Conductivity Measurements of Conducting Materials with the Use of Inductive Transducer in Digital Measurement System

Józef Kusmierz

Abstract

This paper presents a processing formula of an inductive transducer for conductivity measurements of conducting materials. On the basis of this formula, an analysis of metrological properties for a flow version of the transducer has been performed. This type of the transducer consists of a coil wound round an insulating pipe of which – coaxially with the coil – a cylindrical sample of investigated material is placed. The aforementioned processing formula of the transducer has the form of a dependence between – on the one hand – the changes of impedance observed at terminals of the coil and – on the other hand – conductivity of the material of the sample, geometrical structure of the transducer and frequency of power supply. This formula allows us to optimize the design of the transducer. The advantages resulting from theoretical analysis have been demonstrated in practical experiment carried out by means of digital measurement system.

Keywords

eddy currents, conductivity measurements, inductive transducer, mathematical model of transducer, digital measurement systems

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DOI

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IMEKO TC

TC7 - Measurement Science

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