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Proceedings Paper

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

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.

Paper Details

Date Published: 7 February 2011
PDF: 8 pages
Proc. SPIE 7957, Practical Holography XXV: Materials and Applications, 795708 (7 February 2011); doi: 10.1117/12.876350
Show Author Affiliations
Yoshihide Iwayama, Univ. of Hyogo (Japan)
Kunihiro Sato, Univ. of Hyogo (Japan)

Published in SPIE Proceedings Vol. 7957:
Practical Holography XXV: Materials and Applications
Hans I. Bjelkhagen, Editor(s)

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