Free-form lens for rectangular illumination with the target plane rotating at a certain angle

Liu, Dianhong; Zhang, Xiaohui; Chen, Chen

doi:10.1364/josaa.32.001958

Cited by 7 publications

(6 citation statements)

References 23 publications

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“…Refractive index of material PMMA is 1.4935 without loss. Since an LED source produces a rotationally symmetric Lambertian light distribution, in order to ensure uniformity as much as possible, we take sample β i and γ i based on equivalent-flux division [6], the detail mapping form between β i and γ i is After ray tracing for the lens, we get the illumination distribution at a distance of 4m and angular distribution, as shown in Fig. 7.…”

Section: Resultsmentioning

confidence: 99%

“…If coordinates of point L i+1 are known, then we can obtain coordinates of point L i by (6) According to Eq. (1)- (6), we can get the TIR structure.…”

Section: A New Tir Structure Designmentioning

confidence: 99%

“…Different kinds of methods are proposed to achieve a rectangular beam for an LED [1][2][3][4][5][6][7][8]. Ref.…”

Section: Introductionmentioning

confidence: 99%

“…[7] and is 140° in Ref. [8], and the lighting divergence angle in other methods is large in two perpendicular directions [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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LED Lens for Rectangular Beam with Small Divergence Angles

Liu

Zhang

2016

Journal of the Optical Society of Korea

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We have designed a new TIR(Total Internal Reflection) structure for generating an LED lens which can produce a rectangular beam with small divergence angle in two perpendicular directions for an optical guidance system. The lens can control the divergence angle in the horizontal direction to be a small value of about 8° with a 1 mm × 1 mm LED source, also in the vertical direction it can be about 7°, with optical collection efficiency higher than 0.83. After the lens is manufactured, the work demonstrates that the lens is suitable for an optical guidance system.

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Section: Resultsmentioning

confidence: 99%

“…If coordinates of point L i+1 are known, then we can obtain coordinates of point L i by (6) According to Eq. (1)- (6), we can get the TIR structure.…”

Section: A New Tir Structure Designmentioning

confidence: 99%

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LED Lens for Rectangular Beam with Small Divergence Angles

Liu

Zhang

2016

Journal of the Optical Society of Korea

Self Cite

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“…Equation 8is divided by equation 6; then substituting equation (9) into it, the equation of the two-dimensional curve is obtained…”

Section: Height Distancementioning

confidence: 99%

Design of a combined lens for rectangular illumination

Zhu

Peng

Yuan

2018

Lighting Research & Technology

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Rectangular illumination has found extensive application in the field of LED lighting. In this paper, a design method for a combined lens has used the two characteristics of refraction and diffuse reflection for rectangular illumination. The combined lens is composed of a cutting lens and a pedestal. We determined the cutting lens through the shape of the target plane and then applied diffuse reflection material to the partial surface of the pedestal. The diffuse reflection material is used to improve the lighting efficiency of the target plane. The surface of the pedestal is obtained by lofting from the contour of the cutting lens to the contour of plane where the light source is placed. Based on this method, the combined lens is designed for rectangular illumination. The result shows that the performance of the target plane meets the requirements of rectangular lighting. The uniformity is about 88% and the lighting efficiency is improved to 75%.

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Turbulent Flow Simulation of Bridge Piers and Navigation Safety of Ships in Curved River Sections with Variable Water Level

Tan

Xing

Gao

et al. 2023

Lecture Notes in Civil Engineering

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Some of the bridges across the Yangtze River in the Three Gorges Reservoir area are in the curved section, and the collision prevention of bridges is a hot issue in the current industry. The system of ships sailing across bridges is a complex system in the discipline of transportation engineering. It is affected by ship conditions, channel conditions, meteorology and hydrology, navigation management and human factors. In order to grasp the influence of turbulent flow near the piers of bridges in curved river sections and oblique flow during variable water level periods on ships crossing bridges, it is necessary to carry out numerical simulation analysis. Methods: By establishing a simple physical model of the water area of the bridge pier, the turbulent flow field of the bridge pier was simulated in two dimensions by Fluent software. Then the turbulent flow characteristics of the single pier and the tandem double pier were compared, and the flow velocity on the upstream side of the bridge pier was used as a parameter to carry out numerical simulation. Finally, the flow-induced drift of the ship is quantitatively calculated in combination with the flow velocity. Conclusion: The two-dimensional simulation confirms that the turbulent width of the bridge pier increases with the increase of the flow velocity. The turbulent width of the tandem double pier is larger than that of the single pier, but the vorticity extending downstream is smaller than that of the single pier. The deflection moment and flow-induced drift of the ship crossing the bridge confirm the risk of ship collision. It is necessary to add a multi-function navigation mark to collect water flow parameters in time, and introduce LED visual navigation in the bridge area to improve the reliability of ship navigation in the bridge area of the curved river section.

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Free-form lens for rectangular illumination with the target plane rotating at a certain angle

Cited by 7 publications

References 23 publications

LED Lens for Rectangular Beam with Small Divergence Angles

LED Lens for Rectangular Beam with Small Divergence Angles

Design of a combined lens for rectangular illumination

Turbulent Flow Simulation of Bridge Piers and Navigation Safety of Ships in Curved River Sections with Variable Water Level

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