V Congreso Latinoamericano de Ingeniería Biomédica (CLAIB2011)

Progress Toward a Hundredfold Enhancement in the Impedance Phase Sensitivity of GMI Magnetic Sensors aiming at Biomagnetic Measurements
Eduardo Costa da Silva, Luiz Antônio Pereira de Gusmão, Carlos Roberto Hall Barbosa, Elisabeth Costa Monteiro

Última modificación: 2011-04-13 08:53

Resumen


Over the last decade, Giant Magnetoimpedance (GMI) sensors have been intensively studied as a new possibility for measuring ultra-weak magnetic fields. Pursuing the measurement of biomagnetic fields, this paper presents a newly developed method that allows the achievement of about a hundredfold enhancement in the impedance phase sensitivity of GMI sensors and, consequently, increases the sensitivity of phase-based GMI magnetometers. Also, the electronic circuit implemented to realize the proposed method is presented and discussed, and the obtained experimental results are shown.