【摘要】 本文提出一个确定任何光学系统焦距的普遍方法，并从理论上论述了同心环形光栅环状莫尔条纹的产生机理，推导出由光栅副所产生的环状莫尔条纹测量光学系统焦距的定量表达式，并在实验上给出了测量结果。实验表明，使用该方法非常简便，有很广的应用范围。更多还原

【Abstract】 In this paper we have given a universal method for determining the focal length of optical systems and expounded the mechanism of circular moire fringes on circular concentric gratings. We have also given the quantity expression and the experimental results. The experimental results have demonstrated that this method is very simple and has a great application field.更多还原