Interferometry

Speckle noise suppression in measurement by phase-shifting digital holography

[+] Author Affiliations
Ichirou Yamaguchi

Toyo Seiki Seisaku-sho, Ltd., 1-2-6 Funado, Itabashiku, Tokyo 174-0041, Japan

Masayuki Yokota

Shimane University, Interdisciplinary Faculty of Science and Engineering, Department of Electronic and Control Systems Engineering, 1060 Nishikawatsu-cho Matsue, Shimane, 690-8504, Japan

Opt. Eng. 48(8), 085602 (August 17, 2009). doi:10.1117/1.3204687
History: Received March 27, 2009; Revised June 25, 2009; Accepted June 29, 2009; Published August 17, 2009
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A new algorithm for fringe phase analysis is proposed for shape and deformation measurement of diffusely reflecting surfaces by digital holography. It derives the phase of the averaged conjugate product of complex amplitudes before and after wavelength change or object deformation, corresponding to the complex coherence factor, and is consistent with a theory on fringe formation in holographic interferometry. By experiments and computer simulations, it is demonstrated that the algorithm is much more immune to speckle noise in phase analysis and unwrapping than conventional methods.

© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Ichirou Yamaguchi and Masayuki Yokota
"Speckle noise suppression in measurement by phase-shifting digital holography", Opt. Eng. 48(8), 085602 (August 17, 2009). ; http://dx.doi.org/10.1117/1.3204687


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