透射式光学系统计算机辅助装校技术初步研究

Research on computer-aided alignment based on refract optical system

应用于航天遥感领域的透射式光学镜头光学元件多,分离变量多,结构复杂,成像质量要求接近衍射极限,对光学装调有着苛刻的要求。传统的透射式系统装调一般采用直装定心的方法,通过机床定心和实验室定心结合依次将各个元件的偏心和倾斜调整到预设置公差范围之内。这种方法增加了过程控制的难度,影响了装调一次成功率。在透射式系统装调中引入计算机辅助装调技术是突破传统装调方法,提高系统装调质量和效率行之有效的手段。借助计算机辅助装调技术,通过设置补偿环节的方法针对某一透射式光学镜头的初级像差进行调整,成功将系统装调结果 RMS从0.084λ(λ=632.8 nm)提高到0.046λ,实现了高精度、高效率的装调。

Refract optical system using in remote sensing usually has many elements, complicated structure, and diffraction limited image quality, which makes the assemble puzzled. The tradition way is to alignment each optical element piece by piece, through the device designed to measure the surface tilt error of spherical surfaces with respect to a reference axis. It is time consuming, and worse than all the result is uncertain of successful. In this paper, the method of computer aid alignment was introduced as an assistant to avoid strict process control and reduce the difficulty. A example releases that when a special sensitively variables like distance between two lens is chosen as compensator to reduce the primary aberration after optimization of the optical system, it is effective and convenient to raise the optical system wavefront error RMS from 0.084 λ（λ=632.8 nm） to 0.046λ.