Abstract
Non-contact measurement of electrical resistivity of sheet metal at high temperatures © A.V. Rumyantsev, M.A. Nikishin, A.P. Sinitsin Immanuel Kant Baltic Federal University, 236041 Kaliningrad, Russia e-mail: albert37@list.ru The developed non-contact method for measuring the electrical resistivity of metals at high temperatures is extended to sheet metal. The theoretical part of the method is supplemented by solving the problem of the power introduced into the sample in the form of a thin-walled cylinder during its induction heating. The essence of the method is the measurement of electromotive forces (EMF) induced by a high-frequency electromagnetic field in two circular contours of different diameters, coaxially located with a cylindrical specimen. The obtained formula for the power introduced into the thin-walled cylinder made it possible to find a function linking the electrical resistivity of the sample material and EMF. From the EMF measured in the experiment, the specific electrical resistance of the sample under study was determined and, as a consequence, the value of the power introduced into the sample. The latter allows one to determine the hemispherical integral degree of blackness of the sample material. The results of an experimental verification of the method on a sample in the form of a thin-walled niobium cylinder are presented. The data obtained within 3% are consistent with the data of other authors, which allows us to recommend the technical use of the method. The experimental techniques for implementing the method and processing its results are presented. Keywords: electrical resistivity, electromagnetic field, electromotive force, skin-layer, sheet metal, high temperature, thin-walled cylinder, power. Rumyantsev A.V. − PhD, professor, I. Kant Baltic Federal University, IKBFU, A. Nevskogo str.14, Kaliningrad, 236041, Russia. E-mail: albert37@list.ru Nikishin M.A. – PhD postgraduate student, I. Kant Baltic Federal University,IKBFU, A. Nevskogo str.14, Kaliningrad, 236041, Russia. E-mail: nikishin.maxim.a@gmail.com Sinitsin A.P. – PhD postgraduate student, I. Kant Baltic Federal University, IKBFU, A. Nevskogo str.14, Kaliningrad, 236041, Russia. E-mail: alekseisinitcin82@yandex.ru
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