Automatic Shielding-Shimming Magnetic Field Compensator for Excluded Volume Applications

Author

Forte, Guillermo O. ; Farrher, Germán ; Canali, Luis R. ; Anoardo, Esteban

Author_Institution

Grupo de Resonancia Magnetica Nucl., Univ. Nac. de Cordoba, Cordoba, Argentina

Volume

18

Issue

4

fYear

2010

fDate

7/1/2010 12:00:00 AM

Firstpage

976

Lastpage

983

Abstract

We discuss the problem of automatic magnetic field compensation within an excluded volume where the magnetic field cannot be sensed in a direct way. Both magnetic field spatial average (shielding) and first order orthogonal gradients (shimming) are considered. The active shielding-shimming compensator is based on a multiple-input multiple-output controller driving a specifically designed coil-set. The magnetic field and its gradients are calculated from the readings of ten hall sensors located outside the exclusion volume.

Keywords

MIMO systems; gradient methods; magnetic sensors; magnetic shielding; nuclear magnetic resonance; excluded volume application; first order orthogonal gradients; hall sensors; magnetic field spatial average; multiple-input multiple-output controller; shielding-shimming magnetic field compensator; Active shielding; active shimming; excluded volume; fast field cycling nuclear magnetic resonance (FFC-NMR); magnetic field compensation; multiple-input multiple-output (MIMO) control;

fLanguage

English

Journal_Title

Control Systems Technology, IEEE Transactions on

Publisher

ieee

ISSN

1063-6536

Type

jour

DOI

10.1109/TCST.2009.2030174

Filename

5282506