Importance of tip sensing for active control system of 30-m RIT primary mirror  

作　　者：戴懿纯 刘忠 金振宇 

机构地区：[1]Yunnan Astronomical Observatory,Chinese Academy of Sciences

出　　处：《Chinese Optics Letters》2009年第9期791-794,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.10573035,10533040);the National "973" Program of China(No.2006CB806300).

摘　　要：The active control of 30-m ring interferometric telescope （RIT） needs edge sensing and tip sensing when its primary mirror is composed by trapezoid-shaped segments, and the imaging performance of the RIT is determined by the accuracy of these two detecting approaches. Considering the detecting accuracy available in current segmented telescope active control systems, the effect of these detecting approaches on the surface error of the RIT primary mirror is calculated from the point of error propagation. The corresponding effect on imaging performance （modulation transfer functions （MTFs） and point spread functions （PSFs） at several typical wavelengths） of the RIT primary mirror is also simulated. The results show that tip sensing is very important for increasing the active control quality of the RIT primary mirror under the present techniques.The active control of 30-m ring interferometric telescope （RIT） needs edge sensing and tip sensing when its primary mirror is composed by trapezoid-shaped segments, and the imaging performance of the RIT is determined by the accuracy of these two detecting approaches. Considering the detecting accuracy available in current segmented telescope active control systems, the effect of these detecting approaches on the surface error of the RIT primary mirror is calculated from the point of error propagation. The corresponding effect on imaging performance （modulation transfer functions （MTFs） and point spread functions （PSFs） at several typical wavelengths） of the RIT primary mirror is also simulated. The results show that tip sensing is very important for increasing the active control quality of the RIT primary mirror under the present techniques.

关 键 词：Control system analysis Mirrors Optical instruments Optical telescopes Optical transfer function Telescopes 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]