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Proceedings Paper

Phase-unwrapping method in real-time shape measurement using composite rectangular grid
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Paper Abstract

It is possible to measure the 3D shape of an object using grid projection methods. Moire topography which is a kind of grid projection methods can obtain the contour lines of the measured object in real-time. The authors developed a real-time shape measurement system based on the Moire topography. In order to perform quantitative and real-time shape measurement, we developed the integrated phase shifting method. However, the obtained distribution is wrapped in the range of -(pi) to (pi) . Therefore, a real-time phase unwrapping process is required. The present paper proposes a new unwrapping method using a composite rectangular grid which si composed of two rectangular waves of different pitches. The composite rectangular grid is projected onto an object. Each phase distribution of the two waves can be separated and calculated using the integrated phase-shifting method. The unwrapped phase distribution is produced from the two different phase distributions.

Paper Details

Date Published: 29 May 2002
PDF: 5 pages
Proc. SPIE 4537, Third International Conference on Experimental Mechanics, (29 May 2002); doi: 10.1117/12.468844
Show Author Affiliations
K. Iwai, Wakayama Univ. (Japan)
Yoshiharu Morimoto, Wakayama Univ. (Japan)
Motoharu Fujigaki, Wakayama Univ. (Japan)
Satoru Yoneyama, Wakayama Univ. (Japan)

Published in SPIE Proceedings Vol. 4537:
Third International Conference on Experimental Mechanics
Xiaoping Wu; Yuwen Qin; Jing Fang; Jingtang Ke, Editor(s)

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