A mathematical model of an acoustoelectric transducer based on the use of the electrokinetic phenomenon of the flow potential is proposed. It is shown theoretically that the flow potential increases in proportion to the strength of the constant electric pumping field, which is confirmed experimentally. The described converter has variable sensitivity. Rather large values of the sensitivity of an electrokinetic microphone have been obtained experimentally. The results of the work can be used in the design of acoustoelectric transducers. Keywords: Acoustoelectric conversion, Electrokinetic phenomena, Current potential, Flow potential hydrodynamics, Energy pumping. Electrokinetic microphone sensitivity.

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The features of the flow potential in the electrolyte that are significant for implementing a liquid acousto-electric converter are presented. The electrochemistry of the flow potential in electrolytes is considered. The peculiarities of the process in the electrolyte solutions associated with the influence of the ion strength of the electrolyte and its dependence on the electrokinetic radius are noted. It is shown that at small values of the electrokinetic radius, the effect of overlapping the electric double layer occurs, leading to a sharp decrease in the absolute values of the flow potential and, consequently, to the practical impossibility of implementing the acoustoelectric transformation. The results obtained can find wide practical application.