In the holographic interferometry setup, we are able to record the fringe, which is in line andare of the same phase difference between the waves coming out of the diffusion cell at two different times. The interferogram fringes have a distinctive form with two extremes. A given fringe's deflection is proportional to the time difference between concentrations. We essentially measure the time difference of the extremes of a given concentration profile. Sandwich holography setup allows for two exposures on two separate holographic plates, which are then combined in a plate holder, and an image is reconstructed from a sandwichholograph. It exhibits the same fringe pattern as a normal double exposure hologram, but because the images are on two distinct plates, the fringe pattern may be manipulated by rotating and tilting the sandwich pair. This enables better accuracy compared to the other holographic methods.