EP0289641A1 - Clôture de sécurité avec fils de sécurité fixés à des poteaux à travers de détecteurs - Google Patents

Clôture de sécurité avec fils de sécurité fixés à des poteaux à travers de détecteurs Download PDF

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Publication number
EP0289641A1
EP0289641A1 EP87106681A EP87106681A EP0289641A1 EP 0289641 A1 EP0289641 A1 EP 0289641A1 EP 87106681 A EP87106681 A EP 87106681A EP 87106681 A EP87106681 A EP 87106681A EP 0289641 A1 EP0289641 A1 EP 0289641A1
Authority
EP
European Patent Office
Prior art keywords
signal
sensor
circuit
security
alarm
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
EP87106681A
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German (de)
English (en)
Other versions
EP0289641B1 (fr
Inventor
Harald Dipl.-Ing. Seifert
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.)
Shorrock Ltd
Original Assignee
KTV SICHERHEITSTECHNIK GmbH
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 KTV SICHERHEITSTECHNIK GmbH filed Critical KTV SICHERHEITSTECHNIK GmbH
Priority to DE8787106681T priority Critical patent/DE3776899D1/de
Priority to AT87106681T priority patent/ATE72906T1/de
Priority to EP87106681A priority patent/EP0289641B1/fr
Priority to IL82831A priority patent/IL82831A0/xx
Priority to US07/071,808 priority patent/US4803468A/en
Priority to CA000542193A priority patent/CA1276256C/fr
Publication of EP0289641A1 publication Critical patent/EP0289641A1/fr
Application granted granted Critical
Publication of EP0289641B1 publication Critical patent/EP0289641B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
    • G08B13/122—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a perimeter fence

Definitions

  • the invention relates to a security fence with security wires attached to posts by sensors according to the preamble of claim 1.
  • the evaluation circuit explained there comprises a switch arrangement which connects the individual sensors in succession to a measuring circuit.
  • the measuring circuit successively measures the signal amplitudes of the sensors and forms an average value therefrom.
  • a comparator compares the signal amplitude of each sensor with the mean value and triggers an alarm signal if the difference between the signal amplitude and the mean value exceeds a threshold value only occur with one or a few fuse wires.
  • an alarm signal is not triggered if such slow movements are caused by environmental influences, such as temperature changes, which are effective with a large number of safety wires.
  • This evaluation circuit has the disadvantage that it requires a large computing capacity in the case of a large number of sensors in order to form the mean value from the large number of signal amplitudes.
  • the task is to design the evaluation circuit so that the collection of a large number of signal amplitudes is not is required.
  • the signal from sensor 1 is fed via an amplifier 2 to the inputs of two low-pass filters 3, 4 connected in parallel. These two low-pass filters have different cutoff frequencies from one another.
  • the sensor signal has a typical course that lies within a characteristic frequency spectrum.
  • This frequency spectrum is different from other frequency spectra which have the signal profiles which are caused by other causes when the fuse wires are deflected. Other causes include temperature fluctuations, gusty winds, falling branches and branches.
  • the frequency spectra that arise here are partly above and partly below the frequency spectrum that arises when a safety wire is deflected by a human.
  • the cut-off frequency of the low-pass filter 3 becomes like this chosen that it lies above the frequency spectrum of the sensor signal, which arises when a wire is deflected by a human.
  • the low-pass filter 3 thus allows the entire frequencies to pass through to its cutoff frequency.
  • the other low-pass filter 4 on the other hand, has a cut-off frequency which is at the lower limit of the aforementioned frequency spectrum. This means that this frequency spectrum is not passed.
  • the outputs of the two low-pass filters 3, 4 are connected to a subtraction circuit 5, which forms the difference between the output signals of the two low-pass filters 3, 4.
  • a signal occurs at the output of the subtraction circuit 5, which corresponds to the frequency spectrum of the sensor signal, which arises when a wire is deflected by a human.
  • This signal is fed to the input of a threshold circuit 6. If the output signal of the subtraction circuit 5 exceeds a predetermined threshold value 7, then an alarm is triggered.
  • a signal from the comparator 6 is fed to a first alarm circuit 8.
  • the output of the subtraction circuit 5 is connected to a jump detector 9, ie to a differentiator, which forms the time differential of the output signal of the subtraction circuit. As a result, a rapid signal change is detected. Still the exit of amplifier 2 is connected to a further comparator 10. If the sensor signal exceeds a threshold value 11, then a gate circuit 12 is triggered thereby, which is further controlled by the differentiator 9. If the jump detector 9 generates an output signal corresponding to a rapid change in the sensor signal and if this sensor signal lies above the threshold value 11, corresponding to a high signal amplitude, then the gate circuit 12 generates an alarm signal which is fed to a second alarm circuit 13.
  • the circuit can be designed in such a way that when the two alarm circuits 8, 13 are activated at the same time, the alarm transmission in the first alarm circuit 8 is suppressed.
  • the signal of the sensor 1 is fed to a differentiator 14 via the amplifier 2.
  • This differentiator forms the time differential of the sensor signal supplied.
  • the output signal of the differentiator 14 is fed to a comparator 15.
  • Two threshold values 16 and 17 are present at this comparator 15.
  • the lower threshold value 16 lies at the lower limit of the time differential spectrum which occurs in the frequency spectrum of the sensor signal which arises when a wire is deflected by a human.
  • the upper threshold value 17 lies at the upper limit of the aforementioned time differential spectrum.
  • the comparator 15 lets through signals which lie within this time differential spectrum and which are then fed to the first alarm circuit 8.
  • the output of the differentiator 14 is also connected to the gate circuit 12, the further input of which is connected to the output of the comparator 10, the input of which, as in FIG. 1, is connected to the output of the amplifier 2.
  • the threshold value 11 is again applied to the comparator 10. The operation of this branch corresponds to that of the corresponding branch according to FIG. 1.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Fencing (AREA)
EP87106681A 1987-05-08 1987-05-08 Clôture de sécurité avec fils de sécurité fixés à des poteaux à travers de détecteurs Expired - Lifetime EP0289641B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE8787106681T DE3776899D1 (de) 1987-05-08 1987-05-08 Sicherungszaun mit ueber sensoren an pfosten befestigten sicherungsdraehten.
AT87106681T ATE72906T1 (de) 1987-05-08 1987-05-08 Sicherungszaun mit ueber sensoren an pfosten befestigten sicherungsdraehten.
EP87106681A EP0289641B1 (fr) 1987-05-08 1987-05-08 Clôture de sécurité avec fils de sécurité fixés à des poteaux à travers de détecteurs
IL82831A IL82831A0 (en) 1987-05-08 1987-06-09 Safety fence with safety wires connected to posts via sensors
US07/071,808 US4803468A (en) 1987-05-08 1987-07-10 Security fence with security wires fastened to posts via sensors
CA000542193A CA1276256C (fr) 1987-05-08 1987-07-15 Cloture de securite a fils de detection fixes aux piquets par des capteurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87106681A EP0289641B1 (fr) 1987-05-08 1987-05-08 Clôture de sécurité avec fils de sécurité fixés à des poteaux à travers de détecteurs

