An electronic approach to homogenize the impedance phase characteristics of heterogeneous GMI sensors

Abstract

Over the last decade, Giant Magnetoimpedance (GMI) sensors have been studied as a new possibility for measuring ultra-weak magnetic fields. To achieve that goal, the employment and optimization of gradiometric configurations are a key factor to reduce the magnetic interference. The performance of GMI gradiometers is strongly related to the homogeneity of the impedance characteristics of the GMI samples. This work presents a method and corresponding electronic implementation to homogenize the phase characteristics of heterogeneous GMI samples, aiming at improving the performance of phase-based GMI magnetometers.

Introduction to the ACTA IMEKO issue dedicated to selected papers presented in the 18th IMEKO TC4 Symposium

“…An electronic approach to homogenize the impedance phase characteristics of heterogeneous GMI sensors is the subject of [9]. The authors present experimental results that demonstrate the effectiveness of the developed homogenization method.…”

High sensitivity giant magnetoimpedance (GMI) magnetic transducer: magnitude versus phase sensing

“…The Postgraduate Program in Metrology of PUC-Rio, through the research line in biometrology and in partnership with the Department of Physics of the Federal University of Pernambuco (UFPE), has been carrying out studies seeking the implementation of high sensitivity prototypes of magnetometers based on the giant magnetoimpedance (GMI) phenomenon [1][2][3][4][5][6][7][8][9][10].…”

“…This effect is a key factor in the sensitivity improvement. The analysis is detailed in section 2 [3][4][5][6][7][8][9][10].…”

Non-Ferromagnetic Metallic Foreign Body Detection by Eddy Currents

“…Several studies have been realized at the LaBioMet to explore the possibilities of the GMI effect [27][28][29][30][31][32][33]. Sample ribbons have been provided by the Federal University of Pernambuco (UFPE).…”

“…Projects were developed to characterize the sensitivity curves of GMI samples [27,28], amplify and homogenize the sensitivity curves of different samples [29,30,32] as well as the implementation of a functional gradiometer for measuring ultra-low magnetic fields [26]. Since the beginning, the possibility of using GMI sensors with better resolution and sensitivity for the foreign body locator has been considered [34].…”