.K.
pp. 2177-2185
S&M2249 Research Paper of Special Issue
Published: June 30, 2020

Design of LED Free-form Lens for Sensor Systems [PDF]

Chi-Feng Lin, Yu-Bin Fang, and Wei-Chih Su

(Received April 12, 2019; Accepted May 1, 2020)

Keywords: LED, sensor system, optical lens

Free-form lenses are commonly used for controlling the ray direction of LEDs, particularly when a uniform lighting distribution for sensor applications is required. We propose a target grid modification (TGM) method based on Snell’s law, the edge ray principle, and a luminous flux mapping technique to facilitate the design of an LED free-form lens with uniform illuminance properties over a rectangular area. In the proposed method, the size of grids on the target plane is adjusted adaptively in such a way as to improve the uniformity of the illuminance distribution. It is shown that for a given illumination specification, the optimal parameters applied in the TGM method can be easily determined using a pattern search algorithm. The validity of the proposed approach is demonstrated both numerically and experimentally. The results show that the TGM method improves the illuminance uniformity from 50 to 86% and yields an LED output efficiency of 90% given a rectangular target plane with dimensions of 2000 × 750 mm2 and a lens-to-target plane distance of 500 mm.

Corresponding author: Chi-Feng Lin

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Cite this article
Chi-Feng Lin, Yu-Bin Fang, and Wei-Chih Su, Design of LED Free-form Lens for Sensor Systems , Sens. Mater., Vol. 32, No. 6, 2020, p. 2177-2185.

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