介绍了刀口法测温原理。
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。
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.
对空间滤波法的零频滤波与刀口滤波显示位相型物体的非均匀位相分布进行较为普遍且详尽的分析讨论，并给出一些实验结果。
Universally analyzed and discussed in this paper is the visualization of inhomogeneous phase distribution of phase objects with spatial zero frequency filtering and knife edge filtering method.
该方法克服了传统刀口扫描法的缺陷， 消除了由于离散型光学元件的离散性产生的空间非平移不变性的影响，减小了测量误差，提高了精确度。
The method avoids the influence of non-isoplanantic result from the dispersancy position between the edge and the array for measured MTF, and its precision was improved accordingly.
对刀口边缘误差进行了定量分析，得出在一定精度范围内测量光强的区域，定性分析了使用拟合法求MTF优于使用均值法求MTF。
The quantitative analysis result shows that it can reach the given precision by only measuring limited area. It also shows that fitting-curve-method is better than averaging method for precision.
对刀口边缘误差进行了定量分析，得出在一定精度范围内测量光强的区域，定性分析了使用拟合法求MTF优于使用均值法求MTF。
The quantitative analysis result shows that it can reach the given precision by only measuring limited area. It also shows that fitting-curve-method is better than averaging method for precision.
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