WO2001084188A3 - Steerable three-dimensional magnetic field sensor system for detection and classification of metal targets - Google Patents

Steerable three-dimensional magnetic field sensor system for detection and classification of metal targets Download PDF

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Publication number
WO2001084188A3
WO2001084188A3 PCT/US2001/013933 US0113933W WO0184188A3 WO 2001084188 A3 WO2001084188 A3 WO 2001084188A3 US 0113933 W US0113933 W US 0113933W WO 0184188 A3 WO0184188 A3 WO 0184188A3
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic field
antenna
steerable
sensor system
hmf
Prior art date
Application number
PCT/US2001/013933
Other languages
French (fr)
Other versions
WO2001084188A2 (en
Inventor
Carl V Nelson
Original Assignee
Univ Johns Hopkins
Carl V Nelson
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 Univ Johns Hopkins, Carl V Nelson filed Critical Univ Johns Hopkins
Priority to EP01948209A priority Critical patent/EP1285285A2/en
Priority to US10/182,519 priority patent/US7030759B2/en
Priority to AU69684/01A priority patent/AU773887B2/en
Publication of WO2001084188A2 publication Critical patent/WO2001084188A2/en
Publication of WO2001084188A3 publication Critical patent/WO2001084188A3/en

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
    • G01V3/10—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 using induction coils
    • G01V3/104—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 using induction coils using several coupled or uncoupled coils
    • G01V3/105—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 using induction coils using several coupled or uncoupled coils forming directly coupled primary and secondary coils or loops
    • 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
    • G01V3/15—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for use during transport, e.g. by a person, vehicle or boat

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Electromagnetism (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

A steerable electromagnetic induction (EMI) sensor system for measuring the magnetic polarizability tensor of a metal target. Instead of creating a vertical magnetic field from a horizontal loop transmitter configuration used by most prior art EMI metal detectors, the transmitter geometry of the sensor system's antenna is designed especially for creating multiple horizontal and vertical magnetic fields and for steering the same in all directions. The horizontal magnetic field (HMF) antenna has the potential advantage of a relatively uniform magnetic field over a large volume. A second potential advantage of the HMF antenna is that compared to a conventional loop antenna, the magnetic field intensity falls off slowly with distance from the plane of the antenna. Combining two HMF sensor systems creates a sterrable two-dimensional magnetic field sensor. Combining the steerable HMF sensor with a vertical magnetic field antenna forms a three-dimensional steerable magnetic field sensor system.
PCT/US2001/013933 2000-05-02 2001-04-30 Steerable three-dimensional magnetic field sensor system for detection and classification of metal targets WO2001084188A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP01948209A EP1285285A2 (en) 2000-05-02 2001-04-30 Steerable three-dimensional magnetic field sensor system for detection and classification of metal targets
US10/182,519 US7030759B2 (en) 2000-05-02 2001-04-30 Steerable three-dimensional magnetic field sensor system for detection and classification of metal targets
AU69684/01A AU773887B2 (en) 2000-05-02 2001-04-30 Steerable three-dimensional magnetic field sensor system for detection and classification of metal targets

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US20102000P 2000-05-02 2000-05-02
US60/201,020 2000-05-02

Publications (2)

Publication Number Publication Date
WO2001084188A2 WO2001084188A2 (en) 2001-11-08
WO2001084188A3 true WO2001084188A3 (en) 2002-05-23

Family

ID=22744149

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/013933 WO2001084188A2 (en) 2000-05-02 2001-04-30 Steerable three-dimensional magnetic field sensor system for detection and classification of metal targets

Country Status (4)

