通过数字分析,我们得出了光点大小和旋转光棚线宽之间的关系式。为了说明这个关系式引用了调制传递函数的概念。从数学计算和实验二者结果的比较来看,它们是符合的。对于测量光点大小,象面的最佳位置和光学系统的象质评价,这关系式和测量方法是非常有用的。 Through numerical analysis, we come to the relationship between the spot size and the width of the light shed. To illustrate this relation, the notion of modulation transfer function is quoted. Judging from the comparison between the results of math and experiment, they are consistent. This relationship and measurement method is very useful for measuring the spot size, the best position of the image plane, and the quality evaluation of the optical system.