Superconducting quantum interference device-based sensor assembly for absolute measurement of magnetic flux, has superconducting quantum interference devices, which are arranged, such that similar measuring of magnetic field is performed

摘要

The superconducting quantum interference device (SQUID)-based sensor assembly has a SQUID arrangement having feedback electronic (3). A relatively insensitive reference-SQUID (4) with associated feedback coil (5) and a sensitive measuring-SQUID (1) with associated feedback coil (2) are arranged such that SQUIDs are subjected to similar measuring of a magnetic field. The area (A-ref) of the SQUID forming the reference is measured so small that its output characteristic according to its associated servo loop differentiates the difference of two adjacent operating line of sensitive magnetometer.