基于矢量波像差理论的两反光学系统装调研究

摘要

为了实现对两反光学系统的精密装调,提出一种基于矢量波像差理论和波像差检测技术对失调量精确求解的装调方法.使用矢量波像差理论,将已设计的两反光学系统参数、失调量和失调光学系统的波像差之间建立方程;然后通过干涉测量法得到某一个视场的干涉图,利用条纹分析软件得到表征失调系统三阶彗差和三阶像散的泽尼克项系数,将泽尼克项系数代入方程从而求解出失调量.运用此方法对4m口径RITCHEY-CHRETIEN结构的天文望远镜进行模拟装调,最终求解的失调量与引入的失调量结果相互吻合,说明该装调方法正确.%In order to realize the precise alignment of a two mirror optical system, a method using wavefront aberration measurement technique is introduced to accurately measure misalignment. The equations between the designed optical parameters, misalignment values and the wavefront aberration of misaligned optical system were established using vector wavefront aberration theory. The interferogram of a field of view was obtained through interferometry, and Zernike coefficients representing third-order coma and third-order astigmatism of misaligned system were obtained using fringe analysis software. Finally, Zernike coefficients were substituted into the equations to solve the misalignment values. The alignment of a 4 meter aperture RITCHEY-CHRETIEN astronomical telescope was simulated. The solved misalignment values were fitted to the introduced misalignment values, and the accuracy of the method was proved.