中文摘要：

为了测量矩形弹性壳液耦合系统中的重力波的三维外形，实现大变形液体的非接触测量，使用激振器对矩形弹性壳液耦合系统在水平方向进行激振，得到大幅低频重力波、用幻灯机将光栅投影到重力波表面，光栅图像因为重力波的出现会发生变形、采用CCD摄像机和图像采集系统，分别采集到液体表面静止和出现重力波时的光栅图像，经过频域的滤波处理以后，计算得到重力波的三维形貌、结果表明，傅里叶变换莫尔法对实现大变形液体三维形貌的非接触测量非常有效，它提供了一种研究壳液耦合问题的新方法。

英文摘要：

The 3-D shapes of gravity waves in rectangular elastic fluid-shell coupled system are presented to realize the untouched measurement of the fluid large deformation. When the rectangular elastic fluid-shell coupled system is forced by high frequency, several kinds of gravity waves will appear. In order to obtain the 3-D shapes of gravity waves, the fluid-shell coupled system is generated by an exciter in horizontal direction with the initial grating pattern projected to the water surface, when the waves appear, the grating pattern deforms and they are captured by the camera and stored. Through calculating with FTP method, the 3-D shape is obtained. The result shows that the FTP method is effective in measuring the large deformed fluid surface and provides a new way to study the fluid-shell coupled problem.