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Communication Dans Un Congrès Année : 2016

Structural Holography

Résumé

The objective is to reconstruct the displacement or velocity field on a plate-like structure by only measuring the displacement on a few lines (1 to 4). Thanks to 1D Fourier transform and to propagation operators the displacement is reconstructed back and forth from the hologram positions. The structural holography is a source separation technique and can be used to decompose the reconstructed field into incoming and outcoming waves. Compared to the acoustic operator, fourth-order differential equation of the Kirchhoff theory produces some waves purely evanescent whatever the wavenumber. Two versions of the structural holography are thus defined: a near field structural holography (NSH) and a far field structural holography (FSH) for which the purely evanescent waves are not taken into account. The structural holography theory will be illustrated on the ideal case of an infinite plate. Then, an experimental validation of this method will be shown and discussed.
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Dates et versions

hal-01474626 , version 1 (22-02-2017)

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  • HAL Id : hal-01474626 , version 1

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Corentin Chesnais, Nicolas Totaro, Jean-Hugh Thomas, Jean-Louis Guyader. Structural Holography. ISMA 2016, Sep 2016, Leuven, Belgium. ⟨hal-01474626⟩
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