别汉棱镜光轴一致性检测与装调方法

针对在平行光路中无法检测别汉棱镜光轴和机械轴之间的位移误差问题，提出了位移误差检测方案，设计了别汉棱镜光轴一致性检测系统，包括检测光路和对照光路，这两条光路总长相等，MTF均接近衍射极限，根据设计的检测系统搭建检测光路，对口径为25 mm的别汉棱镜进行装调，先后在传统平行光路和本文所设计的检测光路中检测并调整棱镜光轴和机械轴之间的角度误差和位移误差，并使其最小，最终测得别汉棱镜的出射光轴与入射光轴的光轴一致性精度为±48″,将装调好的别汉棱镜和旋转轴系装入正式系统中装调，测得光轴一致性精度为±0.8个像素，达到像素级精度。本文提出的检测方法提高了在系统中装调别汉棱镜光轴的效率和精度。

Optical axis consistency detection and installation method for Pechan prism

In this paper,a displacement error detection scheme is proposed in view of the inability to detect the displacement error between the optical axis and the mechanical axis of the Pechan Prism in a parallel optical path.A consistency detection system for the optical axis of the Pechan Prism is designed,including the detection optical path and the control optical path.The total length of these two optical paths is equal,and the MTF is close to the diffraction limit.Then,a detection optical path is built based on the designed detection system and the Pechan Prism is mounted with a diameter of 25mm.The angle error and displacement error between the prism optical axis and the mechanical axis are detected and adjusted in both the traditional parallel optical path and the detection optical path designed in this paper.Finally,the consistency accuracy of the output optical axis and the incident optical axis of the Pechan Prism is measured to be ±48″.The mounted Pechan Prism and rotating axis system are installed and adjusted in the formal system,and the consistency accuracy of the optical axis is measured to be ± 0.8 pixels,reaching pixel level accuracy.The detection method proposed in this article improves the efficiency and accuracy of installing and adjusting the optical axis of the Pechan Prism in the system.