Modelling and experimental study of an electromagnetic sensor with an H-shaped ferrite core used for monitoring the hot transformation of steel in an industrial environment

This paper presents a modelling and experimental study on an H-shaped ferrite core electromagnetic sensor for phase transformation detection in steel rolling and controlled cooling applications. It has been found that the response of the H-shaped sensor after normalisation can be described by a simple analytical model. Further, it has been found that the zero-crossing frequency for the real part of the inductance spectra and the peak frequency of the imaginary part of the inductance spectra are linearly proportional to the magnetic permeability of the steel strip under test. These findings are helpful in understanding the response of the EM sensor in an industrial set-up and possibly lead to more accurate determination of steel magnetic properties and hence characterise the micro-structural properties.

► The response of sensor after normalisation can be described by a simple analytical model.
► The zero-crossing frequency and the peak frequency of the inductance spectra are linearly proportional to the magnetic permeability.
► These findings are helpful in understanding the response of the EM sensor in an industrial setup.
► Accurate determination of steel magnetic properties and characterisation of the micro-structural properties can be obtained.