Free-form reflector optimization for general lighting

Zhang, Wenzi; Liu, Qinxiao; Gao, Huifang; Yu, Feihong

doi:10.1117/1.3430576

Cited by 19 publications

(6 citation statements)

References 12 publications

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“…Given the theory in Section 3 the Monte Carlo method is employed to simulate the point source and the extended source, and the illumination E i, j x, y ð Þ and E 0 i, j x, y ð Þ is the initial value for two sources, respectively. According to the results, a feedback function is formed, which is introduced as follows [12][13][14][17][18][19][20][21][22][23] :…”

Section: Design Of the Feedback Methodsmentioning

confidence: 99%

Design of a freeform reflector for LED sources based on a feedback method

Luo

Zhang

et al. 2014

Lighting Research & Technology

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We propose a method for the design of a freeform reflector by means of feedback methods to create light-emitting diode (LED) sources with uniform illuminance. A reflector is first designed to obtain a uniform circular light distribution for a point source. Then the optical performance of the reflector is investigated for both the point sources and extended sources based on a Monte Carlo ray tracing method. Comparing the illumination differences, a new reflector is generated by adding feedback. Repeated iterations of feedback can improve the reflector performance. To validate the method, a reflector is designed for an extended LED source. The results demonstrate that the illuminance uniformity can reach 88% and system efficiency can reach 97.4% simultaneously, after six feedback cycles. These are certainly able to meet the needs of general lighting applications.

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Section: Design Of the Feedback Methodsmentioning

confidence: 99%

Design of a freeform reflector for LED sources based on a feedback method

Luo

Zhang

et al. 2014

Lighting Research & Technology

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“…One advantage is that the design efficiency is significantly improved in the feedback design. Unlike the optimization design which usually requires an excessive number of iterations to converge (e.g., 100 iterations), the feedback design usually takes only a few iterations. The other advantage is that a larger number of data points can be used in the feedback design to construct the freeform surfaces which could yield a better control on light propagation and generate complicated designs .…”

Section: Algorithms For Extended Light Sourcesmentioning

confidence: 99%

Design of Freeform Illumination Optics

Feng

Zheng

et al. 2018

Laser & Photonics Reviews

130

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Freeform optics constitutes a new technology that is currently driving substantial changes in illumination design. It liberates designers and engineers from restrictions of optical surface geometry, enabling them to achieve compact, lightweight, and efficient illumination systems with excellent optical performance. Freeform optics is currently used widely for both fundamental research and practical applications. This Review focuses on the design of freeform illumination optics, which is a key factor in advancing the development of illumination engineering. The design methods of freeform illumination optics can be divided into two groups: zero‐étendue algorithms based on ideal source assumption and design algorithms for extended light sources. The zero‐étendue algorithms include ray mapping method, Monge–Ampère equation method, and supporting quadric method. The algorithms for extended sources include illumination optimization, feedback design, and simultaneous multiple surfaces method. The characteristics and limitations of these design methods are illustrated and a summary of these methods with future outlooks is also given.

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“…Traditionally, optical elements of quadric surfaces are used to achieve this goal. 4–9 However, progress in society today is towards intelligence, controllability and miniaturisation. The conventional optical system requires large calculations to achieve the light distribution and a complicated combination of optical components.…”

Section: Introductionmentioning

confidence: 99%

A Fresnel freeform surface collimating lens for LEDs

Zhu

et al. 2017

Lighting Research & Technology

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This paper proposes a freeform surface lens design based on the Fresnel model to achieve a compact structure and good collimation. A simulation indicates the lens enjoys an efficiency as high as 88.43% within a half view angle of 2° for 1 × 1 mm2 size LED. This paper makes a comparison of three types of lens, among which the Fresnel freeform lens achieves the best performance when the LED size is smaller than 2.5 × 2.5 mm2. The influence of the LED size and the manufacturing tolerances are discussed.

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Free-form reflector optimization for general lighting

Cited by 19 publications

References 12 publications

Design of a freeform reflector for LED sources based on a feedback method

Design of a freeform reflector for LED sources based on a feedback method

Design of Freeform Illumination Optics

A Fresnel freeform surface collimating lens for LEDs

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