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Determination of electrical conductivity of high temperature melts, using an inductive difference measurement procedure
Author(s) -
Friedrichs Hans Adolf,
Goldkamp Markus
Publication year - 1996
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199605500
Subject(s) - electrical resistivity and conductivity , conductivity , displacement (psychology) , tin , thermodynamics , differential equation , analytical chemistry (journal) , chemistry , materials science , physics , electrical engineering , mathematical analysis , metallurgy , mathematics , engineering , chromatography , psychology , psychotherapist
An inductive measurement procedure based on difference measurements has been designed, which enables the conductivity of high temperature metal melts (e.g. iron and steel melts) to be derived. With the elimination of disturbance factors on the primary side, uncertainties due to the apparatus can be largely avoided. This is reinforced by the principle of inductive measurement. Since current displacement effects have to be taken into consideration where materials of increased conductivity have to be measured, a mathematical model has been developed, which offers a direct link between the measured data and the conductivity of metal melts. This avoids the problems associated with calibration. The model delivers the field equations, necessary for a theoretical description of a given measuring arrangement. The closed solutions to the eliptical differential equations show that the choice of boundary conditions for solving the equation system exerts a marked influence on the convergence behaviour in the numerical integration. The series of tests on a tin melt confirmed the validity of the mathematical model. It is also apparent that the influence of current displacement has only to be considered at higher frequencies and conductivities.