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The work is devoted to development and creation of an optoelectronic complex for determination of the inhomogeneous condensed media parameters, principle of which is based on the method of structured laser radiation caustics. This method is described for determining the parameters of diffusion layer of liquid according to the position of caustic surfaces during longitudinal probing by a plane laser beam. Special software is presented that allows determining the distribution of the refractive index in the diffusion layer of liquid by comparing theoretically calculated and experimental refractograms. The results of the complex operation for the diffusion layer arising between the electrolyte solution and water for different concentrations of the electrolyte solution are shown. New method for determining the temperature of the surface of a cold body placed in a transparent liquid is presented, it is based on determining the location of the singular points of caustic surfaces arising when the boundary layer is probed by the horizontal element of structured beam.

The paper describes the principles of the surface plasmon resonance imaging method in application to investigation of heat and mass transfer processes. It is shown, that one the main obstacles to increase its sensitivity is low signal-to-noise ratio due to speckles and stray interference structures in the experimental images. An algorithm of image processing is developed to overcome this obstacle. Several ways to do it is discussed in the paper.