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Saber A, Golmohamadi S. Study of diffusion in liquids using Fresnel diffraction from the edge of a phase wedge. ICOP & ICPET _ INPC _ ICOFS 2018; 24 :717-720
URL: http://opsi.ir/article-1-1442-en.html
URL: http://opsi.ir/article-1-1442-en.html
1- University of Mohaghegh Ardabili
Abstract: (2640 Views)
In this paper the Fresnel diffraction pattern from the edge of a phase wedge is used to measure the diffusion coefficient of liquids. The diffraction pattern of the wedge contains oblique fringes of equal spacing when its surrounding medium is homogeneous. If the wedge is installed in a cell containing the diffusion liquids, the diffraction fringes of the inhomogeneity of the diffusion media are modulated in the wedge fringes. The diffraction pattern is recorded using a CCD and stored in a computer. The fringes are analyzed using the Fourier transform method and their phase distribution are derived. The refractive index profile inside the diffusion cell is calculated and the diffusion coefficient is derived. For diffusion of sucrose-water solution of 2% and water we derived the diffusion coefficient as D=(0.48 +0.02)*10-5 cm2/s.
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