11 August 2008 Moiré topography using a liquid-crystal-grating based frequency modulation technique
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Proceedings Volume 7063, Interferometry XIV: Techniques and Analysis; 70630O (2008); doi: 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.
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Fumio Kobayashi, Yukitoshi Otani, 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); doi: 10.1117/12.798147; https://doi.org/10.1117/12.798147
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KEYWORDS
Liquid crystals

Frequency modulation

Binary data

CCD cameras

Moire patterns

Lenses

Light sources

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