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Saber A, Tavassoly M T. Measuring of diffusion coefficient of liquids using Fresnel diffraction from phase step. ICOP & ICPET _ INPC _ ICOFS 2015; 21 :1053-1056
URL: http://opsi.ir/article-1-527-en.html
URL: http://opsi.ir/article-1-527-en.html
1- University of Mohaghegh Ardabili
2- University of Tehran
2- University of Tehran
Abstract: (3677 Views)
The diffusion coefficient of liquid-liquid has been measured using the Fresnel diffraction from a phase step. As a phase step in transmission mode, a glass plate is immersed in the diffusion cell. The plate is illuminated by a monochromatic parallel beam of a He-Ne laser and the diffraction pattern which is formed on a surface perpendicular to the beam propagation direction is recorded using a CCD. During the diffusion process, the refractive index distribution inside the diffusion cell varies by time and changes the intensity distribution on the diffraction pattern. The Fourier transform method is used to find the phase distribution and the refractive index profile which provides the diffusion coefficient.
Keywords: Diffusion coefficient, Fresnel diffraction, Phase measurement, Phase step, Refractive index
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