Research On The Key Technology Of The Sun-Tracking And Light-guide System

Solar energy has been considered as the most ideal, secure, environmentally-friendly energy. As a renewable resource, it is clean, environmental-friendly, and recyclable comparing with the fossil energy. In recent years, solar energy has been developed and utilized worldwidely. One way of using solar energy is sunlight illumination. Although sunlight illumination technology has already been researched extensively, the application of this technology is expensive and low-efficient. All of these posed to be a barrier for the commercialization of this technology. Therefore, it is important to develop cheap, efficient, and stable sunlight illumination system that is suitable for utilization in china.In this article, the sun tracking and light-guide system technologies are studied. Based on solar tracking, sunlight collection, and indoor lighting technologies, a set of indoor lighting system, which can track the sun automatically, has been made. This system can light the house by tracking the sun, concentrating and transmitting the sunlight.In order to improve the utilization of sunlight, a set of dual-axis tracking platform and automatic tracking control system have been designed, which can make sure that tracking platform can achieve the maximum light intensity all the time. Throught coupling the concentrated sunlight into fiber and emitted it into indoors, it can accordingly realize the conversion of the daylight to indoor lighting.The sun tracking and illumination system is composed of condenser device, light-guide device, two-dimensional tracking platform, micro control system, fiber, and stepping motor. In this system, the condenser is made of six Fresnel lens to realize the concentration of the sunlight, and the micro-controller is employed to control the rotary direction and angle of this two-dimensional tracking platform. Then, the concentrated sunlight is transmitted by two types of fiber (quartz fiber and glass fiber). At last, light power and transmission efficiency are measured and analyzed by experiments, and the results show that this system has reasonable precision, good stability and high coupling efficiency.