Abstract
Ultra low-noise dc SQUIDS have been used to detect disturbances in biomagnetic measurements and to feed an active shielding system that compensates these disturbances. This work describes some properties of the SQUIDs used and the principle of active shielding that has been improved for frequencies from dc to 500 Hz. So far an additional attenuation of up to 50 dB for near-dc and almost 20 dB for 50 Hz magnetic disturbances has been achieved.
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