The authors have improved the properties of their eddy current shield by equipping it with an active compensation system to cancel the static and low-frequency magnetic field. The performance of the compensation system is measured very accurately. These measurements and the measurement of biomagnetic fields show that an eddy-current shield with an active shielding is a practical solution for clinical biomagnetic measurements because of its low cost and the small space it needs.
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Malmivuo et al. (1987) studied this question.
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