Gradiometer integrating pickup coils and magnetic field measurement system
US6665552B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2001 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Oct 28, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/0358
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gradiometer integrating pickup coils comprises pickup coils 11Xp, 11Xn magnetically connected to a SQUID through associated input coils 2, and pickup coils 11Yp, 11Yn magnetically connected to a SQUID through associated input coils 2, respectively. Two superconducting loops are connected in series to each of the SQUIDs, when viewed from Josephson junctions 5. The input coils 2 form superconducting closed loops together with the pickup coils 11Xp, 11Xn, 11Yp, 11Yn associated therewith. The SQUIDs are respectively connected to form an 8-figured shape as a whole such that currents flow in two superconducting loops of each SQUID in opposite directions to each other, with respect to the application of a uniform field, in order to reduce environmental magnetic field noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.