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Autori: Irina Robu and Erhard Rothe
Editorial: in press, Journal of Flow Visualization and Image Processing, 2005.
We describe the creation of sets of 633-nm beamlets and their bending by supercritical CO2. Small temperature gradients within a cell that contains the fluid resulted large density-gradients that, in turn, are almost proportional to gradients of optical refractive index. The paths of such beamlets can be described quantitatively. Beamlets were made with a He-Ne laser-beam that impinged on an array of apertures. The transmitted light forms Fraunhofer diffraction patterns whose shapes depend upon the arrangement of the apertures. The beamlets traversed a 7.62 cm-long cell and were deflected downward to a degree that depended upon the spatial distribution of CO2 density. The deflection is as much as 0.25m at a distance of 2m.
Cuvinte cheie: Diffraction patterns, supercritical CO2