DE2031523C3 - Alarmanlage - Google Patents

Alarmanlage

Info

Publication number
DE2031523C3
DE2031523C3 DE19702031523 DE2031523A DE2031523C3 DE 2031523 C3 DE2031523 C3 DE 2031523C3 DE 19702031523 DE19702031523 DE 19702031523 DE 2031523 A DE2031523 A DE 2031523A DE 2031523 C3 DE2031523 C3 DE 2031523C3
Authority
DE
Germany
Prior art keywords
coils
logic circuit
alarm system
frequency
door
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
DE19702031523
Other languages
German (de)
English (en)
Other versions
DE2031523A1 (de
DE2031523B2 (enExample
Inventor
Yull Auburn New South Wales Brown (Australien)
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
Publication of DE2031523A1 publication Critical patent/DE2031523A1/de
Publication of DE2031523B2 publication Critical patent/DE2031523B2/de
Application granted granted Critical
Publication of DE2031523C3 publication Critical patent/DE2031523C3/de
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
    • 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

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)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)
DE19702031523 1969-06-26 1970-06-25 Alarmanlage Expired DE2031523C3 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
AU5707769 1969-06-26
AU5707869 1969-06-26
AU5780069 1969-07-11
AU5912369 1969-08-06
AU6556369 1969-12-22
AUPA005870 1970-01-12

Publications (3)

Publication Number Publication Date
DE2031523A1 DE2031523A1 (de) 1971-02-25
DE2031523B2 DE2031523B2 (enExample) 1975-04-30
DE2031523C3 true DE2031523C3 (de) 1976-01-08

Family

ID=27542766

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19702031523 Expired DE2031523C3 (de) 1969-06-26 1970-06-25 Alarmanlage

Country Status (5)

Country Link
DE (1) DE2031523C3 (enExample)
FR (1) FR2054591A1 (enExample)
GB (1) GB1320153A (enExample)
IL (1) IL34799A (enExample)
SE (1) SE361949B (enExample)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2314509A1 (fr) * 1975-06-11 1977-01-07 Dumesnil Gerard Procede et dispositif pour la detection de corps ferromagnetiques a fort champ coercitif notamment pour controler les acces aux lieux publics
SE450673B (sv) * 1980-01-15 1987-07-13 Matsushita Electric Works Ltd Varningsanleggning, for indikering av en persons nervaro inom ett givet omrade
FR2510764A1 (fr) * 1981-07-30 1983-02-04 Franquet Leon Dispositif de detection d'objets metalliques, tels que des armes a feu, et sas d'acces de locaux equipes de tels dispositifs
GB2220444A (en) * 1988-07-06 1990-01-10 Paul Francis Creer Revolving security door
CA2393519C (en) * 2000-10-04 2010-09-14 Adt Security Services, Inc. Ingress/egress control system for airport concourses and other access controlled areas

Also Published As

Publication number Publication date
IL34799A (en) 1973-01-30
DE2031523A1 (de) 1971-02-25
GB1320153A (en) 1973-06-13
DE2031523B2 (enExample) 1975-04-30
SE361949B (enExample) 1973-11-19
FR2054591A1 (enExample) 1971-04-23

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Legal Events

Date Code Title Description
C3 Grant after two publication steps (3rd publication)
E77 Valid patent as to the heymanns-index 1977
EHJ Ceased/non-payment of the annual fee