平面光栅多色仪的彗差分布特性

本文从C-T型平面光栅多色仪的结构出发,导出了视场内各点的离轴角与中心视场离轴角、视场角及光栅与反射镜间距之间的关系。采用初级彗差表达式,分析了视场中彗差分布的特点,讨论了彗差校正策略。最后给出了一个实例,结果证明与理论分析相符合。

The Coma Distribution oF C-T polychromator

In the paper, an expression is derived based on the polychromator construction, which relates the off-axis angle of any rays to the off-axis angle of central wavelength rays, the field angle and the distance between grating and spheric mirror, when primary coma is adopted, the coma distribution within whole field is analysed, and some characteristic is pointed out. Also coma-correction policy is discussed. Finally, a illustration is presented which support what obtained in this paper.