Design and Evaluation of Uniform LED Illumination Based on Double Linear Fresnel Lenses
| Autor: | Seoyong Shin, Ngoc Hai Vu, Do Thi Gam, Ngoc Minh Kieu, Tran Quoc Tien, Hoang Vu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
non-imaging optics Uniform distribution (continuous) Materials science illumination design light-emitting diodes geometric optical design Radiation 01 natural sciences lcsh:Technology Collimated light law.invention 010309 optics lcsh:Chemistry Optics law 0103 physical sciences General Materials Science Instrumentation lcsh:QH301-705.5 Fluid Flow and Transfer Processes business.industry lcsh:T Process Chemistry and Technology General Engineering Collimator lcsh:QC1-999 Computer Science Applications Lens (optics) LED lamp lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Numerical control business lcsh:Engineering (General). Civil engineering (General) lcsh:Physics 010606 plant biology & botany Light-emitting diode |
| Zdroj: | Applied Sciences Volume 10 Issue 9 Applied Sciences, Vol 10, Iss 3257, p 3257 (2020) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app10093257 |
| Popis: | Redistribution of LED radiation in lighting is necessary in many applications. In this article, we propose a new optical component design for LED lighting to achieve a higher performance. The design consists of a commercial collimator and two linear Fresnel lenses. The LED radiation is collimated by a collimator and redistributed by double linear Fresnel lenses to create a square-shaped, uniform distribution. The linear Fresnel lenses design is based on Snell&rsquo s law and the &ldquo edge-ray principle&rdquo The optical devices are made from poly methyl methacrylate (PMMA) using a high-speed computer numerical control (CNC) machine. The LED prototypes with complementary optics were measured, and the optical intensity distribution was evaluated. The numerical results showed we obtained a free-form lens that produced an illumination uniformity of 78% with an efficiency of 77%. We used the developed LED light sources for field experiments in agricultural lighting. The figures of these tests showed positive effects with control flowering criteria and advantages of harvested products in comparison with the conventional LED sources. This allows our approach in this paper to be considered as an alternative candidate for highly efficient and energy-saving LED lighting applications. |
| Databáze: | OpenAIRE |
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