GB2337128A - Magnetic gradiometer - Google Patents

Magnetic gradiometer

Info

Publication number
GB2337128A
GB2337128A GB9917682A GB9917682A GB2337128A GB 2337128 A GB2337128 A GB 2337128A GB 9917682 A GB9917682 A GB 9917682A GB 9917682 A GB9917682 A GB 9917682A GB 2337128 A GB2337128 A GB 2337128A
Authority
GB
United Kingdom
Prior art keywords
magnetic field
gradiometer
magnetometers
field gradient
gradient components
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB9917682A
Other versions
GB9917682D0 (en
GB2337128B (en
Inventor
Mark Nicholas Keene
Julian Simon Satchell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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
Priority claimed from GBGB9704911.8A external-priority patent/GB9704911D0/en
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB9917682A priority Critical patent/GB2337128B/en
Publication of GB9917682D0 publication Critical patent/GB9917682D0/en
Publication of GB2337128A publication Critical patent/GB2337128A/en
Application granted granted Critical
Publication of GB2337128B publication Critical patent/GB2337128B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G01R33/0206—Three-component magnetometers
    • 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
    • G01R33/022—Measuring gradient

Abstract

A gradiometer for measuring properties of a magnetic field and, in particular, for measuring magnetic field gradient components, comprising at least two magnetic sensors wherein at least two of the magnetic sensors are arranged to sense the magnetic field component in substantially the same direction. The magnetic sensors may be superconducting quantum interference device (SQUID) magnetometers. Hall probes, flux gates, or magnet-resistive magnetometers. The gradiometer also includes a computer processor, loaded with an adaptive signal processing algorithm, for performing adaptive signal balancing of the magnetometer outputs. In a preferred embodiment the gradiometer may comprise at least eight magnetometers in a three-dimensional arrangement, and a set of three orthogonal global feedback coils, one for each direction x, y, z, such that the five independent magnetic field gradient components may be measured. The gradiometer may also be used to measure second or higher order magnetic field gradient components.
GB9917682A 1997-03-10 1998-03-06 Magnetic gradiometer Expired - Fee Related GB2337128B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9917682A GB2337128B (en) 1997-03-10 1998-03-06 Magnetic gradiometer

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9704911.8A GB9704911D0 (en) 1997-03-10 1997-03-10 A magnetic gradiometer
PCT/GB1998/000685 WO1998040757A1 (en) 1997-03-10 1998-03-06 Magnetic gradiometer
GB9917682A GB2337128B (en) 1997-03-10 1998-03-06 Magnetic gradiometer

Publications (3)

Publication Number Publication Date
GB9917682D0 GB9917682D0 (en) 1999-09-29
GB2337128A true GB2337128A (en) 1999-11-10
GB2337128B GB2337128B (en) 2001-12-05

Family

ID=26311149

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9917682A Expired - Fee Related GB2337128B (en) 1997-03-10 1998-03-06 Magnetic gradiometer

Country Status (1)

Country Link
GB (1) GB2337128B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108732517B (en) * 2018-04-22 2020-07-14 成都理工大学 Flux gate gradient measuring probe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5020538A (en) * 1988-08-12 1991-06-04 Sam Technology, Inc. Low noise magnetoencephalogram system and method
US5122744A (en) * 1990-10-09 1992-06-16 Ibm Corporation Gradiometer having a magnetometer which cancels background magnetic field from other magnetometers
US5488295A (en) * 1990-05-15 1996-01-30 Valtion Teknillinen Tutkimuskeskus Method and apparatus for cancelling noise of a low-noise sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5020538A (en) * 1988-08-12 1991-06-04 Sam Technology, Inc. Low noise magnetoencephalogram system and method
US5488295A (en) * 1990-05-15 1996-01-30 Valtion Teknillinen Tutkimuskeskus Method and apparatus for cancelling noise of a low-noise sensor
US5122744A (en) * 1990-10-09 1992-06-16 Ibm Corporation Gradiometer having a magnetometer which cancels background magnetic field from other magnetometers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Review of Scientific Instruments, Vol 67, No. 1, Jan 1996, pages 230 - 235. *

Also Published As

Publication number Publication date
GB9917682D0 (en) 1999-09-29
GB2337128B (en) 2001-12-05

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20030306