Determination of Diffusion Coefficient of Transparent Solutions using Moire Defelectometery
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Date
2007-07
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Addis Ababa University
Abstract
In this thesis the Moire’ Defelectometery technique is applied to the investigation
of diffusion dynamics in transparent liquid mixtures.It describe the theoretical
analysis for obtaining the magnitude of diffusion coefficient using moire’ fringe
patterns.The theoretical aspect of methods are presentes the relationship between
the moire’fringe shift and diffusion coefficient.Based on moire’ effect, the displacement
(moire’ fringe shift position) can be used to calculate deflection angle of laser
beam,which is induced by the variation of refractive index.The physical and mathematical
model of laser moire’ defelectometery is presented in detail.
In diffusion of high concentration sugar solution the formation of dense layer above
the initial boundary of two liquids was observed. This may be related to so-called
baro-diffusion effect- influence of gravity on diffusant molecules , that forms ,the up
ward motion of sugar molecules are balanced by gravity.
Key Words : Moire’Deflectomrtery,Fringe Projection,Moire’Fringes ,Grating,
Moire’Fringes, Index of Refraction, Moire’fringe shift
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Keywords
Moire Deflectomrtery, Fringe Projection, Moire’Fringes, Grating, Index of Refraction, Moire’fringe shift