Theoretical Fundamentals of Three-Parameter Testing of a Hardened Layer by an Asymmetric Electropotential Quasi-DC Probe: I. HL Model

Abstract

A model of a hardened product in the form of half-space with piecewise linear variation of the specific resistance as a function of the depth in the surface layer is considered. The problem of the electrical potential distribution on the surface of the half-space is solved for a point supply of a low-frequency current to the half-space. An effective algorithm of solving the inverse problem of determining the layer parameters on the basis of the voltages measured on the surface is proposed. The possibility of testing cemented and nitrated layers of steel products by a probe with equidistant potential electrodes is investigated.