用于测量流体表面的小偏转的Total-internal-reflection偏转仪
Total-internal-reflection deflectometry for measuring small deflections of a fluid surface
摘要：
我们描述了一种方法，利用全内反射在水-空气界面内的一个大的，透明的坦克，测量界面的偏转。使用这种配置，我们得到一个光学设置的液体表面作为一个变形镜。的设置被证明是非常敏感的反射水面，这是通过可视化的参考图案的反射检测到的非常小的干扰。当水面变形时，它会反射参考图案的扭曲图像，类似于合成纹影设置。使用合适的图像相关方法分析图案的失真。由此获得的位移场与水面的局部空间梯度相关。在最小二乘意义上的梯度场积分，以获得完整的瞬时重建的水面。当固体物体刚好放置在水面上方时，这种方法特别有用，其存在使得液体表面以其他方式光学不可接近。
英文摘要：
We describe a method that uses total internal reflection at the water-air interface inside a large, transparent tank, to measure the interface's deflections. Using this configuration, we obtain an optical set-up where the liquid surface acts as a deformable mirror. The set-up is shown to be extremely sensitive to very small disturbances of the reflecting water surface, which are detected by means of visualising the reflections of a reference pattern. When the water surface is deformed, it reflects a distorted image of the reference pattern, similar to a synthetic Schlieren set-up. The distortions of the pattern are analysed using a suitable image correlation method. The displacement fields thus obtained correlate to the local spatial gradients of the water surface. The gradient fields are integrated in a least-squares sense to obtain a full instantaneous reconstruction of the water surface. This method is particularly useful when a solid object is placed just above water surface, whose presence makes the liquid surface otherwise optically inaccessible.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
