激光衍射法测量低频液体表面波的参量

实验中实现了液体表面波光栅的光衍射，得到了稳定、清晰的衍射图样。改变表面波振幅，发现了各级衍射条纹的强度变化。理论上分析了表面波的光衍射效应，得到了衍射光强度和表面波振幅以及条纹的空间分布和表面波波长的关系。提出了测量液体的表面张力系数、表面波振幅、波长及波速等表面波参量的方法。该方法具有实时、无损和简单实用的特点。

Measurement in the Parameters of the Low Frequencies Surface Waves by Means of Laser Diffraction

Highly visible stationary laser diffraction patterns from liquid surface waves were obtained experimentally. The diffraction intensity is variable with the surface wave amplitude which was also found. The dependence of the diffraction intensity upon the surface wave amplitude and the relation of fringes distribution with surface wave wavelength were derived. A real-time and non-contact measurement in the parameters of the liquid surface waves were developed. Meanwhile, the simple experiment set-up was established.