Precise optical modeling for LED lighting verified by cross correlation in the midfield region

Sun, Ching Cherng; Lee, Tsung Xian; Ma, Shih‐Hsin; Lee, Ya Luan; Huang, Shih Ming

doi:10.1364/ol.31.002193

Cited by 161 publications

(95 citation statements)

References 7 publications

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“…The illuminator in the RICE is a Nichia LED, with part number NESWC04T as described in Ref. 10. The number of rays that are emitted from each LED is set to 1,000,000, and the total flux is 100 mW.…”

Section: Definition Of Uniformity Of Light In Ricementioning

confidence: 99%

“…In recent years, C. C. Sun considered the importance of the midfield region, which is between the near-field and far-field regions; in this region, the propagation of light varies with distance, normally within 1 cm to 1 m. 11,12 This case applies in RICE because the distance from the LED to the image plane is only a few centimeters. Experiments were carried out to verify the accuracy of the simulation.…”

Section: Definition Of Uniformity Of Light In Ricementioning

confidence: 99%

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Improving the uniformity of luminous system in radial imaging capsule endoscope system

Ou-Yang

Jeng

2013

Opt. Eng

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Abstract. This study concerns the illumination system in a radial imaging capsule endoscope (RICE). Uniformly illuminating the object is difficult because the intensity of the light from the light emitting diodes (LEDs) varies with angular displacement. When light is emitted from the surface of the LED, it first encounters the cone mirror, from which it is reflected, before directly passing through the lenses and complementary metal oxide semiconductor (CMOS) sensor. The light that is strongly reflected from the transparent view window (TVW) propagates again to the cone mirror, to be reflected and to pass through the lenses and CMOS sensor. The above two phenomena cause overblooming on the image plane. Overblooming causes nonuniform illumination on the image plane and consequently reduced image quality. In this work, optical design software was utilized to construct a photometric model for the optimal design of the LED illumination system. Based on the original RICE model, this paper proposes an optimal design to improve the uniformity of the illumination. The illumination uniformity in the RICE is increased from its original value of 0.128 to 0.69, greatly improving light uniformity. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Definition Of Uniformity Of Light In Ricementioning

confidence: 99%

Section: Definition Of Uniformity Of Light In Ricementioning

confidence: 99%

Improving the uniformity of luminous system in radial imaging capsule endoscope system

Ou-Yang

Jeng

2013

Opt. Eng

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“…Our phosphor particle model was designed to simulate the scattering and absorbing process of light inside the phosphors. This model was based on the Mie theory, the ray tracing method, and Monte-Carlo algorithms [8][9][10][11]. A blue light LED was used to excite the phosphors, with the samples numbered R-645 and R-626 indicating red lights, G-531 and G-529 indicating green lights, and Y-561 yellow light.…”

Section: Introductionmentioning

confidence: 99%

Optical Modeling Analysis of Red, Green, and Yellow Phosphors with a Blue LED

Sun

Tien

2018

Advances in Condensed Matter Physics

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The luminous properties of red, green, and yellow phosphors with a blue LED are evaluated and a corresponding optical model is constructed using the optical simulation software LightTools5. According to the phosphor particle model, the desired chromaticity coordinate of the multicomponent light which is excited by a blue LED can be achieved by modifying the weight concentration of the phosphors. A comparison of the four types of LED package modules tested shows that the yellow phosphor encapsulated with a semispherical module takes up a lesser percentage of the total weight percentage of a constructed white light with a correlated color temperature of around 4000 K. The simulation and experimental results provide a cross-reference for better packaging and encapsulating designs for lumen improvement.

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“…Currently, the optical design of LEDs is carried out by means of Monte Carlo ray tracing methods. [1][2][3][4][5] These techniques randomly simulate from 1 to 10 million light rays and the output ray-density distribution serves as an indirect value for the radiated pattern. In addition to the time consumed by these techniques, the lack of an analytic expression for the output intensity and irradiance reduces the optimization process to a trial and error procedure.…”

Section: Introductionmentioning

confidence: 99%

Spatial distribution of LED radiation

Moreno

2007

SPIE Proceedings

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The remarkable properties of light-emitting diodes (LEDs) make them ideal sources for many applications ranging from indicator lights, optical communication systems, and displays to solid-state lighting. In this paper a radiometric approach to realistically model the intensity spatial distribution of encapsulated LEDs is presented. We provide an analytical relationship between the radiated pattern and the main LED parameters (chip, encapsulant, and reflector).

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Precise optical modeling for LED lighting verified by cross correlation in the midfield region

Cited by 161 publications

References 7 publications

Improving the uniformity of luminous system in radial imaging capsule endoscope system

Improving the uniformity of luminous system in radial imaging capsule endoscope system

Optical Modeling Analysis of Red, Green, and Yellow Phosphors with a Blue LED

Spatial distribution of LED radiation

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