将傅里叶变换轮廓术(FTP)运用到动态液体面形测量,采用CCD快速获取由龙基(Ronchi)光栅投影到处于动态变化过程的液体表面上的一系列变形条纹,经过傅里叶变换、频谱滤波、逆傅里叶变换、三维相位展开等处理后得到重建的一系列液面面形,能再现动态液面的变化过程,也能获取液体旋涡的一些特征参数,为流体力学相关研究提供了一种新的方法.

Fourier transform profilometry (FTP) is used for dynamic liquid surface shape measurement. A sequence of dynamic deformed fringe images can be grabbed by CCD camera and saved on disk rapidly. By Fourier transform, filtering, inverse Fourier transform and unwrapping these phase maps in 3 D phase space, the shape of a vortex at different times is obtained. The experimental results show that FTP can efficiently deal with the dynamic liquid surface shape measurement.