DE3707210C2 - - Google Patents

Info

Publication number
DE3707210C2
DE3707210C2 DE3707210A DE3707210A DE3707210C2 DE 3707210 C2 DE3707210 C2 DE 3707210C2 DE 3707210 A DE3707210 A DE 3707210A DE 3707210 A DE3707210 A DE 3707210A DE 3707210 C2 DE3707210 C2 DE 3707210C2
Authority
DE
Germany
Prior art keywords
phase
signal
control
metal detector
output
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.)
Expired
Application number
DE3707210A
Other languages
German (de)
English (en)
Other versions
DE3707210A1 (de
Inventor
Klaus Dipl.-Ing. Auslaender (Fh), 7410 Reutlingen, De
Hans Juergen Dipl.-Ing. Fabris (Fh), 7417 Pfullingen, De
Wolfgang Dipl.-Phys. 7410 Reutlingen De Patzwald
Helmut Dipl.-Phys. Dr. 7417 Pfullingen De Seichter
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.)
Institut Dr Friedrich Foerster Pruefgeraetebau GmbH and Co KG
Original Assignee
Institut Dr Friedrich Foerster Pruefgeraetebau GmbH and Co KG
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 Institut Dr Friedrich Foerster Pruefgeraetebau GmbH and Co KG filed Critical Institut Dr Friedrich Foerster Pruefgeraetebau GmbH and Co KG
Priority to DE19873707210 priority Critical patent/DE3707210A1/de
Priority to US07/074,232 priority patent/US4881036A/en
Priority to EP88102790A priority patent/EP0281014B1/de
Priority to DE8888102790T priority patent/DE3865042D1/de
Publication of DE3707210A1 publication Critical patent/DE3707210A1/de
Application granted granted Critical
Publication of DE3707210C2 publication Critical patent/DE3707210C2/de
Granted 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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Geophysics And Detection Of Objects (AREA)
DE19873707210 1987-03-06 1987-03-06 Induktives metallsuchgeraet Granted DE3707210A1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19873707210 DE3707210A1 (de) 1987-03-06 1987-03-06 Induktives metallsuchgeraet
US07/074,232 US4881036A (en) 1987-03-06 1987-07-16 Phase shift compensation for metal detection apparatus
EP88102790A EP0281014B1 (de) 1987-03-06 1988-02-25 Induktives Metallsuchgerät
DE8888102790T DE3865042D1 (de) 1987-03-06 1988-02-25 Induktives metallsuchgeraet.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873707210 DE3707210A1 (de) 1987-03-06 1987-03-06 Induktives metallsuchgeraet

Publications (2)

Publication Number Publication Date
DE3707210A1 DE3707210A1 (de) 1988-09-15
DE3707210C2 true DE3707210C2 (enExample) 1989-10-26

Family

ID=6322415

Family Applications (2)

Application Number Title Priority Date Filing Date
DE19873707210 Granted DE3707210A1 (de) 1987-03-06 1987-03-06 Induktives metallsuchgeraet
DE8888102790T Expired - Lifetime DE3865042D1 (de) 1987-03-06 1988-02-25 Induktives metallsuchgeraet.

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE8888102790T Expired - Lifetime DE3865042D1 (de) 1987-03-06 1988-02-25 Induktives metallsuchgeraet.

Country Status (3)

Country Link
US (1) US4881036A (enExample)
EP (1) EP0281014B1 (enExample)
DE (2) DE3707210A1 (enExample)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3839386A1 (de) * 1988-11-22 1990-05-23 Schaller Automation Induktiver naeherungssensor
US5414411A (en) * 1993-06-21 1995-05-09 White's Electronics, Inc. Pulse induction metal detector
EP2439560B1 (en) 2010-10-07 2013-05-29 Mettler-Toledo Safeline Limited Method for monitoring the operation of a metal detection system and metal detection system
EP2439559B1 (en) 2010-10-07 2013-05-29 Mettler-Toledo Safeline Limited Method for operating of a metal detection system and metal detection system
CN103180760B (zh) 2010-10-07 2016-10-26 梅特勒-托利多安全线有限公司 用于操作金属探测系统的方法以及金属探测系统
US9018935B2 (en) 2011-09-19 2015-04-28 Mettler-Toledo Safeline Limited Method for operating a metal detection apparatus and apparatus

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2438197A (en) * 1942-12-31 1948-03-23 Hazeltine Research Inc Phase-selective variable-frequency oscillatory system
NL294973A (enExample) * 1946-06-11
FR1397251A (fr) * 1964-02-06 1965-04-30 Schlumberger Prospection Perfectionnements aux appareils de mesure de conductivité électrique
US3471772A (en) * 1967-05-02 1969-10-07 Singer Inc H R B Instrument for measuring the range and approximate size of buried or hidden metal objects
DE2058754B2 (de) * 1970-11-30 1973-09-06 Dr. Hans Boekels & Co, 5100 Aachen Schaltungsanordnung fuer ein an bewegtem foerdergut eingesetztes metallsuchgeraet
US3835371A (en) * 1972-07-27 1974-09-10 M Mirdadian Apparatus for detecting the presence of electrically conductive material within a given sensing area
US4084135A (en) * 1975-08-25 1978-04-11 The Goodyear Tire & Rubber Company System and method for checking the sensitivity and performance of an electromagnetic field variation detector
US4249128A (en) * 1978-02-06 1981-02-03 White's Electronics, Inc. Wide pulse gated metal detector with improved noise rejection
US4486713A (en) * 1981-09-28 1984-12-04 Gifford Jack D Metal detector apparatus utilizing controlled phase response to reject ground effects and to discriminate between different types of metals
US4628265A (en) * 1983-04-22 1986-12-09 Frl, Inc. Metal detector and classifier with automatic compensation for soil magnetic minerals and sensor misalignment
US4700139A (en) * 1984-10-29 1987-10-13 Garrett Electronics, Inc. Metal detector circuit having selectable exclusion range for unwanted objects
GB8517257D0 (en) * 1985-07-08 1985-08-14 Goring Kerr Plc Metal detector

Also Published As

Publication number Publication date
EP0281014B1 (de) 1991-09-25
DE3865042D1 (de) 1991-10-31
EP0281014A2 (de) 1988-09-07
EP0281014A3 (en) 1989-09-06
US4881036A (en) 1989-11-14
DE3707210A1 (de) 1988-09-15

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Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee
8339 Ceased/non-payment of the annual fee