低频液体表面波衍射条纹正负级次的不应性

Abstract

Based on the acousto-optic diffraction theory,the light diffraction characteristics of lowfrequency liquid surface waves was investigated using the method of optical.An expression was given about the non-corresponding orders,the analytical expression was simulated by means of the numerical method,which explains the mechanism of the non-correspondence effect.In experiment,the steady and visible diffraction pattern was observed,and the fringe spacing has obvious asymmetry.With the increasing of incident angle,the distinct non-correspondence of the positive and negative diffraction orders is found.The number of the positive diffraction pattern is more than the negative one.The results show that:the non-correspondence effect is related to the incident angle.With the increasing of incident angle,the non-correspondence effect is more obvious.The negative diffraction order has maximum.For the orders exceeding this value,the negative diffraction pattern disappeared.It shows that the theoretical analysis agrees with the experimental result well.