| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 105 === In order to reduce the carbon dioxide emissions and reduce the level of global warming, renewable energy has become the development trend in which solar energy is inexhaustible. if the energy can be used not only save energy but also reduce carbon it will bring huge business opportunities. Therefore, National Taiwan University of Science and Technology Photonic Systems Simulation Design laboratory, PSSDL researches the sun into the indoor illumination for many years so that people will be able to enjoy healthy sunshine in the room and it can promote people's vitamin D and keep healthy both mentally and physically.
Natural light illumination system is divided into four subsystems: pre-collecting, collecting, transmitting and irradiating. The pre-collecting track the sun which into the collecting system through the collecting system collects the next level of transmitting system and irradiating for indoor illumination. Due to the collecting system will continue reflection and refraction at interior cause scattered light as well as make the overall efficiency of the Natural Light Illumination System(NLIS) is not very well.
In this paper, we design method of a free-form collimator is proposed. After Fresnel depletion, the strongest and sub-strong energy is selected. The collimator is designed by using the programmed grid cutting method and selecting complex light source is collimated by the slope of light spot with Cubic spline curve fitting also improve previously the efficiency of Natural light illumination system. Taking the freeform collimator of the 18496(1362) cutting grid as an example, the efficiency is 39.15% below 100 meters and compared to commercially available plastic fiber of PMMA materials, is up to about 39.08%.
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