| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 104 === Nowadays, global warming has become a major issue. Reducing the consumption of fossil fuel and saving energy were the top priorities. In response to the energy crisis, renewable energy has been widely taken as other energy options. Solar energy is one of the most essential and abundant energy. If we can collect and transmit natural light into buildings without opto-electronic conversion, that will save energy and provide healthier light into our daily life. Therefore, our team designed a series of products known as Natural Light Illumination System (NLIS). In developing the high-quality NLIS, our primary concern was to increase the efficiency of the system. When the concentrators in daylight system collects sunlight, the light transmits through light pipe or fiber to any room you want. However, the efficiency decreases dramatically as the number of concentrator increases, due to the interconnection parts which encounter huge loss.
In this paper, we present a free-form collimator applied to the outputs of LightBricks. The collimator is composed of different microlenses, which are derived from geometric optics, and include free-form refractive surfaces and total internal reflective surfaces. By mesh generation method, we successfully compress the collimator’s volume and the computer simulation results show that a ratio of luminous flux within ±25° and the total flux within ±90° on the collimator's output has a dramatically decrease, and the collimator with the best performance has a ratio of luminous flux within ±1° and the total flux within ±90° at 79%. Also it has an optical efficiency of 64%.
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