基于反向共轴的大口径平面光学元件面形测量

提出了一种基于反向共轴的大口径平面光学元件面形测量方法。将双位移传感器反向共轴线扫描测量模式和多角度旋转三面互检技术结合,借助直线长导轨有效扩大平面光学元件测量口径,同时测量过程中不需要使用标准平晶,避免引入标准平晶参考面不确定度分量,测量结果直接溯源到激光波长基准。利用该测量方法对3块400mm口径光学平晶进行面形测量,验证了该测量方法的可行性。

Surface Measurement Method Based on Reverse Coaxial Mode for Large Aperture Plane Optical Elements

A surface measurement method based on reverse coaxial mode for large aperture plane optical elements is proposed. It combines the reverse coaxial line-scanning measurement mode of dual displacement sensors with three-flat test technology of multiple angle rotation. It effectively expands the measurement aperture of plane optical elements with the help of linear long guide rails. At the same time, it does not need to use a standard flat crystal during the measurement process, which can avoid introducing the uncertainty component of the reference flat of the standard plane crystal. The measurement results are directly traceable to the laser wavelength reference. The surface measurement of three 400mm diameter optical plane crystals is carried out using the measurement method, and the feasibility of the measurement method is verified through experiments.