FR2314509A1 - Procede et dispositif pour la detection de corps ferromagnetiques a fort champ coercitif notamment pour controler les acces aux lieux publics - Google Patents

Procede et dispositif pour la detection de corps ferromagnetiques a fort champ coercitif notamment pour controler les acces aux lieux publics

Info

Publication number
FR2314509A1
FR2314509A1 FR7518189A FR7518189A FR2314509A1 FR 2314509 A1 FR2314509 A1 FR 2314509A1 FR 7518189 A FR7518189 A FR 7518189A FR 7518189 A FR7518189 A FR 7518189A FR 2314509 A1 FR2314509 A1 FR 2314509A1
Authority
FR
France
Prior art keywords
capacitor
coil
ferromagnetic object
nonmagnetic material
remanent magnetism
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
FR7518189A
Other languages
English (en)
French (fr)
Other versions
FR2314509B1 (enExample
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7518189A priority Critical patent/FR2314509A1/fr
Publication of FR2314509A1 publication Critical patent/FR2314509A1/fr
Application granted granted Critical
Publication of FR2314509B1 publication Critical patent/FR2314509B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
FR7518189A 1975-06-11 1975-06-11 Procede et dispositif pour la detection de corps ferromagnetiques a fort champ coercitif notamment pour controler les acces aux lieux publics Granted FR2314509A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7518189A FR2314509A1 (fr) 1975-06-11 1975-06-11 Procede et dispositif pour la detection de corps ferromagnetiques a fort champ coercitif notamment pour controler les acces aux lieux publics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7518189A FR2314509A1 (fr) 1975-06-11 1975-06-11 Procede et dispositif pour la detection de corps ferromagnetiques a fort champ coercitif notamment pour controler les acces aux lieux publics

Publications (2)

Publication Number Publication Date
FR2314509A1 true FR2314509A1 (fr) 1977-01-07
FR2314509B1 FR2314509B1 (enExample) 1977-12-09

Family

ID=9156337

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7518189A Granted FR2314509A1 (fr) 1975-06-11 1975-06-11 Procede et dispositif pour la detection de corps ferromagnetiques a fort champ coercitif notamment pour controler les acces aux lieux publics

Country Status (1)

Country Link
FR (1) FR2314509A1 (enExample)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2054591A1 (enExample) * 1969-06-26 1971-04-23 Brown Yull

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2054591A1 (enExample) * 1969-06-26 1971-04-23 Brown Yull

Also Published As

Publication number Publication date
FR2314509B1 (enExample) 1977-12-09

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Legal Events

Date Code Title Description
ST Notification of lapse