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ICOP & ICPET 2018, 24 - : 717-720 Back to browse issues page
Study of diffusion in liquids using Fresnel diffraction from the edge of a phase wedge
Ahad Saber * 1, Sahar Golmohamadi 1
1- University of Mohaghegh Ardabili
Abstract:   (352 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.
Keywords: Diffusion coefficient, Fresnel diffraction, Phase step, Refractive index
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Type of Study: Research | Subject: Special
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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. 2018; 24 :717-720
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Volume 24 - Back to browse issues page
انجمن اپتیک و فوتونیک ایران Optics and Photonics Society of Iran
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