A Noncontact Method for Measuring the Specific Electrical Resistance of Metals in the High-Temperature Region

Resumo

An extremely simple noncontact method for measuring the resistivity of metals at high temperatures is proposed. The essence of this method is to measure the electromotive force induced by a high-frequency electromagnetic field in two circular circuits of different diameters, which are placed coaxially in the middle of a cylindrical sample. The results of measuring the resistivity of molybdenum in the range of 1170–2070 K using contact and noncontact methods coincide within ±1%, thus making it possible to recommend the proposed method as efficient and preferable, especially in the high-temperature region. A technique for processing the experimental results is described and recommendations on the optimal geometries of the circuits and sample are given to improve the accuracy of measurements.