Speckle noise suppression in shape and deformation measurements by phase-shifting digital holography

Ichirou Yamaguchi

doi:10.1117/12.814549

3 October 2008 Speckle noise suppression in shape and deformation measurements by phase-shifting digital holography

Ichirou Yamaguchi

Proceedings Volume 7155, Ninth International Symposium on Laser Metrology; 71551D (2008) https://doi.org/10.1117/12.814549
Event: Ninth International Symposium on Laser Metrology, 2008, Singapore, Singapore

Abstract

A new algorithm of data 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 has been shown that the algorithm is much more immune to speckle noise in phase analysis and unwrapping than conventional methods.

Citation Download Citation

Ichirou Yamaguchi "Speckle noise suppression in shape and deformation measurements by phase-shifting digital holography", Proc. SPIE 7155, Ninth International Symposium on Laser Metrology, 71551D (3 October 2008); https://doi.org/10.1117/12.814549

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