Taking single slit as an example, the relationship between phase error and resulting accuracy is given.

以单缝衍射为例，讨论了误差相位与计算精度的联系。

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According to the structure of instrument, the influence of the slit width on spectral line is discussed, the relative measurement error of instrument is also analyzed.

根据仪器结构讨论了狭缝对谱线的影响，给出了狭缝宽度和谱线宽度的对应关系，并对仪器谱面上的相对测量误差进行了分析。

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Using a knife edge to measure the MTF of optical system is a basic way. The paper discusses the influence of slit edge error on MTF by building a mathematical model.

刀口法是测量光学系统的传递函数一种基本方法，通过对刀口边缘误差建立数学模型，讨论刀口误差对光学传递函数测量精度的影响。

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