Filters








156 Hits in 4.8 sec

One-time ray-tracing optimization method and its application to the design of an illuminator for a tube photo-bioreactor

Shu-Chun Chu, Hai-Li Yang, Yi-Hong Liao, Hong-Yu Wu, Chi Wang
2014 Optics Express  
This study details a one-time ray-tracing optimization method for the optimization of LED illumination systems [S.-C. Chu and H.-L.  ...  This method optimizes the performance of illumination systems by modifying the light source's radiant intensity distribution with a freeform lens, instead of modifying the illumination system structure  ...  Council (NSC 102-2112-M-006 −006 -MY3) of Taiwan.  ... 
doi:10.1364/oe.22.005357 pmid:24663876 fatcat:wg6rbqz3q5dunlc6gtiusnauvi

New reversing design method for LED uniform illumination

Kai Wang, Dan Wu, Zong Qin, Fei Chen, Xiaobing Luo, Sheng Liu
2011 Optics Express  
According to this method, two new LED modules integrated with freeform lenses are successfully designed for slim direct-lit LED backlighting with thickness of 10mm, and uniformities of illuminance increase  ...  A new reversing design method is proposed to solve this problem, including design and optimization of LIDC to achieve high uniform illumination and a new algorithm of freeform lens to generate the required  ...  Acknowledgments This work was supported by Nature Science Foundation of China (NSFC) Key Project under grant number 50835005, NSFC Project under grant number 50876038, High Tech Project of Ministry of  ... 
doi:10.1364/oe.19.00a830 pmid:21747552 fatcat:fptumry76veefpggkygyqgsi7i

Overall Illuminance Uniformity of IRED Lighting in Nighttime CCTV

Geon Sa-Gong, Yung-Jun Park, Jung-Je Park, Suho Lee
2017 Transactions on Electrical and Electronic Materials  
Experimental test results showed 0.81 overall illuminance uniformity for rectangular light distribution of LED lights having a radiation angle of 80°.  ...  To obtain uniform illumination over a prescribed rectangular area, a freeform surface lens was evaluated using TracePro.  ...  Consequently the freeform surface lens was designed to optimize its light redistribution to improve its overall illuminance uniformity for commercial LED lighting.  ... 
doi:10.4313/teem.2017.18.1.35 fatcat:soyvbkhnmzdybmvll63bptxhpq

Freeform LED lens for rectangularly prescribed illumination

Kai Wang, Sheng Liu, Fei Chen, Zong Qin, Zongyuan Liu, Xiaobing Luo
2009 Journal of Optics. A, Pure and applied optics  
We introduced a practical design method of compact freeform lens for extended sources used in ASLP.  ...  A new ASLP for road lighting was successfully obtained by integrating a polycarbonate compact freeform lens of small form factor with traditional LED packaging.  ...  In this study we will present a practical design method of compact freeform lens for extended sources, which is quite suitable for designing freeform packaging lenses of new ASLPs.  ... 
doi:10.1088/1464-4258/11/10/105501 fatcat:v4yhah2di5hyvixhmimi5winji

Design of compact freeform lens for application specific light-emitting diode packaging

Kai Wang, Fei Chen, Zongyuan Liu, Xiaobing Luo, Sheng Liu
2010 Optics Express  
We introduced a practical design method of compact freeform lens for extended sources used in ASLP.  ...  A new ASLP for road lighting was successfully obtained by integrating a polycarbonate compact freeform lens of small form factor with traditional LED packaging.  ...  In this study we will present a practical design method of compact freeform lens for extended sources, which is quite suitable for designing freeform packaging lenses of new ASLPs.  ... 
doi:10.1364/oe.18.000413 pmid:20173861 fatcat:ljwqzhnmj5hxvjq43qdu32jua4

Design of a novel freeform lens for LED uniform illumination and conformal phosphor coating

Run Hu, Xiaobing Luo, Huai Zheng, Zong Qin, Zhiqiang Gan, Bulong Wu, Sheng Liu
2012 Optics Express  
In this study, a novel freeform lens was designed for simultaneous realization of LED uniform illumination and conformal phosphor coating.  ...  It is demonstrated that for the LED module with the present freeform lens, the illumination uniformity and ACU was 0.89 and 0.9283, respectively.  ...  The Ministry of Science and Technology of China (2011AA03A109).  ... 
doi:10.1364/oe.20.013727 pmid:22714438 fatcat:vrxkmylzr5ht3orlclqijlja2m

Design Method for a Total Internal Reflection LED Lens with Double Freeform Surfaces for Narrow and Uniform Illumination

Jae Suk Yang, Jae-Hyeung Park, Beom-Hoan O, Se-Geun Park, Seung Gol Lee
2016 Journal of the Optical Society of Korea  
In this paper, we propose a novel differential equation method for designing a total internal reflection (TIR) LED lens with double freeform surfaces.  ...  To validate the proposed method, three TIR LED lenses with beam-spread angles of less than 22.6° have been designed, and their performances evaluated by ray tracing.  ...  Because the condition of minimizing Fresnel loss has been commonly introduced for designing Type II and IV lenses, the total deviation angle of a ray required for uniform illumination is equally distributed  ... 
doi:10.3807/josk.2016.20.5.614 fatcat:gxeyvrvr5rh5nktwoakt433mw4

Effect of manufacturing defects on optical performance of discontinuous freeform lenses

