FR2145679A1 - - Google Patents

Info

Publication number
FR2145679A1
FR2145679A1 FR7225460A FR7225460A FR2145679A1 FR 2145679 A1 FR2145679 A1 FR 2145679A1 FR 7225460 A FR7225460 A FR 7225460A FR 7225460 A FR7225460 A FR 7225460A FR 2145679 A1 FR2145679 A1 FR 2145679A1
Authority
FR
France
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.)
Withdrawn
Application number
FR7225460A
Other languages
French (fr)
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.)
Unisys Group Services Ltd
Unisys Corp
Original Assignee
Sperry Rand Ltd
Sperry Rand Corp
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 US00162884A external-priority patent/US3763424A/en
Application filed by Sperry Rand Ltd, Sperry Rand Corp filed Critical Sperry Rand Ltd
Publication of FR2145679A1 publication Critical patent/FR2145679A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • G01V3/107—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 using compensating coil or loop arrangements
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
FR7225460A 1971-07-15 1972-07-13 Withdrawn FR2145679A1 (enrdf_load_stackoverflow)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US00162884A US3763424A (en) 1971-07-15 1971-07-15 Metal detector for identifying and discriminating between objects of different size, shape, orientation and ferrous content and including an auto nulling circuit
US24022272A 1972-03-31 1972-03-31

Publications (1)

Publication Number Publication Date
FR2145679A1 true FR2145679A1 (enrdf_load_stackoverflow) 1973-02-23

Family

ID=26859141

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7225460A Withdrawn FR2145679A1 (enrdf_load_stackoverflow) 1971-07-15 1972-07-13

Country Status (3)

Country Link
DE (1) DE2234701A1 (enrdf_load_stackoverflow)
FR (1) FR2145679A1 (enrdf_load_stackoverflow)
IT (1) IT961389B (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006015050A1 (de) * 2006-03-31 2007-10-11 Rolls-Royce Deutschland Ltd & Co Kg Metallpartikeldetektorensystem
DE102009021804A1 (de) * 2009-05-18 2010-11-25 Gerd Reime Metalldetektor
DE102012013554A1 (de) * 2012-07-06 2014-01-09 Mesutronic Gerätebau GmbH Einrichtung zum Abgleich von Metallsuchspulen

Also Published As

Publication number Publication date
DE2234701A1 (de) 1973-02-01
IT961389B (it) 1973-12-10

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Legal Events

Date Code Title Description
ST Notification of lapse