Computer-aided alignment is an effective method to improve the imaging quality of high-precision, complex, and off-axis optical systems. However, how to determine the misalignment quickly, exactly and constantly is essential to the technology of computer-aided alignment. Owing to the varying optical characteristics of a zoom system, sensitivity matrices are used in the alignment rather than a single matrix. Thus, the processing of sensitivity matrices is important for the computer-aided alignment of the reflective zoom system. So, the total least squares is proposed in order to solve the problems of the numerical instability and the result inaccuracy which result from the solution of the least squares method directly. Finally, the simulant calculation is processed using the numerical analysis model established in the essay. The results demonstrate that the computation method is rational and effective.
Traditional mechanical compensation zoom system realize the continuous change of the system focal length and continuous compensation of the image plane through the motion of the zooming group and compensating group according to the precise cam curve. With the increase demand of high zoom ratio and high quality system, and combined with the theory of reflective zoom system, this paper presents the all movable reflective zoom theory, focusing on the design and analysis of the three-mirror all movable reflective zoom system.