Use of laser interferometry for the research of concentration polarization in pressure-driven membrane processes

A brief characterization is given to the interferometric method for concentration polarization research. The effect of the diffusion coefficient on the characteristics of a concentration boundary layer is demonstrated. For exponential and parabolic models of the boundary layer, solutions to the light beam trajectory equation are proposed. For various values of the optical density gradient and the width of the object under investigation, the heights of an invisible section arising from deviation of a beam passing through the boundary layer are determined.