| The solar tower plant is one of the important ways of using solar energy. The same as any other technologies,the solar tower technology has many problems to be solved despites its obvious advantage.How to improve the solar tracking precision of a heliostat is one of such problems. Various solutions,which can be generally divided into two categories according to the strategies(such as using image processing or employing photoelectric detection) it employs,have been presented in order to solve such a problem.The solution presented in this paper is based on photoelectric detection.The solution is a kind of photoelectric detection system which uses positon sensitive detector as photo sensor and a piece of AT89S52 as its information processing unit.The light spot position of the incident laser beam on the surface of the PSD,which is to be used to determine the normal direction error that serves as the basis of error compensation in heliostat control system side,can be determined by this detection system.The theoretical basis and the implement of the solar tracking error detection system is presented in details in this paper,including the hardware circuit and sofeware impement of the both components of photoelectric detection and the modulated light source. |
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