7 February 2011 Instantaneous measurement of surface shape with high accuracy by one-shot digital holography
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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.
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Yoshihide Iwayama, Yoshihide Iwayama, Kunihiro Sato, Kunihiro Sato, } "Instantaneous measurement of surface shape with high accuracy by one-shot digital holography", Proc. SPIE 7957, Practical Holography XXV: Materials and Applications, 795708 (7 February 2011); doi: 10.1117/12.876350; https://doi.org/10.1117/12.876350

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