Country Link
US (1) US7030759B2 (en)
EP (1) EP1285285A2 (en)
AU (1) AU773887B2 (en)
WO (1) WO2001084188A2 (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002365033A1 (en) * 2001-10-25 2003-06-17 The Johns Hopkins University Wide area metal detection (wamd) system and method for security screening crowds
US7106194B2 (en) 2001-11-16 2006-09-12 The Johns Hopkins University Method for metal object identification using a three-dimensional steerable magnetic field antenna
US6870370B2 (en) * 2002-07-10 2005-03-22 Agri Dynamics, Inc. Electromagnetic induction detection system
DK1597610T3 (en) * 2003-02-13 2015-06-15 Bubioil Aps Measuring equipment and method for mapping the geology of an underground formation
US7176691B2 (en) * 2003-09-16 2007-02-13 Johns Hopkins University Switched coil receiver antenna for metal detector
US20060038558A1 (en) * 2004-08-20 2006-02-23 The Boeing Company Eddy current inspection device
US7304474B2 (en) * 2005-11-29 2007-12-04 The Boeing Company Eddy current inspection device with arrays of magnetoresistive sensors
US7388501B2 (en) * 2006-05-19 2008-06-17 Mark Iv Industries Corp Method of enabling two-state operation of electronic toll collection system
US7397239B2 (en) * 2006-07-11 2008-07-08 Ge Security, Inc. Passenger screening system and method
GB2441346B (en) 2006-09-01 2011-04-13 Qinetiq Ltd Metal object detecting apparatus
US7759941B2 (en) * 2008-02-07 2010-07-20 Geonics Limited Ground conductivity meter with automatic calibration
US9465129B1 (en) * 2009-03-06 2016-10-11 See Scan, Inc. Image-based mapping locating system
EP2753956B1 (en) 2011-09-06 2019-07-31 SeeScan, Inc. Method and apparatus for locating buried objects using infinite sheet current flow model
RU2494419C1 (en) * 2012-03-11 2013-09-27 Открытое акционерное общество Научно-производственное предприятие "Научно-исследовательский и проектно-конструкторский институт геофизических исследований геологоразведочных скважин" (ОАО НПП "ВНИИГИС") Geoelectric survey method
US9651341B2 (en) * 2013-03-14 2017-05-16 The United States Of America, As Represented By The Secretary Of The Navy System for the detection and classification of buried unexploded ordnance
JP6234690B2 (en) * 2013-03-29 2017-11-22 大阪瓦斯株式会社 Transmitter of buried pipe detection device and induction coil for transmitter
CN104597508B (en) * 2014-12-09 2017-02-01 北京科技大学 Three-axis magnetic sensor based three-dimensional magnetic field positioning method and system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112349A (en) * 1977-05-09 1978-09-05 Harold James Weber Apparatus including bivolumetric tone subaudition means for positionally spotting and tracing subjacently concealed conductive structures
US5726628A (en) * 1996-05-06 1998-03-10 Gd Electronics, Inc. Metal detector system
WO1998030921A2 (en) * 1997-01-06 1998-07-16 Jentek Sensors, Inc. Magnetometer and dielectrometer detection of subsurface objects

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4872018A (en) * 1987-08-31 1989-10-03 Monarch Marking Systems, Inc. Multiple loop antenna
US5307072A (en) * 1992-07-09 1994-04-26 Polhemus Incorporated Non-concentricity compensation in position and orientation measurement systems
GB9813889D0 (en) * 1998-06-27 1998-08-26 Secr Defence Apparatus for detecting metals
US6195009B1 (en) * 1999-11-15 2001-02-27 Hector Irizarry Child monitoring device adapted for use with an electronic surveillance system
US6392547B1 (en) * 1999-11-26 2002-05-21 Microgistics, Inc. Proximity monitoring system and associated methods
US6538617B2 (en) * 2000-02-08 2003-03-25 Concorde Microsystems, Inc. Two-axis, single output magnetic field sensing antenna

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112349A (en) * 1977-05-09 1978-09-05 Harold James Weber Apparatus including bivolumetric tone subaudition means for positionally spotting and tracing subjacently concealed conductive structures
US5726628A (en) * 1996-05-06 1998-03-10 Gd Electronics, Inc. Metal detector system
WO1998030921A2 (en) * 1997-01-06 1998-07-16 Jentek Sensors, Inc. Magnetometer and dielectrometer detection of subsurface objects

Also Published As

Publication number Publication date
US20030016131A1 (en) 2003-01-23
EP1285285A2 (en) 2003-02-26
WO2001084188A2 (en) 2001-11-08
AU773887B2 (en) 2004-06-10
US7030759B2 (en) 2006-04-18
AU6968401A (en) 2001-11-12

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