Precision of an eddy current sensor with magnetic circuit losses

This paper describes an inductive magnetic sensor for the translation measurement of a metal sheet during the drop-stamping process. This electromagnetic sensor consists of a cast-iron core coil sensor. The classical coil system approach does not include the eddy current effect in the transducer core. The main feature of this paper is to define the eddy current effect on the cast-iron core by means of an analytical study and propose an electric model of the sensor. The theoretical study has led to an important improvement of the sensitivity of the sensor which allows amplifier gain minimisation and improves the precision of the measurement