FR2319138A1 - Dispositif de detection d'objets en mouvement par utilisation des perturbations du champ magnetique terrestre - Google Patents

Dispositif de detection d'objets en mouvement par utilisation des perturbations du champ magnetique terrestre

Info

Publication number
FR2319138A1
FR2319138A1 FR7523858A FR7523858A FR2319138A1 FR 2319138 A1 FR2319138 A1 FR 2319138A1 FR 7523858 A FR7523858 A FR 7523858A FR 7523858 A FR7523858 A FR 7523858A FR 2319138 A1 FR2319138 A1 FR 2319138A1
Authority
FR
France
Prior art keywords
pointer
unmasks
magnetic field
alarm circuit
utilises
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
FR7523858A
Other languages
English (en)
French (fr)
Other versions
FR2319138B1 (cg-RX-API-DMAC10.html
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.)
COMPAIN BATISSOU JEAN
Original Assignee
COMPAIN BATISSOU JEAN
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 COMPAIN BATISSOU JEAN filed Critical COMPAIN BATISSOU JEAN
Priority to FR7523858A priority Critical patent/FR2319138A1/fr
Publication of FR2319138A1 publication Critical patent/FR2319138A1/fr
Application granted granted Critical
Publication of FR2319138B1 publication Critical patent/FR2319138B1/fr
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
    • G01V3/087—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 the earth magnetic field being modified by the objects or geological structures
    • 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
    • G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Electric Clocks (AREA)
FR7523858A 1975-07-23 1975-07-23 Dispositif de detection d'objets en mouvement par utilisation des perturbations du champ magnetique terrestre Granted FR2319138A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7523858A FR2319138A1 (fr) 1975-07-23 1975-07-23 Dispositif de detection d'objets en mouvement par utilisation des perturbations du champ magnetique terrestre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7523858A FR2319138A1 (fr) 1975-07-23 1975-07-23 Dispositif de detection d'objets en mouvement par utilisation des perturbations du champ magnetique terrestre

Publications (2)

Publication Number Publication Date
FR2319138A1 true FR2319138A1 (fr) 1977-02-18
FR2319138B1 FR2319138B1 (cg-RX-API-DMAC10.html) 1979-06-15

Family

ID=9158551

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7523858A Granted FR2319138A1 (fr) 1975-07-23 1975-07-23 Dispositif de detection d'objets en mouvement par utilisation des perturbations du champ magnetique terrestre

Country Status (1)

Country Link
FR (1) FR2319138A1 (cg-RX-API-DMAC10.html)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1016980A (en) * 1963-09-25 1966-01-12 Honeywell Inc Improved apparatus for detecting ferrous metal objects

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1016980A (en) * 1963-09-25 1966-01-12 Honeywell Inc Improved apparatus for detecting ferrous metal objects

Also Published As

Publication number Publication date
FR2319138B1 (cg-RX-API-DMAC10.html) 1979-06-15

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Legal Events

Date Code Title Description
ST Notification of lapse