By I. Naydenova
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2001). Schlieren and shadowgraph techniques, Springer-Verlag, Berlin Heidelberg New-York, ISBN 3-540-66155-7 Smeets, G. ((1975). Observational techniques related to differential interferometry, In: Proceeding of 11th International Congress on High Speed Photography, Chapman & Hall, UK, pp. , Fagot, H. & Albe, F. (1976). Application de l’holographie ultra rapide à référence arrière à l’étude de déformations dynamiques, Proceeding of the 12th International Congress of High Speed Photography, Toronto Surget, J.
The complex amplitude of the brightness at each pixel on the hologram is calculated using the phase-shifting method expressed in Equations (1) to (3). The reconstructed complex amplitude of the object wave at a point of the reconstructed object surface is calculated from the complex amplitudes of the holograms using the Fresnel diffraction integral expressed in Eq. (4). After the cantilever is deformed, the reconstructed complex amplitude of the object waves at the same point of the reconstructed object is obtained similarly.
6). When the background colour is uniform, it is very easy to follow the vortices emitted from the upper and lower side. For instance, if one looks at the colours coming out in the vortex cores, one can easily see that the first vortex emitted from the upper side enters a formation phase where the gas density decreases in the vortex centre. 720 1 0 -1 1 -1 0 1 2 3 4 x/D 0 1 2 3 4 x/D y/D 2 1 0 -1 -1 2 y/D 2 1 y/D 2 1 0 0 -1 -1 3 -1 0 1 2 3 4 0 x/D 1 2 3 4 x/D Fig. 12. Interferogram analysis : instantaneous and average gas density field – t = 117s observed looking at the last vortex leaving the observed field.
Advanced Holography - Metrology and Imaging by I. Naydenova