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25 March 2013 Modular design optical light pipe with high efficiency
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The best benefit of Natural Light Illumination System (NLIS®) is to reduce energy consumption that compare to traditional lighting system. However, the propagation efficiency will decrease dramatically when there is the long distance propagation in NLIS®. Therefore, this paper has proposed an innovative modulated guiding structure with high propagation efficiency. The base structure is consisting of two Fresnel lenses and the distance between two lenses is two times of focal length. Furthermore, the light will be focused by first Fresnel lens and diverge as original input again before the second lens due to two times of focal length design. The advantage of the innovative design is to avoid energy loss when propagation. Based on two times of focal length design method and connecting several base structures in the way of cascading, it could make the structure become modulated. The efficiency of a base module structure will reach above 80%. We have proposed an innovative modeled structure that is with high propagation efficiency. By the Fresnel lens, the structure has the benefit of low cost and easy to produce that compare to traditional natural light system.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Allen Jong-Woei Whang, Yi-Hsin Yeh, and Yi-Yung Chen "Modular design optical light pipe with high efficiency", Proc. SPIE 8620, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices II, 86201U (25 March 2013);


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