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Proceedings Paper

Phase-shifting speckle interferometer using liquid crystal cell
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Paper Abstract

Fundamental properties of phase modulation ability of a nematic liquid-crystal (NLC) cell is first studied. Based on the phase modulation property of the liquid-crystal (LC) cell, a new type of speckle shearing interferometer is proposed. In the method, a LC cell is employed as a phase shifter to implement the phase shifting method for the conventional speckle shearing interferometer. Next, a phase unwrapping method that particularly has the advantage of unwrapping of phase distribution with severe noise such as those obtained in speckle interferometry is proposed. Computer simulations were carried out to examine the performance of the proposed method. Finally, experiments were made to demonstrate the usefulness of the proposed phase shifting speckle interferometer together with the improved phase unwrapping method.

Paper Details

Date Published: 20 March 1997
PDF: 6 pages
Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); doi: 10.1117/12.269830
Show Author Affiliations
Hirofumi Kadono, Saitama Univ. (Japan)
Satoru Toyooka, Saitama Univ. (Japan)

Published in SPIE Proceedings Vol. 2921:
International Conference on Experimental Mechanics: Advances and Applications
Fook Siong Chau; C. T. Lim, Editor(s)

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