KEYWORDS: Digital holography, Holography, Sensors, Speckle, Data modeling, Holographic interferometry, Doppler effect, Point spread functions, Holograms, 3D image reconstruction
This paper discusses on the analytical modeling of the speckle decorrelation noise in digital Fresnel holographic interferometry. The complex coherence factor between two images from two digitally reconstructed holograms at two different instants is analyzed. The modulus of the coherence factor is established and depends on the local surface deformation. The main influencing parameters of the holographic set-up are discussed. Experiments confirm the validity of the proposed modelling.
This paper discusses on a full and large field, high spatial resolution, contact-less, and non-intrusive approach for force retrieval at different excitation regimes of mechanical structures. The inverse problem based on the Force Analysis Technique is combined with the full-field measurement to identify the force applied to a structure, in terms of localization and quantification. In the transient regime, the proposed approach is able to retrieve the time dependence of the force and yields good agreement with that from a piezoelectric force sensor.
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