GB2357853A - Apparatus for detecting metals - Google Patents

Apparatus for detecting metals

Info

Publication number
GB2357853A
GB2357853A GB0029648A GB0029648A GB2357853A GB 2357853 A GB2357853 A GB 2357853A GB 0029648 A GB0029648 A GB 0029648A GB 0029648 A GB0029648 A GB 0029648A GB 2357853 A GB2357853 A GB 2357853A
Authority
GB
United Kingdom
Prior art keywords
magnetic field
metal object
detecting
measured
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
GB0029648A
Other versions
GB2357853B (en
GB0029648D0 (en
Inventor
Mark Nicholas Keene
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
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Publication of GB0029648D0 publication Critical patent/GB0029648D0/en
Publication of GB2357853A publication Critical patent/GB2357853A/en
Application granted granted Critical
Publication of GB2357853B publication Critical patent/GB2357853B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices

Abstract

Apparatus for detecting a metal object comprises transmitter means for generating a pulsed or an alternating magnetic field in the vicinity of the metal object to be detected and detection means for detecting the secondary magnetic field induced in the metal object by the transmitted magnetic field. The detection means comprise means for measuring at least three magnetic field gradient components of at least first order of the secondary magnetic field. The apparatus also comprises processing means for determining at least one of the positions or the electro-magnetic cross section or an estimate of the shape of the metal object from the measured magnetic field spatial gradient components. The processing means comprises of fitting the measured components to dipole, multiple dipole, multipole, or extended source models.
GB0029648A 1998-06-27 1999-06-10 Apparatus for detecting metals Expired - Fee Related GB2357853B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9813889.4A GB9813889D0 (en) 1998-06-27 1998-06-27 Apparatus for detecting metals
PCT/GB1999/001847 WO2000000848A1 (en) 1998-06-27 1999-06-10 Apparatus for detecting metals

Publications (3)

Publication Number Publication Date
GB0029648D0 GB0029648D0 (en) 2001-01-17
GB2357853A true GB2357853A (en) 2001-07-04
GB2357853B GB2357853B (en) 2003-01-22

Family

ID=10834492

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9813889.4A Ceased GB9813889D0 (en) 1998-06-27 1998-06-27 Apparatus for detecting metals
GB0029648A Expired - Fee Related GB2357853B (en) 1998-06-27 1999-06-10 Apparatus for detecting metals

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9813889.4A Ceased GB9813889D0 (en) 1998-06-27 1998-06-27 Apparatus for detecting metals

Country Status (11)

Country Link
US (1) US6541966B1 (en)
EP (1) EP1092163B1 (en)
JP (1) JP4173638B2 (en)
AT (1) ATE266212T1 (en)
AU (1) AU4281899A (en)
CA (1) CA2335499C (en)
DE (1) DE69917030T2 (en)
GB (2) GB9813889D0 (en)
NO (1) NO327748B1 (en)
WO (1) WO2000000848A1 (en)
ZA (1) ZA200007370B (en)

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GB2441346A (en) * 2006-09-01 2008-03-05 Qinetiq Ltd Metal object detecting apparatus and method
US7414404B2 (en) 2001-10-17 2008-08-19 Qinetiq Limited Metal detection apparatus

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7414404B2 (en) 2001-10-17 2008-08-19 Qinetiq Limited Metal detection apparatus
GB2441346A (en) * 2006-09-01 2008-03-05 Qinetiq Ltd Metal object detecting apparatus and method
US7545140B2 (en) 2006-09-01 2009-06-09 Qinetiq Limited Metal object detecting apparatus
GB2441346B (en) * 2006-09-01 2011-04-13 Qinetiq Ltd Metal object detecting apparatus

Also Published As

Publication number Publication date
NO20006647L (en) 2001-02-27
ATE266212T1 (en) 2004-05-15
AU4281899A (en) 2000-01-17
WO2000000848A1 (en) 2000-01-06
GB2357853B (en) 2003-01-22
ZA200007370B (en) 2002-03-11
NO20006647D0 (en) 2000-12-22
US6541966B1 (en) 2003-04-01
NO327748B1 (en) 2009-09-14
CA2335499C (en) 2005-03-29
EP1092163A1 (en) 2001-04-18
JP2003517572A (en) 2003-05-27
CA2335499A1 (en) 2000-01-06
EP1092163B1 (en) 2004-05-06
GB9813889D0 (en) 1998-08-26
GB0029648D0 (en) 2001-01-17
DE69917030T2 (en) 2005-04-28
DE69917030D1 (en) 2004-06-09
JP4173638B2 (en) 2008-10-29

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Legal Events

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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: 20050610