Fabrication, caractérisation et application des capteurs de courant sans contact à base de matériaux magnétoélectriques composites.

A material exhibits a direct magnetoelectric effect when its electric polarization change upon application of a magnetic field. Current sensors based on this effect offer a good tradeoff between sensitivity and cost. However, their development for industrial applications is limited by certain constraints. In particular, the bandwidth's high limit is restricted due to the composite's mechanical resonance, and the sensor is sensitive to electric field disturbances.In this work, we study the fabrication of magnetoelectric composites by electrodeposition of nickel on PZT substracts to miniaturise the composites and reject the mechanical resonance to higher frequencies.A sample is then used as an AC current sensor with a simple electronic circuit to minimise sensitivity to electrical field disturbances. Its performance is characterised and a study is conducted on its sensitivity to these disturbances, resulting in the sensor being shielded.Finally, the composite resonance is damped with polyurethane mixed with tungsten powder without introducing a phase shift on measurements. A theoretical study is also conducted and compared to experimental results.