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利用单块镜面的等腰三角支撑结构,从数学模型出发,分析镜面支撑杆的长度变化与接收屏上光斑位置的关系。研究发现支杆的运动和反射光斑运动有近似线性关系。当支撑杆P1和P2等量相对和相向运动时,光斑在接收屏上的轨迹是两条近似相互垂直的直线,由此光斑在屏上的任意位置可通过这两个方向的运动组合得以实现。结合图像处理技术和自动控制技术,将此算法设计成一套基于计算机控制的闭环自动调光系统并将其用于实验分析。实验结果可验证理论的正确性,与传统的“Color Look-Back”和“AIMFAST”方法相比,新系统不但保持了传统方法的优点,并且在场地限制方面表现出很大的优势。
Based on the single-isosceles triangular isosceles support structure, the relationship between the length of the mirror support bar and the position of the light spot on the receiving screen is analyzed based on the mathematical model. It is found that there is an approximate linear relationship between strut motion and reflected speckle motion. When the support rods P1 and P2 are in relative and opposite movement, the track of the light spot on the receiving screen is two straight lines approximately perpendicular to each other, so that any position of the light spot on the screen can be realized by a combination of the two directions of motion . Combined with image processing technology and automatic control technology, the algorithm is designed as a computer-controlled closed-loop automatic dimming system and used in experimental analysis. The experimental results verify the validity of the theory. Compared with the traditional “Color Look-Back” and “AIMFAST” methods, the new system not only retains the advantages of the traditional method, but also displays a great effect on site constraints Advantage.