以正交光學入射方法提升光導耦合效率之研究

The study of orthogonal incidence method for efficient sunlight guiding system

徐運強(Yun-Chiang Hsu)

指導教授 ： 徐巍峰

國立臺北科技大學/電資學院/光電工程系研究所/博士(2013年)

摘要

自然能源隨著環保議題持續加溫，加上全球能源持續短缺的現況下，導入更環保、節能的自然光照明已成為現在最熱門的議題，也是世界的趨勢。而自然光照明系統的主要核心分為三個部分：集光、光引導、光照明。
受惠於太陽能與LED照明的蓬勃發展，許多學者在集光及光照明部分已相當深入的研究，且也有不錯的成果。例如在集光部分有許多Fresnel lens及CPC還有反射式集光等多方面研究，而在照明系統更有許多陣列式鏡頭以及自由取面等特殊需求的照明光學系統，僅有少數人對傳輸光導有更深入的研究，而本論文中利用數值理論的Matlab計算以及LightTools模擬為輔的方法，來設計出高耦合效率的結構。
由於集光器的存在使得光源入射到光導中不再只是單軸的平行光入射，而需要考量各個角度的入射光源，所以本論文提出平行光及正交光源入射的全角度入射數值理論分析，並大幅提高運算的速率，Matlab運算效率為LightTools數十倍。
而在本文所提的非對稱耦合器，考量全方位的入射光源最佳耦合效率可以達到72%為現階段耦合器中效率最高的，且主軸效率可以達到82%。在光源不足需要多分支增加亮度時，我們提出非對稱式的樹支狀耦合結構可明顯的提高光亮度做為自然照明的應用。並可以針對分支入射光做特殊設計使得光源為正交入射，使得分支耦合效率可達100%，以達到最佳耦合效率。

關鍵字

自然光照明 ； 耦合效率 ； 樹支狀光耦合器

並列摘要

The popularity of solar energy source has increased significantly due to the emphasis on world green energy initiatives. Coupled with the world-side energy shortage, no wonder daylighting system is a hot topic on all agendas to migrate to a more environmentally friendly and energy efficient life style. The sunlight collectors, light guides, and light exits that constitute passive daylighting system can be improved using advanced optics.
Most collectors designed for PV cells can also be used in day lighting systems. The concentrating collector, or concentrator, can be equipped with a sun-tracking system to increase the amount of incident sunlight. Sun collectors can be categorized by reflective collectors, CPC practical collectors, refractive collectors and other custom-designed collector.
In this thesis, the theory of the Matlab simulation calculations and supplemented LightTools approach to design a structure of high coupling efficiency. We present parallel and orthogonal light incident on asymmetric light guide wholly theoretical analysis and substantially increase the speed of simulation.
Consider the full range of the incident light source, the coupling efficiency can reach 72% of the present stage of the research the highest coupling efficiency, and the trunk efficiency can reach 82%. In low light when you need to increase the brightness multi-branch, we propose an asymmetric TLGS can significantly improve the brightness as natural lighting applications. It also can be made for special design makes the branch incident light is orthogonal to the incident, so that the coupling efficiency can up to 100%.

並列關鍵字

Natural lighting ； Coupling Efficiency ； Tree-Structured Light Guiding System

參考文獻

44. 沈易達，用於日光傳輸之高傳輸效率光導耦合器的研究與設計，博士學位論文，國立臺北科技大學光電工程系，台北，2013。

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