A modular low noise 7-channel SQUID-magnetometer
作者： O. Dossel , B. David , M. Fuchs , W.H. Kullmann , K. Ludeke
DOI: 10.1109/20.133790
关键词:
摘要: A modular low-noise seven-channel SQUID-magnetometer for biomagnetic measurements was developed. The DC-SQUIDs are prepared by thin film technology based on the materials NbN-MgO-NbN, and show a flux noise below 10 mu Phi /sub 0// square root Hz. signal is picked up with first-order wire-wound gradiometers of 2-cm diameter coupled to SQUIDs integrated coupling coils. Individual channels can be replaced from system, various used giving flexible system. electronics flux-locked-loop method extended bias modulation technique reduce 1/f noise. overall system 20 fT/ Biomagnetic auditory evoked fields have been carried out.
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