Kai Wang, Sheng Liu, Fei Chen, Zongyuan Liu, Xiaobing Luo
2009 Optics Express  
Discontinuous freeform lens based secondary optics are essential to LED illumination systems.  ...  the uniformity of light pattern, which declined from 0.644 to 0.313.  ...  Based on this method, random shape uniform beam pattern, such as circularity, rectangle, etc., could be designed, especially for the small size light source design cases.  ... 
doi:10.1364/oe.17.005457 pmid:19333312 fatcat:f7ixstoxqnfmdgtjj6ux3hlzeu

Design of a freeform uniformity corrector lens for extended sources in elliptical reflectors

Alois Herkommer, Denise Rausch
2019 Journal of Physics: Photonics  
We show that an analysis of the local mapping of the source to the target radiance distribution allows a profound understanding of the effects and in consequence a design concept for an additional freeform  ...  Illumination design usually requires the collection of a large solid angle of radiation from the light source.  ...  We can deterministically design the shape of the freeform lens by optimizing the full system within any design program to a constant magnification.  ... 
doi:10.1088/2515-7647/ab1b96 fatcat:3zuzsq7wjbgjnpj5q2myau3px4

Optimization of freeform lightpipes for light-emitting-diode projectors

Florian Fournier, Jannick Rolland
2008 Applied Optics  
The optimization process involves a manual study of the trends for different shapes and the use of an optimization algorithm to further improve the performance of the freeform lightpipe.  ...  freeform shapes in terms of transmission efficiency and spatial uniformity.  ...  Optimization of the profile shape can help to improve uniformity for short lengths. B. Optimization of the Profile Shape Model parameterization is critical when dealing with freeform surfaces.  ... 
doi:10.1364/ao.47.000957 pmid:18311267 fatcat:fxcu6b6zrzcovojisj4rk3sp4e

Iterative freeform lens design for prescribed irradiance on curved target

Zexin Feng, 1.Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China, Dewen Cheng, Yongtian Wang, 2.Beijing Key Laboratory of Advanced Optical Remote Sensing Technology, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China.
2020 Opto-Electronic Advances  
The second example shows that our method is also applicable for producing a non-uniform irradiance distribution in a circular region of the undulating surface.  ...  Iterative freeform lens design for prescribed irradiance on curved target. Opto-Electron Adv 3, 200010 (2020).  ...  To verify this method, two freeform-lens designs are demonstrated in Results and discussion Section for producing a rectangular flat-top and a circular non-uniform illumination patterns on a very undulating  ... 
doi:10.29026/oea.2020.200010 fatcat:vpnfyt7cnbdl3iarribpdkg55e

Establishment and Solution for a Mathematical Model of Multiple Diffuse Reflection

zhenmin zhu, Xu Xin, Xiang Sun, Xinyun Wang
2020 IEEE Photonics Journal  
On the basis of the Lambertian characteristic of LEDs and the ideal diffuse surface, a design method that features a multiple diffuse reflectance freeform surface is proposed and its related mathematical  ...  The indirect illumination system with diffuse reflection light-emitting diode (LED) is widely applied in various fields that require high illumination uniformity.  ...  The diffuse reflector freeform lens designed in this work has high illumination uniformity and light output efficiency, thereby providing economic benefits to LED lighting projects.  ... 
doi:10.1109/jphot.2020.3003543 fatcat:t2lquvu7xbeotevkwem25tccfq

Design and analysis of a total-internal-reflection (TIR) structure based on ray-mapping method for tailored illumination

Xiang Sun, Lingbao Kong, Lizhe Qi, Min Xu
2020 IEEE Access  
The results show that the method can generate the tailored illumination, with the uniformity of pattern and background being 95.3% and 89.3%, respectively, while the light efficiency reaches 86.8%.  ...  The irradiance of the pattern is designed to be twice as much as the background, which can be adjusted by the boundary conditions.  ...  The design or optimal of the LED arrays is the one of the common ways to improve the lighting quality, Moreno et al.  ... 
doi:10.1109/access.2020.2978519 fatcat:qzpbnm4iyrbare3ob5apooty6y

Fluorescence Microscopy with Flat Field Illumination using LEDs and Off-The-Shelf Spherical Lenses

Ronian Siew
2021 figshare.com  
The optical design of the illumination system comprises only commercial off-the-shelf spherical lenses.  ...  This is a white paper describing an illumination system design producing uniform flat top illumination at the focal plane (i.e., the same plane) of a microscope objective in a fluorescence microscope.  ...  These properties seem to be just nice for applications involving illumination in the compound microscope, because a microscope's objective lens is often designed to have a circular field of view, and,  ... 
doi:10.6084/m9.figshare.15073053.v1 fatcat:337pc65zl5g2tnc3fjxekavemi

Köhler integrators embedded into illumination optics add functionality

O. Dross, R. Mohedano, M. Hernández, A. Cvetkovic, J. C. Miñano, P. Benítez, Tina E. Kidger, Stuart R. David
2008 Illumination Optics  
The Köhler illumination concept was originally invented to achieve uniform illumination in microscopy 1 .  ...  Currently flat lenslet arrays are widely applied as homogenizing optics 2 for lithography, machine vision illumination, and projection.  ...  However, designing the optics for LEDs to form a clear gradient along the horizon is challenging because LEDs have low luminance (especially when compared with HID lamps) non-uniform illuminance 12 .  ... 
doi:10.1117/12.798111 fatcat:rexyibqrpzcbbnucctikkjsl2u
« Previous Showing results 1 — 15 out of 156 results