WO1995007470A3 - Improved squid coupling structure - Google Patents

Improved squid coupling structure Download PDF

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Publication number
WO1995007470A3
WO1995007470A3 PCT/US1993/008496 US9308496W WO9507470A3 WO 1995007470 A3 WO1995007470 A3 WO 1995007470A3 US 9308496 W US9308496 W US 9308496W WO 9507470 A3 WO9507470 A3 WO 9507470A3
Authority
WO
WIPO (PCT)
Prior art keywords
loop
squid
feedback
ground plane
coupling structure
Prior art date
Application number
PCT/US1993/008496
Other languages
French (fr)
Other versions
WO1995007470A2 (en
Inventor
Mark S Colclough
Original Assignee
Conductus Inc
Mark S Colclough
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Conductus Inc, Mark S Colclough filed Critical Conductus Inc
Priority to PCT/US1993/008496 priority Critical patent/WO1995007470A2/en
Priority to AU51264/93A priority patent/AU5126493A/en
Priority to US08/403,728 priority patent/US5600243A/en
Publication of WO1995007470A2 publication Critical patent/WO1995007470A2/en
Publication of WO1995007470A3 publication Critical patent/WO1995007470A3/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/035—Measuring direction or magnitude of magnetic fields or magnetic flux using superconductive devices
    • G01R33/0354—SQUIDS
    • G01R33/0356—SQUIDS with flux feedback

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Magnetic Variables (AREA)
  • Superconductor Devices And Manufacturing Methods Thereof (AREA)

Abstract

A coupling structure is disclosed for coupling a feedback signal to a superconducting quantum interference device (SQUID) by mutual inductance. In one embodiment the SQUID loop (A) is shielded from external magnetic fields perpendicular to it by a superconducting ground plane (B) at all points except for the pick-up loop (C). A feedback signal is coupled to the SQUID loop (A) by a feedback loop (D) which has a mutual inductance with the SQUID loop (A). During operation, the feedback loop (D) conducts a current in only one direction around the SQUID loop (A). This geometry ensures that the SQUID loop (A) is shielded from external magnetic fields, except at the pick-up loop (C), by the ground plane, and is balanced against fields parallel to the ground plane. The magnetic field produced by the current in the feedback coil (D) is small far from the SQUID (A). The feedback loop (D) is connected to exterior feedback electronics.
PCT/US1993/008496 1993-09-07 1993-09-07 Improved squid coupling structure WO1995007470A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/US1993/008496 WO1995007470A2 (en) 1993-09-07 1993-09-07 Improved squid coupling structure
AU51264/93A AU5126493A (en) 1993-09-07 1993-09-07 Improved squid coupling structure
US08/403,728 US5600243A (en) 1993-09-07 1993-09-07 Magnetically shielded magnetic sensor with squid and ground plane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1993/008496 WO1995007470A2 (en) 1993-09-07 1993-09-07 Improved squid coupling structure

Publications (2)

Publication Number Publication Date
WO1995007470A2 WO1995007470A2 (en) 1995-03-16
WO1995007470A3 true WO1995007470A3 (en) 1995-06-08

Family

ID=22236935

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/008496 WO1995007470A2 (en) 1993-09-07 1993-09-07 Improved squid coupling structure

Country Status (2)

Country Link
AU (1) AU5126493A (en)
WO (1) WO1995007470A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19511172C2 (en) * 1995-03-28 1999-09-02 Forschungszentrum Juelich Gmbh rf-SQUID with tank circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0313132A2 (en) * 1987-10-22 1989-04-26 Philips Patentverwaltung GmbH Device for multichannel measuring of weak magnetic fields
EP0327123A2 (en) * 1988-02-05 1989-08-09 Hitachi, Ltd. Superconducting quantum interference device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0313132A2 (en) * 1987-10-22 1989-04-26 Philips Patentverwaltung GmbH Device for multichannel measuring of weak magnetic fields
EP0327123A2 (en) * 1988-02-05 1989-08-09 Hitachi, Ltd. Superconducting quantum interference device

Also Published As

Publication number Publication date
WO1995007470A2 (en) 1995-03-16
AU5126493A (en) 1995-03-27

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