SE8007903L - INTRANGSDETEKTORANLEGGNING - Google Patents

INTRANGSDETEKTORANLEGGNING

Info

Publication number
SE8007903L
SE8007903L SE8007903A SE8007903A SE8007903L SE 8007903 L SE8007903 L SE 8007903L SE 8007903 A SE8007903 A SE 8007903A SE 8007903 A SE8007903 A SE 8007903A SE 8007903 L SE8007903 L SE 8007903L
Authority
SE
Sweden
Prior art keywords
wires
tube
electrically conductive
length
electret
Prior art date
Application number
SE8007903A
Other languages
Unknown language ( )
Swedish (sv)
Inventor
L R Wold
Original Assignee
Honeywell Inc
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 Honeywell Inc filed Critical Honeywell Inc
Publication of SE8007903L publication Critical patent/SE8007903L/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/01—Electrostatic transducers characterised by the use of electrets
    • H04R19/016—Electrostatic transducers characterised by the use of electrets for microphones
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
    • G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
    • G08B13/169—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using cable transducer means
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

A sensor for use with intrusion detection circuitry includes a hollow electrically conductive tube 10 having a substantial length and at least two electrically conductive wires 12, 14 extending loosely inside the tube along the length thereof, each of the wires having alternating areas of electret sensitivity 16, 18 and insensitivity. The electric signals generated by vibration of the wires in the tube are subtracted by a processor and the resultant electric signal fed to an alarm. <IMAGE>
SE8007903A 1979-11-13 1980-11-11 INTRANGSDETEKTORANLEGGNING SE8007903L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9365379A 1979-11-13 1979-11-13

Publications (1)

Publication Number Publication Date
SE8007903L true SE8007903L (en) 1981-05-14

Family

ID=22240062

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8007903A SE8007903L (en) 1979-11-13 1980-11-11 INTRANGSDETEKTORANLEGGNING

Country Status (5)

Country Link
BE (1) BE886110A (en)
DE (1) DE3042358A1 (en)
FR (1) FR2469721A1 (en)
GB (1) GB2063537A (en)
SE (1) SE8007903L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206458B1 (en) * 1985-04-17 1992-07-01 Geoquip Security Systems Limited Vibration-sensitive transducer
GB2182182B (en) * 1985-04-24 1989-06-28 Sound Special Services Limited Intrusion detecting device

Also Published As

Publication number Publication date
FR2469721A1 (en) 1981-05-22
DE3042358A1 (en) 1981-05-14
GB2063537A (en) 1981-06-03
BE886110A (en) 1981-03-02

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