Optical interferometry is one of the several techniques available for diffusivity determination. The theoretical basis of using an interferometry approach for diffusivity determination is based on the fact that the concentration distribution alters the optical path length of light travelling through a material during a diffusion process, resulting in the formation of fringes. These fringes are collected either manually or electronically using specific instruments. By interfering with a reference beam, the information stored in the interference pattern may be utilized to rebuild the concentration distribution and hence the diffusion coefficient.