SE8803530D0 - PROCEDURE AND DEVICE FOR ALARM SYSTEM - Google Patents

PROCEDURE AND DEVICE FOR ALARM SYSTEM

Info

Publication number
SE8803530D0
SE8803530D0 SE8803530A SE8803530A SE8803530D0 SE 8803530 D0 SE8803530 D0 SE 8803530D0 SE 8803530 A SE8803530 A SE 8803530A SE 8803530 A SE8803530 A SE 8803530A SE 8803530 D0 SE8803530 D0 SE 8803530D0
Authority
SE
Sweden
Prior art keywords
field
coils
coverage
generated
result
Prior art date
Application number
SE8803530A
Other languages
Swedish (sv)
Other versions
SE462576B (en
SE8803530L (en
Inventor
L Lundberg
Original Assignee
Luxor Ab
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 Luxor Ab filed Critical Luxor Ab
Priority to SE8803530A priority Critical patent/SE462576B/en
Publication of SE8803530D0 publication Critical patent/SE8803530D0/en
Publication of SE8803530L publication Critical patent/SE8803530L/en
Publication of SE462576B publication Critical patent/SE462576B/en

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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

The invention relates to a method of controlling the coverage of the detection field in electromagnetic theft- prevention systems in, for example, shops. Said fields are arranged so as to be generated by interval-feeding two coils 1a, 1b, the coils being fed alternately in phase and in counterphase, as a result of which different directions of coverage of the magnetic fields 5 generated arise. The result of this is that a tuned resonant circuit, in the form of an alarm element, introduced into the field is always hit by one field irrespective of alignment. <IMAGE>
SE8803530A 1988-10-05 1988-10-05 Method and arrangement for an electromagnetic detection system SE462576B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE8803530A SE462576B (en) 1988-10-05 1988-10-05 Method and arrangement for an electromagnetic detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8803530A SE462576B (en) 1988-10-05 1988-10-05 Method and arrangement for an electromagnetic detection system

Publications (3)

Publication Number Publication Date
SE8803530D0 true SE8803530D0 (en) 1988-10-05
SE8803530L SE8803530L (en) 1990-04-06
SE462576B SE462576B (en) 1990-07-16

Family

ID=20373528

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8803530A SE462576B (en) 1988-10-05 1988-10-05 Method and arrangement for an electromagnetic detection system

Country Status (1)

Country Link
SE (1) SE462576B (en)

Also Published As

Publication number Publication date
SE462576B (en) 1990-07-16
SE8803530L (en) 1990-04-06

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