Analysis of the environmental magnetic noise rejection by using two simple magnetoelectric sensors

Ying Shen (1) , Junqi Gao (1) , Liangguo Shen (1) , D. Gray (2) , Jiefang Li (1) , Peter Finkel (3, 4) , Dwight Viehland (1) , Xin Zhuang (5) , Sebastien Saez (5) , Christophe Dolabdjian (5)

1 MSE - Department of Materials Science and Engineering [Blacksburg]
2 IESL - Institute for Electronic Structure and Laser
3 Naval Undersea Warfare Center
4 NRL - Naval Research Laboratory
5 Equipe Electronique - Laboratoire GREYC - UMR6072

We have evaluated the performance of a classical differential technique to reject magnetic or, in a lesser extent, the vibrational coherent noise sources sensed by two identical magnetoelectric (ME) laminated sensors with the help of a data logger. The signals of two ME sensors were directly subtracted given highly homogeneous external noise. Through a signal processing technique, the intrinsic noise of the ME sensor systems was obtained to be 20 pT/√Hz with a rejection factor of the external homogeneous noise sources of 20. The latter is mainly limited, as theoretical described, by the incoherent noise and discrepancy between the sensors. To demonstrate the efficiency of this technique by using ME sensors, internal noise tests were also performed in a magnetic shielding chamber for individual ME sensor and shown to be close to that of the sensors in an open environment

Mots clés: Magnetic noise; Magnetoelectric senssors

Domaines: Electronique

Ying Shen, Junqi Gao, Liangguo Shen, D. Gray, Jiefang Li, et al.. Analysis of the environmental magnetic noise rejection by using two simple magnetoelectric sensors. Sensors and Actuators A: Physical , 2011, 171, pp.63-68. ⟨hal-01061680⟩