A novel freeform lens design for collimating UV light emitted from an LED with large divergent angle

Kumar, Himanshu; Velu, Rajkumar; Esakki, Balasubramanian

doi:10.1016/j.ijleo.2018.12.057

Cited by 13 publications

(9 citation statements)

References 13 publications

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“…For these reasons, it is of paramount importance to understand the photon fate in the system for further optimization. To determine which optical losses are present, ray-tracing software such as LightTools®, 76 Matlab®, 77 Ansys Speos®, 78 and ZEMAX Optics Studio® 79 are available today to determine which optical losses are present in the reaction system. Pvtrace, a Python-based statistical photon path tracer, is also an open-source solution for ray-tracing simulations.…”

Section: Computational Tools Towards a Continuous-flow Photoreactor D...mentioning

confidence: 99%

Combining computational fluid dynamics, photon fate simulation and machine learning to optimize continuous-flow photocatalytic systems

et al. 2023

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Section: Computational Tools Towards a Continuous-flow Photoreactor D...mentioning

confidence: 99%

Combining computational fluid dynamics, photon fate simulation and machine learning to optimize continuous-flow photocatalytic systems

et al. 2023

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“…7,8 To solve this issue, researchers have introduced various methods, such as the application of an optical spherical lenses, 9 reflective bowl, 10 total internal reflection lens, 11 and freeform lens. 12 Recently, the reflection concentrator based on a parabolic surface (compound parabolic concentrator) was proposed to collect solar energy and collimate the LED light. 13 However, the high aspect ratio and steep sidewall profile make it difficult to resolve the contradiction between fabrication cost and collimation efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…For years, the illumination system has always been a crucial modified point for optimizing the performance of UVLED-based lithography devices, especially for the improvement of the collimation system due to the Lambert divergence angle of the UVLED directly generating stray light or a ghost image without collimation 7 , 8 . To solve this issue, researchers have introduced various methods, such as the application of an optical spherical lenses, 9 reflective bowl, 10 total internal reflection lens, 11 and freeform lens 12 . Recently, the reflection concentrator based on a parabolic surface (compound parabolic concentrator) was proposed to collect solar energy and collimate the LED light 13 .…”

Section: Introductionmentioning

confidence: 99%

Compact ultraviolet light-emitting diode-based lithography illumination system with tunable coherent factor

Liu

2023

Opt. Eng.

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.Optimization of the illumination system of an ultraviolet light-emitting diode (UVLED)-based lithography system by reducing the system complexity and spatial volume has been a research focus. This work proposes a compact lithography illumination system that applies a specially designed embedded compound parabolic concentrator (ECPC) to replace the traditional collimation module and the zoom lenses module. The ECPC, comprised of two detachable parabolic surfaces, precisely collimates all light beams from the UVLED to a preset divergence angle of 6 deg and provides an adjustable lithography coherent factor. The final illumination system offers a square illumination field with a uniformity of up to 1.3% in the large coherent factor and a linearly adjustable numerical aperture in the range of 0.02 ∼ 0.04. The final exposure result of 0.7 μm based on the experiment setup further verifies the performance of the designed illumination system.

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“…'s method 11 has milestone significance in freeform surfaces, which has been important in the design of LED lenses, such as total internal reflection (TIR) lenses. 12–16 TIR structures can redistribute large-angle light from LEDs, which consist of a single transparent material. Typical TIR structures mainly contain four functional surfaces: total-internal-reflection aspheric surfaces, refraction aspheric surfaces, bottom surfaces and planar surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…Typical TIR structures mainly contain four functional surfaces: total-internal-reflection aspheric surfaces, refraction aspheric surfaces, bottom surfaces and planar surfaces. Therefore, it has been widely applied in beam collimation 13,14 due to the advantages of high efficiency and compactness. TIR lenses can also be used to generate special illumination.…”

Section: Introductionmentioning

confidence: 99%

A design of compound tailored illumination by a total-internal-reflection lens for machine vision

Sun

Zhou

2021

Lighting Research & Technology

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In machine vision systems, the objectives to be detected, such as circuit boards, may be composed of many different materials and shapes, which can lead to highlights, shadows and error information in captured images under traditional uniform illumination. A lighting system that generates tailored irradiance in different regions in machine vision is needed. This paper proposes a design method for an LED lens and obtains special total-internal-reflection (TIR) lenses that generate tailored illumination, which can adapt to the reflectance and shape of a target. Differential-algebraic equations (DAEs) based on the conservation of flux are established to ensure the uniform illumination on the targets, nonlinear equations based on the edge-ray principle are employed to generate the spots with tailored shapes and the numerical solutions can be fitted into the proposed lenses. Six different tailored faculae are generated to verify the proposed method. The results show that the uniformity of tailored facula can exceed 87%, and the light efficiency can exceed 85%. In particular, the contrast of the irradiance among different regions can be adjusted by the boundary conditions; thus, the proposed method can satisfy the complex demand for machine vision and be applied to improve vision detection systems in production lines.

show abstract

A novel freeform lens design for collimating UV light emitted from an LED with large divergent angle

Cited by 13 publications

References 13 publications

Combining computational fluid dynamics, photon fate simulation and machine learning to optimize continuous-flow photocatalytic systems

Combining computational fluid dynamics, photon fate simulation and machine learning to optimize continuous-flow photocatalytic systems

Compact ultraviolet light-emitting diode-based lithography illumination system with tunable coherent factor

A design of compound tailored illumination by a total-internal-reflection lens for machine vision

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