Using a knife edge to measure the MTF of optical system is a basic way. The paper discusses the influence of slitedge error on MTF by building a mathematical model.
In Fraunhofer diffraction of a slit, the slit widths obtained with the fringes produced by polarized light whose vibration is parallel or perpendicular to the slitedge are different.
在狭缝的夫琅和费衍射中，由振动平行和垂直于缝边的偏振光的衍射条纹得到的缝宽值不同。
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Thin edge(about 1mm thickness)slitting with automatic and manual grindstone grinding to keep edge sharp and make slit paper smooth and tidy.