Development of the phase measurement system for segmented mirror telescope

本研究开发了京都3.8m波长精度为1/20的分段镜望远镜的分段镜控制技术。与现有的使用天然恒星的方法不同，使用这种方法可以使用五色激光快速测量每个段镜的相对位置，而不受大气或天气的干扰。与原有的高精度执行器相结合，我们可以成功地利用真实望远镜的一个复制部分来调整分段镜的位置。

In this study, the control technology of segment mirrors for Kyoto 3.8m segmented-mirror telescope with an accuracy of 1/20 wavelength has been developed. Different from the existing procedure using natural stars, the relative position of each segment mirror can be measured quickly with this procedure using a 5-color laser, without disturbances of atmosphere or weather. In combination with the original high-accuracy actuator, we could adjust the position of segment mirrors using a duplicated part of the real telescope successfully.