空间滤波。泽尼克相衬显微镜实验。显微术中观察物体通常透明度很高，当光线通过这样的物体时，主要原因是因为厚度不同而产生相位的变化。但是通常的显微镜只是对光强响应，不会反映相位变化，所以无法观察厚度和结构。泽尼克提出的相位相称方法很好的解决了这个问题。-Spatial filtering.Nick phase contrast microscope.Microscopy observation objects usually transparency is very high, when the light through the object, the main reason is that the thickness of different phase change.But usually microscope is a strong response, light is not reflected phase change, so I can t watch the thickness and structure.Ze Nick proposed phase proportion method very good solve the problem.