Development of a fast and reliable system for the automatic characterization of Giant magnetoimpedance samples

Abstract

Giant Magnetoimpedance (GMI) magnetometers are one of the most recent families of magnetic transducers, being characterized by their potential to achieve high sensitivities. The sensitivity of magnetic transducers is directly related to the sensitivity of its sensor elements. Thus, optimizing the sensitivity of these sensor elements is a critical part of the magnetometers development chain. This paper describes an automatic characterization system designed for the measurement of the electrical impedance of Giant Magneto- Impedance samples. The measurement uncertainties of the system were verified and discussed. The high speed of measurement attained with the use of this system, implemented in LabVIEW, allows for the rapid determination of the optimal operational point of GMI magnetometers.

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].…”

Oscilador Eletrônico De Alta Sensibilidade Controlado Por Campo Magnético

“…A amostra utilizada foi caracterizada experimentalmente a fim de se obter as curvas que descrevem o comportamento de R A e L A com H, para diversas frequências da corrente de excitação [3].…”

Homogeneização Das Características De Fase De Amostras Gmi Para Leitura Gradiométrica

“…Integrantes do LaBioMet desenvolveram um sistema automático de caracterização de amostras GMI [7] e [8]. A excitação da amostra é realizada por um Medidor RLC (Agilent -4285A), que também obtém os valores de módulo e fase de impedância da mesma.…”