New optical techniques for diffusion studies in transparent liquid solutions

Time evolution of diffusion fringes in the Christiansen effect

“…It may be noted that the type of diffusion fringes and their time evolution have observed in connection with Christiansen experiment are not reported in any of the earlier works. However, in a recent work the method of multiple beam intererometry has been used to determine diffusion coefficient [21]. The types of fringes observed by these workers are attributed to the change in the path traveled by the incident light with its position inside the experimental cell.…”

Measurement of diffusion coefficient of transparent liquid solutions using Michelson interferometer

“…The free diffusion process is governed by Fick's second law, and for onedimensional diffusion along z-axis it is given by [11][12][13][14][15] where Cðz; tÞ is the concentration at z at time t; D is the diffusion coefficient and z is the direction of diffusion. The solution of Eq.…”

“…But the main limitation was the determination of the extreme points in the interferogram. In this paper a new technique using Michelson Interferometer is reported to measure the diffusion coefficient of transparent liquids [13]. The advantage of this technique is that it does not need a recording medium and that the shift in the interferogram is easily identifiable.…”

A New Method of Processing Mach–Zehnder Interference Fringe Data in Determination of Diffusion Coefficient

“…The mass diffusion coefficient introduced by the second Fick's law is a basic thermophysical property in the field of mass transfer, and it represents the fluid's capacity of diffusion [1][2][3]. It is the basis of the research on the phenomenon of mass diffusion by experiment and by theoretical calculations [4,5].…”