Phase-shifting speckle interferometer using liquid crystal cell

Hirofumi Kadono; Satoru Toyooka

doi:10.1117/12.269830

20 March 1997 Phase-shifting speckle interferometer using liquid crystal cell

Hirofumi Kadono, Satoru Toyooka

Proceedings Volume 2921, International Conference on Experimental Mechanics: Advances and Applications; (1997) https://doi.org/10.1117/12.269830
Event: International Conference on Experimental Mechanics: Advances and Applications, 1996, Singapore, Singapore

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.

Citation Download Citation

Hirofumi Kadono and Satoru Toyooka "Phase-shifting speckle interferometer using liquid crystal cell", Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); https://doi.org/10.1117/12.269830

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