Multiplexed SQUID vectormagnetometer for biomagnetic research

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Abstract
A three-channel SQUID vectormagnetometer for biomagnetic studies is developed. The system is realised by using multiplexing where one of the three SQUIDS is monitored at a time. The system maintains continuously all the SQUIDS in the flux-locking condition. The construction of a gradiometer for recording the magnetic heart vector with the unipositional lead system is described. A low-noise, high-input impedance preamplifier and an RF-switch with nearly ideal properties at low signal levels are constructed and tested. The noise properties of the magnetometer system are estimated and measured. The usefulness of this vectormagnetometer is demonstrated by measuring the magnetic heart vector in real time from several healthy subjects. Two examples of these registrations are presented.
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