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Instantaneous measurement of surface shape with high accuracy by one-shot digital holography

机译：一键式数字全息术可即时高精度地测量表面形状

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摘要

A new method is proposed for instantaneous measurement of 3-D shape of moving objects with rough surface by using one-shot digital holography. The principle of proposed method consists of projection of interference fringes with a constant period on surfaces, one-shot recording of the complex-amplitude in-line hologram, elimination of speckle from reconstructed images, and calculation of depth from focus. The acquisition time is less than 1 micro-second needed for recording one hologram. Speckles appeared in reconstructed images are eliminated into a low level by filtering. Following the method of depth of focus, we can precisely determine 3-D position of each point on the surface. Accuracy higher than 0.01% is obtained in the experiment of depth measurement because of low-level speckles.
机译：提出了一种通过单次数字全息技术瞬时测量具有粗糙表面的运动物体的3-D形状的新方法。所提出的方法的原理包括在表面上以恒定周期投射干涉条纹，一次记录复振幅在线全息图，从重建图像中消除斑点以及从焦点计算深度。采集时间少于记录一张全息图所需的1微秒。通过过滤将重建图像中出现的斑点消除到低水平。按照聚焦深度的方法，我们可以精确确定表面上每个点的3D位置。由于深度斑点的影响，在深度测量实验中获得了高于0.01％的精度。

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