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Lensless Fourier transform digital holographic interferometer for diffusivity measurement of miscible transparent liquids.

Lensless Fourier transform digital holographic technique is applied for measurement of diffusion in miscible transparent liquid solutions. The phase information at two time instances and a synthetic plane wavefront is used to determine the diffusion coefficient. The experiment was conducted to measure the diffusion coefficient of aqueous solution of NaCl in water. The measured values of diffusion coefficient deviates approximately 1.06% from the values given in literature.