拼接镜主动光学面形控制的研究

为了实现对拼接式望远镜各子镜的主动控制，建立了正六边形子镜拼接的面形控制方程。研究了传感器的安装位置对面形控制的影响。首先，根据子镜之间相对位置的测量要求确定了主动控制所采取的方式。接着，建立了由3个正六边形子镜组成的拼接镜的面形控制方程，并分析了传感器的安装位置对面形控制的影响，提出了传感器沿垂直镜缝方向错位安装的方法。最后，分析了该方法对于拼接子镜扩展的适用性。分析表明，对于边长0.9m，对角线长1.8m的子镜，传感器错开0.02m安装就能够准确检测子镜之间的位置变化，并给出了正确的促动器调整信息。能够满足拼接镜主动面形实时、高精度控制等要求。

Active optics figure control of the segmented mirror

In order to active control each segment of the segmented telescope, the figure control equation of hexagonal mirrors was built up, and we researched the impact of the sensor location on the figure control system. First, we confirmed the manner adopt by the active control system based on the measurement requirements of the segments relative location. Then, the figure control system of 3 segments was built up, and the influence of the sensor location on the figure control was analyzed, and put forward a sensor setting scheme in which sensor is perpendicularly away in centimeters and the two nearby sensors along the gap are away in the adverse direction. Finally, we testified the applicability of this method to the extent of segmented mirrors. Analysis, based on the segment mirror with length of side of 0.9m and diagonal of 1.8m, shows that 0.02m stagger fix location of the two sensors along the same gap can exactly measure the change of location between the mirrors, and the control system can give out the true adjust information of actuators. It can satisfy the requirements of real time, high precise control of the active figure control of segmented mirror.