Investigation of dynamic of unconsolidated materials using two-color digital holography
LAUM CNRS, Université du Maine, Avenue Olivier Messiaen,
LE MANS Cedex 9,
2 École Nationale Supérieure d’Ingénieurs du Mans, rue Aristote, 72085 Le Mans Cedex 9, France
3 LPEC CNRS, Université du Maine, Avenue Olivier Messiaen, 72085 LE MANS Cedex 9, France
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The paper presents a two-color digital holographic interferometer. The set-up is devoted to the study of the fundamental dynamic of unconsolidated materials. Optical configuration and algorithms to recover the optical phase of two-color digitally encoded holograms are described. The method is based on a spatial-color-multiplexing scheme in which holographic reconstruction is performed using adapted wavelength zero-padding and reconstructing distance. Experimental results are presented in the case of granular media excited in the frequency range 400Hz-3000Hz and exhibits the 3D movement.
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