Extremely sensitive super conducting quantum interference device constructed as a double-helix array

摘要

The instant invention increases the sensitivity of Josephson Junction Cryogenic Magnetometers by the use of stacked SQUID arrays. The SQUID sensitivity at each sensing point is increased by making an intimate, co-axial superposition of two or more two-junction DC SQUID loops, using evaporated thin-film technology although fabrication is not limited to this technology. The device permits multiple use of the SQUID loop area, thereby increasing the sensing volume and improving the coupling to the ambient magnetic field.