确性.针对不同空间滤波方式，分析声驻波成像条纹间距和条纹对比度的变化，提出一种新的用空间滤波手段测量声速的实验

方法.该理论研究及相关实验，完整地分析了声驻波的成像问题，也有利于加深对傅里叶光学中的空间滤波的理解.

and the imaging of that standing wave are studied. A spatial filtering experiment is designed to verify the formulas

which describes the fringe interval and contrast of the standing wave image. This method can also measure sound velocity

of the standing wave. We analyze the standing wave imaging completely and help to have a deeper understanding

of the spatial filtering method.