低频液体表面波的光衍射及衰减特性的研究

Study on diffraction and damping characteristics of low frequency liquid surface waves

为了研究液体表面波的衰减特性,采用激光衍射法,对液体表面波的振幅和传播距离之间的关系进行了实验取证和理论分析。实验结果表明,液体表面波的振幅随传播距离的增大而按指数型规律减小,并具有明显的色散效应,衰减系数液体表面波的随频率线性增大。这一结果对液体表面波的检测和应用是有价值的。

In order to study the damping characteristics of the liquid surface waves, the relation between the liquid surface wave amplitude and the spreading distance was testified experimentally and analyzed theoretically by means of laser diffraction. The experimental results indicated that the liquid surface wave amplitude declined exponentially with the spreading distance and the damping coefficient ,which varied lineally with frequency, has dispersive characteristics. The conclusion is valuable for liquid surface wave detecting and application.