Schlieren方法中的二维空间滤波效应

Effect of 2 D Spatial Filtering in Schlieren Methods

在分析一维Ｓｃｈｌｉｅｒｅｎ方法不能有效显示二维弱位相分布的基础上，为有效地显示二维位相梯度分布，构造了几类二维直角空间滤波函数，并分别计算了它们的滤波效应．结果表明几类二维空间滤波都可以较大的衬度同时显示二维弱位相梯度分布，且不同形式的二维空间滤波对像面强度分布的“直流”分量有影响．

The effect of 1 D schlieren method is studied, it is shown that 1 D schlieren method is not suitable for 2 D phase gradient observation. Some 2 D rectangular knifes filters are proposed to display 2 D phase variation. The effect of function of 2 D spatial and different 2 D spatial filter effects “direct current component” of image intensity level distribution.