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来自远处目标的光波通过大气以后,由于大气湍流将使波面发生随机起伏,导致望远镜分辨率下降,而且口径越大,湍流效应越明显。为获得接近衍射极限的分辨率,就需要采用自适应光学技术对波面误差进行实时校正。而自适应光学系统之所以具有能动可控的特点,关键之一是它具有能控制光程的元件——变形镜。本文将从空间域的观点出发,讨论21元变开镜的最佳影响函数,机械耦合的确定及其滤波函数,并估算21元变形镜对大气湍流的补偿效果。
After the light from the distant target passes through the atmosphere, the turbulence effect will be more obvious due to the turbulence of the atmosphere causing the wave surface to randomly fluctuate, resulting in the decrease of the resolution of the telescope. In order to obtain the resolution close to the diffraction limit, it is necessary to use adaptive optics to correct the wavefront error in real time. The reason why the adaptive optics has the characteristics of being moveable and controllable is that one of the keys is that it has a deformable mirror that can control the optical path. In this paper, from the point of view of the spatial domain, the optimal influence function, the determination of mechanical coupling and the filtering function of the 21-element open mirror are discussed, and the compensation effect of the 21-element deformable mirror on the atmospheric turbulence is estimated.