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Appl Opt. 2005 Jan 20;44(3):337-43.

Some opportunities for vibration analysis with time averaging in digital Fresnel holography.

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  • 1Ecole Nationale Sup√©rieure d'Ing√©nieurs du Mans, rue Aristote, 72085 Le Mans 9, France. pascal.picart@univ-lemans.fr

Abstract

Features offered by the combination of time averaging and digital Fresnel holography are investigated. In particular, we introduce the concept of the zero-crossing phase of Bessel fringes, which allows a highly contrasted determination of the dark fringes in the hologram. We discuss some particularities of the digital reconstruction and show how time-averaged digital holography can be used to study vibration drifts. Experiment results are presented in the case of a loudspeaker under a sinusoidal excitation; digital and analogical holography are also compared.

PMID:
15717822
[PubMed]
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