The primary relationship between the size of the focal sp ot and RMS of phase gradient was also given by simulation calculation.

通过模拟计算，给出低频位相噪声的均方根梯度与聚焦光斑尺寸的初步规律。

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The feature model presented here is consisted ot five components: solid model, measure elements, size dimensions, and location dimensions as well as constrains behaviour.

提出了以实体模型、测量要素、定形尺寸、定位尺寸、行为约束为构造成份的特征模型；

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