摘要
在自适应光学系统中，波前探测器的噪声、未完全补偿湍流所引起的误差以及变形镜的拟合误差是主要的误差源．本文针对已经建立的2．16m望远镜红外自适应光学系统，从伺服控制系统的角度分析了该系统的闭环噪声、大气湍流引起的误差以及该系统的闭环总体误差．该系统的闭环总体误差是光强及系统闭环带宽的函数．本文还分析了该系统的有效性以及对大气湍流不同改善程度情况下光强与闭环带宽的关系．并在此基础上给出了该系统的最佳带宽选取及系统的极限工作星等．
In an adaptive optics system, the major error source is made up of the noise of the wavefront sensor, the uncompensated error induced by atmospheric turbulence and thefitting error of the deformable mirror. As for the infrared adaptive optics at the 2.16 mtelescope of Beijing Astronomical Observatory, the closed-loop noise, the error caused by turbulence and the total error are analysed in terms of servo control loop. The total error of this adaptive optical closed-loop system is functions of the photon counting rates and the closed-loop bandwidth. The effectiveness of this adaptive optics system and the connection between the photon counting rates and the closed-loop bandwidth in different improvements of turbulence are also analysed. Furthermore, the optimal closed-loop bandwidth and the limiting magnitude of this adaptive optics system are derived.
基金
国家863计划支持课题
关键词
望远镜
自适应光学
大气湍流
误差
性能分析
2.16m telescope adaptive optics atmosphere turbulence shearing interferometer
