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Proceedings Paper

Frequency-shifting shadow moire technique
Author(s): Zhao Wang; Yushan Tan; Hong Zhao; Wenyi Chen
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Paper Abstract

A new method is presented to extract quantitative information of Moire fringes. It is different from the method of phase shift. Instead of changing the phase of Moire fringe, it changes the frequency of the Moire fringe. The theoretical formula is introduced for a special relationship of three frequencies. For unwrapping the phase image, the first step is to expand the cosine value range from (0, (pi) ) to (0,2 (pi) ) to avoid the indetermination of 'plus' or 'minus.' The experiment result is given and the effect of the position of light source on measuring results is also discussed.

Paper Details

Date Published: 6 July 1998
PDF: 8 pages
Proc. SPIE 3479, Laser Interferometry IX: Applications, (6 July 1998); doi: 10.1117/12.316442
Show Author Affiliations
Zhao Wang, Xian Jiao Tong Univ. (China)
Yushan Tan, Xian Jiao Tong Univ. (China)
Hong Zhao, Xi'an Jiaotong Univ. (China)
Wenyi Chen, Xian Jiao Tong Univ. (China)


Published in SPIE Proceedings Vol. 3479:
Laser Interferometry IX: Applications
Ryszard J. Pryputniewicz; Gordon M. Brown; Werner P. O. Jueptner, Editor(s)

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