Moiré topography using a liquid-crystal-grating based frequency modulation technique

Fumio Kobayashi; Yukitoshi Otani; Toru Yoshizawa

doi:10.1117/12.798147

11 August 2008 Moiré topography using a liquid-crystal-grating based frequency modulation technique

Fumio Kobayashi, Yukitoshi Otani, Toru Yoshizawa

Author Affiliations +

Proceedings Volume 7063, Interferometry XIV: Techniques and Analysis; 70630O (2008) https://doi.org/10.1117/12.798147
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

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.

Citation Download Citation

Fumio Kobayashi, Yukitoshi Otani, and Toru Yoshizawa "Moiré topography using a liquid-crystal-grating based frequency modulation technique", Proc. SPIE 7063, Interferometry XIV: Techniques and Analysis, 70630O (11 August 2008); https://doi.org/10.1117/12.798147

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