FR2371128A7 - Systeme de detection a circuit resonnant non lineaire - Google Patents

Systeme de detection a circuit resonnant non lineaire

Info

Publication number
FR2371128A7
FR2371128A7 FR7734339A FR7734339A FR2371128A7 FR 2371128 A7 FR2371128 A7 FR 2371128A7 FR 7734339 A FR7734339 A FR 7734339A FR 7734339 A FR7734339 A FR 7734339A FR 2371128 A7 FR2371128 A7 FR 2371128A7
Authority
FR
France
Prior art keywords
circuit
detection system
resonant circuit
resonant
circuit detection
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
FR7734339A
Other languages
English (en)
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.)
Nederlandsche Apparatenfabriek NEDAP NV
Original Assignee
Nederlandsche Apparatenfabriek NEDAP NV
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 Nederlandsche Apparatenfabriek NEDAP NV filed Critical Nederlandsche Apparatenfabriek NEDAP NV
Application granted granted Critical
Publication of FR2371128A7 publication Critical patent/FR2371128A7/fr
Expired 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
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2422—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using acoustic or microwave tags
    • 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
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428—Tag details
    • G08B13/2431—Tag circuit details

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)
FR7734339A 1976-11-15 1977-11-15 Systeme de detection a circuit resonnant non lineaire Expired FR2371128A7 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4751376A GB1586069A (en) 1976-11-15 1976-11-15 Detection systems

Publications (1)

Publication Number Publication Date
FR2371128A7 true FR2371128A7 (fr) 1978-06-09

Family

ID=10445252

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7734339A Expired FR2371128A7 (fr) 1976-11-15 1977-11-15 Systeme de detection a circuit resonnant non lineaire

Country Status (5)

Country Link
BE (1) BE860830A (enrdf_load_stackoverflow)
DE (1) DE2750863A1 (enrdf_load_stackoverflow)
FR (1) FR2371128A7 (enrdf_load_stackoverflow)
GB (1) GB1586069A (enrdf_load_stackoverflow)
NL (1) NL7712500A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062056A4 (en) * 1980-10-09 1985-06-06 Deterrent Tech Corp DUAL FREQUENCY ANTI-THEFT SYSTEM.
EP0628937A1 (en) * 1993-06-09 1994-12-14 N.V. Nederlandsche Apparatenfabriek NEDAP Theft detection system
FR2741021A1 (fr) * 1995-11-09 1997-05-16 Siemens Ag Systeme antivol pour vehicule automobile

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3234601A1 (de) * 1982-09-17 1984-03-22 Siemens AG, 1000 Berlin und 8000 München Anordnung zur markierung von personen und objekten
NL8204802A (nl) * 1982-12-10 1984-07-02 Nedap Nv Detectieplaatje met niet-lineair circuit voor een detectiestelsel.
DE3324957A1 (de) * 1983-07-11 1985-01-31 Sennheiser Electronic Kg, 3002 Wedemark Verfahren zur stromversorgung einer tragbaren nebenstation eines datenuebermittlungssystems
DE3840347A1 (de) * 1988-11-30 1990-05-31 Landstorfer Friedrich Verfahren zur messung der summenentfernung zwischen einem sende-, einem bezugs- und einem empfangsort

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3631442A (en) * 1968-03-22 1971-12-28 Robert E Fearon Anti-shoplifting system
DE2352807C3 (de) * 1973-10-20 1979-10-25 Philips Patentverwaltung Gmbh, 2000 Hamburg Die Summenfrequenz erzeugender Antwortgeber für ein Sende- und Empfangssystem zur Erkennung bewegbarer Körper

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062056A4 (en) * 1980-10-09 1985-06-06 Deterrent Tech Corp DUAL FREQUENCY ANTI-THEFT SYSTEM.
EP0628937A1 (en) * 1993-06-09 1994-12-14 N.V. Nederlandsche Apparatenfabriek NEDAP Theft detection system
NL9300991A (nl) * 1993-06-09 1995-01-02 Nedap Nv Diefstaldetectiesysteem.
FR2741021A1 (fr) * 1995-11-09 1997-05-16 Siemens Ag Systeme antivol pour vehicule automobile

Also Published As

Publication number Publication date
DE2750863C2 (enrdf_load_stackoverflow) 1988-10-20
NL7712500A (nl) 1978-05-17
DE2750863A1 (de) 1978-05-18
BE860830A (nl) 1978-05-16
GB1586069A (en) 1981-03-18

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