基于ISIGHT平台的大型空间望远镜主镜主动光学系统研究

摘要

In order to realize the high image quality of large telescopes,the primary mirror active optical system model is established. The primary mirror deformation correction algorithm, the precision of the deformation correction and the ability of deformation correction are studied. First, The primary mirror deformation correction algorithm is studied. The structure of the primary mirror and the support are designed, and the primary mirror finite element model is estab-lished. Primary power matrix constructed units force matrix and the primary mirror deformation matrix are constructed, generalized inverse matrix method is used to obtain the primary mirror deformation correction matrix. Then the correc-tion precision analysis model of primary mirror deformation is established by using Isight platform. The primary mirror deformation correction precision is analyzed by taking coma as an example. Finally,the correction ability analysis model of primary mirror deformation is established by using the Isight platform. The correction ability of the primary mirror deformation is analyzed by taking astigmatism as an example when the actuators max adjustment force are 100N. The analysis results show that coma correction precision is about 4%;Active actuator can correct 0.467 wavelength astigma-tism. The primary mirror deformation correction algorithm and model are accuracy, and can be used for the primary mirror image correction.%为了实现大型空间望远镜的高成像质量，建立了主镜主动光学系统模型。对主镜面形校正的算法、主镜面形校正的精度以及主镜面形校正能力等进行研究。首先，对主镜面形校正的算法进行研究。对主镜的镜体结构和支撑方案进行设计，建立了主镜有限元模型。构造了单位主动力矩阵和主镜面形响应矩阵。采用广义逆矩阵法求得了主镜面形校正矩阵。接着，采用多学科分析平台Isight建立主镜面形校正精度模型，以慧差为例，分析了主镜面形校正的准确性。最后，采用Isight平台建立了主镜面形校正能力分析模型，以低阶像散为例，分析了在促动器最大调整力为100N时，主镜面形的校正能力。分析结果表明：主镜慧差的校正精度为4%；力促动器能校正0.467个波长的像散。主镜面形校正算法及模型基本准确，可用来进行主镜面形校正。