Device and method for compensating magnetic field distortions in magnetic fields with high field homogeneity

摘要

The device has a field detector (31) for detecting interfering signals, control loop for processing detected interfering signals, and compensation coil (34) to generate a correction field for compensating the interfering signals. A multi-selective filter system (35) has selective filter elements comprising center frequencies tuned to frequency values of the interfering signals to be compensated. Outputs of the filter elements are connected to one of the compensation coils, one of the field detectors, where tuning of the center frequencies of the system is effected in an adaptive manner. An independent claim is also included for a method for compensating field disruptions in magnetic fields of electromagnets.