Holographic Interferometry Measurement of Diffusion Coefficient

Holographic Interferometry has considerably broadened our traditional perception of Interferometry. It is concerned with the formation and interpretation of fringe patterns, which appear when a wave generated at some earlier time and stored in a hologram is later reconstructed by interfering with a comparison wave. Diffusion in transparent mixtures can conveniently be studied by means of Holographic Interferometry. I have studied the diffusion process of 0.5 N and 1 N methanol solutions. I have obtained distinct and well resolved interference fringes that are used for determining diffusion coefficients. It is observed that as the concentration of solution decreases the values of diffusion coefficients increases by very small amount. As diffusion progresses the diffusing boundary between the two solutions increases. The method gives reasonable agreement with the other methods.