WO2002027332A3 - High balance gradiometer - Google Patents

High balance gradiometer Download PDF

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Publication number
WO2002027332A3
WO2002027332A3 PCT/US2001/026306 US0126306W WO0227332A3 WO 2002027332 A3 WO2002027332 A3 WO 2002027332A3 US 0126306 W US0126306 W US 0126306W WO 0227332 A3 WO0227332 A3 WO 0227332A3
Authority
WO
WIPO (PCT)
Prior art keywords
gradiometer
winding
balance
maintain
loop areas
Prior art date
Application number
PCT/US2001/026306
Other languages
French (fr)
Other versions
WO2002027332A2 (en
Inventor
Alexander A Bakharev
Original Assignee
Cardiomag Imaging Inc
Alexander A Bakharev
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 Cardiomag Imaging Inc, Alexander A Bakharev filed Critical Cardiomag Imaging Inc
Priority to AU2002226874A priority Critical patent/AU2002226874A1/en
Publication of WO2002027332A2 publication Critical patent/WO2002027332A2/en
Publication of WO2002027332A3 publication Critical patent/WO2002027332A3/en
Priority to US10/375,939 priority patent/US20030141868A1/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
    • G01R33/0358—SQUIDS coupling the flux to the SQUID

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

High balance, in the range of about 4X10-4 to about 10-3, is achieved in a gradiometer using Pyrex as the gradiometer support material. A superior technique (400) is disclosed for winding superconducting wire loops with equal loop areas wherein cyanoacrylate glue (301, 302, 303) is used to reduce slack in the wire in the process of winding. Furthermore, a minimal number of turns for each gradiometer type are used to maintain gradiometer sensitivity and to maintain high degree of mechanical balance. Additionally, low sensitivity SQUID magnetometers with optimally selected loop areas are placed among gradiometer channels in the directions of x, y, and z to measure magnetic fields. These measured fields are then fed into the gradiometer with coefficients roughly equal to (-1) (inversion) to compensate for the imbalances in the x, y, and z direction.
PCT/US2001/026306 2000-08-29 2001-08-23 High balance gradiometer WO2002027332A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2002226874A AU2002226874A1 (en) 2000-08-29 2001-08-23 High balance gradiometer
US10/375,939 US20030141868A1 (en) 2001-08-23 2003-02-25 High balance gradiometer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US22864100P 2000-08-29 2000-08-29
US60/228,641 2000-08-29

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/375,939 Continuation US20030141868A1 (en) 2001-08-23 2003-02-25 High balance gradiometer

Publications (2)

Publication Number Publication Date
WO2002027332A2 WO2002027332A2 (en) 2002-04-04
WO2002027332A3 true WO2002027332A3 (en) 2002-08-08

Family

ID=22858026

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/026306 WO2002027332A2 (en) 2000-08-29 2001-08-23 High balance gradiometer

Country Status (2)

Country Link
AU (1) AU2002226874A1 (en)
WO (1) WO2002027332A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107919433B (en) * 2017-11-06 2019-10-18 中国科学院上海微系统与信息技术研究所 A kind of manufacturing device and method of the axial gradiometers of based superconductive connection

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5049818A (en) * 1989-03-04 1991-09-17 U.S. Philips Corporation Gradiometer for detecting weak magnetic fields including grooves carrying superconducting thin film conductors and method of making same
US5187436A (en) * 1992-03-13 1993-02-16 General Electric Company Noise cancellation method in a biomagnetic measurement system using an extrapolated reference measurement
US5901453A (en) * 1994-12-21 1999-05-11 Forschungszentrum Julich Gmbh Gradiometer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5049818A (en) * 1989-03-04 1991-09-17 U.S. Philips Corporation Gradiometer for detecting weak magnetic fields including grooves carrying superconducting thin film conductors and method of making same
US5187436A (en) * 1992-03-13 1993-02-16 General Electric Company Noise cancellation method in a biomagnetic measurement system using an extrapolated reference measurement
US5901453A (en) * 1994-12-21 1999-05-11 Forschungszentrum Julich Gmbh Gradiometer

Also Published As

Publication number Publication date
AU2002226874A1 (en) 2002-04-08
WO2002027332A2 (en) 2002-04-04

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