Automatic shielding-shimming magnetic field compensator for excluded volume applications

GUILLERMO O. FORTE; GERMAN D. FARRHER; LUIS R. CANALI; E. ANOARDO

IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Año: 2010 p. 976 - 983

1063-6536

We discuss the problem of automatic magnetic fieldcompensation within an excluded volume where the magneticfield cannot be sensed in a direct way. Both magnetic field spatialaverage (shielding) and first order orthogonal gradients (shimming)are considered. The active shielding-shimming compensatoris based on a multiple-input multiple-output controller driving aspecifically designed coil-set. The magnetic field and its gradientsare calculated from the readings of ten hall sensors located outsidethe exclusion volume.