15 September 1999 Digital speckle-metrology local investigations of sedimentation and surface effects in liquids
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Proceedings Volume 3825, Microsystems Metrology and Inspection; (1999) https://doi.org/10.1117/12.364299
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany
Abstract
Two digital speckle-metrology methods are being used for the study of two different phenomena in the field of fluid mechanics. With the out-of-plane digital speckle-pattern interferometry (DSPI), a first step is made in the study of the thermocapillary effect of air-liquid interface curvature changes (Marangoni effect). For the phase distribution evaluation a fast Fourier transform (FFT) based algorithm with additional carrier frequency -- spatial heterodyning (SpH) -- is used. In the experimental stage are registered the optical path changes in the liquid volume, due to the surface shape variations. Experimental results for two liquids (water and glycerin) at different temperatures are shown. The digital speckle-photography (DSPh) is used for the study of sedimentation velocity fields of thin suspensions. A 2D model (Hele-Shaw cell) of 3D flow is used. The developed software is based on the correlation method with unambiguous sign determination. This allows for a complete investigation of the sedimentation front instability. Experimental results are presented, showing velocity fields for different phases of the sedimentation -- emerging and development of 'fingering' and uniform sedimentation.
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Ilia Roussev, Todor Partalin, Evtim Toshev, Assen Choulev, Pavel I. Koulev, "Digital speckle-metrology local investigations of sedimentation and surface effects in liquids", Proc. SPIE 3825, Microsystems Metrology and Inspection, (15 September 1999); doi: 10.1117/12.364299; https://doi.org/10.1117/12.364299
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