椭球面反射镜的光轴引出方法

椭球面镜作为反射式镜头主镜的常用类型，准确、便利地引出其光轴，在镜头装调过程中是必不可少的。传统的光轴引出方法主要依靠三坐标仪进行测量，由于其角度拟合精度低、接触式测量和尺寸限制等缺陷，已经无法满足现下的大口径光学镜头装调需求，为此，提出一种新型椭球面主镜光轴引出方法，该方法通过设计一个平面球差补偿器，搭建出椭球面镜的无相差面型检测光路，将椭球面镜的光轴转换为补偿器的法线，再使用经纬仪测量法线与结构基准间的角度关系，间接地引出主镜光轴，光轴引出精度可达1.4″。相较于传统的光轴引出方法，该方法具有更高的角度测量精度、非接触、无尺寸限制等优点，适用范围更广。

Optical axis elicitation method for ellipsoidal mirror

The ellipsoid is the most common type of primary mirror for the reflective lens. And it is necessary to accurately and conveniently elicit the primary mirror's optical axis in the process of lens alignment, which used as the reference axis of the whole optical system. The traditional optical axis extraction methods mainly rely on a three-coordinate instrument to perform measurement. Due to its low angle fitting precision, contact measurement, and aperture limitation, the conventional optical axis system can no longer meet the requirements of the current large-aperture optical system. To this end, a novel ellipsoidal main mirror optical axis extraction method was proposed. By designing a plane spherical aberration compensator, the non-phase difference surface detection optical path of the ellipsoidal mirror was constructed, and the optical axis of the ellipsoidal mirror was converted into the normal line of compensator, and then the theodolite was used to measure the angular relationship between the normal line and the structural reference, and the main mirror optical axis was elicited indirectly.Results show the optical axis extraction accuracy can reach 1.4″.Compared with traditional optical axis extraction methods, the method has the advantages of higher angular measurement accuracy, non-contact, no size and wider application range, etc.