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Proceedings Paper

Moiré topography using a liquid-crystal-grating based frequency modulation technique
Author(s): Fumio Kobayashi; Yukitoshi Otani; Toru Yoshizawa
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Paper Abstract

A projection moiré topography using two liquid crystal (LC) grating devices is proposed using frequency modulation. The moiré contour can be obtained by changing the LC grating pitch. It is possible to remove the original grating by electrically varying the period and averaging appropriately. Both a frequency modulation and a phase shift technique are applicable to this system because of the LC grating device. Some experimental results are presented.

Paper Details

Date Published: 11 August 2008
PDF: 6 pages
Proc. SPIE 7063, Interferometry XIV: Techniques and Analysis, 70630O (11 August 2008); doi: 10.1117/12.798147
Show Author Affiliations
Fumio Kobayashi, Tokyo Univ. of Agriculture and Technology (Japan)
Yukitoshi Otani, Tokyo Univ. of Agriculture and Technology (Japan)
Toru Yoshizawa, Saitama Medical Univ. (Japan)


Published in SPIE Proceedings Vol. 7063:
Interferometry XIV: Techniques and Analysis
Joanna Schmit; Katherine Creath; Catherine E. Towers, Editor(s)

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