Title :
Recent low temperature SQUID developments
Author_Institution :
Physikalisch Tech. Bundesanstalt, Berlin, Germany
Abstract :
Magnetometers based on superconducting quantum interference devices (SQUID´s) fabricated from low (liquid helium) temperature superconductor materials are currently the most sensitive devices for measuring weak magnetic fields. A major application of low temperature SQUID´s is in biomagnetism where multichannel systems with around 100 channels are required. The recent world-wide effort to develop biomagnetic multichannel systems has stimulated both the sophistication of existing SQUID concepts and the development of novel SQUID concepts optimized for biomagnetic applications. The latest SQUID designs are reviewed and their merits are evaluated. Both the noise and the dynamic behavior are discussed and a fair quantitative comparison between the different SQUID concepts is given.<>
Keywords :
SQUIDs; biomagnetism; electron device noise; magnetometers; biomagnetism; dynamic behavior; liquid helium temperature; low temperature SQUIDs; magnetometers; multichannel systems; noise; superconductor materials; weak magnetic field measurement; Biomagnetics; Interference; Magnetic field measurement; Magnetic liquids; Magnetic materials; SQUID magnetometers; Superconducting devices; Superconducting materials; Temperature sensors;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