Publications (2)

Publication Number Publication Date
EP0289641A1 true EP0289641A1 (fr) 1988-11-09
EP0289641B1 EP0289641B1 (fr) 1992-02-26

Family

ID=8196965

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87106681A Expired - Lifetime EP0289641B1 (fr) 1987-05-08 1987-05-08 Clôture de sécurité avec fils de sécurité fixés à des poteaux à travers de détecteurs

Country Status (5)

Country Link
US (1) US4803468A (fr)
EP (1) EP0289641B1 (fr)
AT (1) ATE72906T1 (fr)
CA (1) CA1276256C (fr)
DE (1) DE3776899D1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5084697A (en) * 1989-03-01 1992-01-28 Hwang Shih Ming Error-free control circuit for alarm detectors
EP0612047A1 (fr) * 1993-02-19 1994-08-24 GEUTEBRÜCK GmbH Procédé pour analyser des signaux électroacoustiques
US5371488A (en) * 1993-05-27 1994-12-06 Waymax, Inc. Tension sensing security apparatus and method for fencing
US5438317A (en) * 1994-04-08 1995-08-01 Detection Systems, Inc. Glass break detection with noise riding feature
US5982291A (en) * 1997-03-31 1999-11-09 Williams; Julie A. Electric fence security system
US5852402A (en) * 1997-10-28 1998-12-22 Safeguards Technology, Inc. Intrusion detection system
US6578438B2 (en) 2001-08-17 2003-06-17 Integrated Detection Systems Taut wire sensor
US7594586B2 (en) * 2006-08-05 2009-09-29 Cai Edward Z Vacuum generating device for sealing perishable products and method of use
IL207723A0 (en) * 2010-08-19 2011-04-28 Magal Security Systems Ltd A sensor for taut wire fences
US9135795B2 (en) * 2010-08-19 2015-09-15 Magal Security Systems Ltd. Sensor for taut wire fences
US10192418B1 (en) 2018-06-11 2019-01-29 Geoffrey M. Kern System and method for perimeter security

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947835A (en) * 1974-07-01 1976-03-30 Gte Sylvania Incorporated Fence protection system
US4097025A (en) * 1976-07-19 1978-06-27 Electronic Surveillance Fence Security, Inc. Electronic fence surveillance apparatus
EP0053005A1 (fr) * 1980-11-20 1982-06-02 Stellar Systems, Inc. Système d'avertissement d'intrusion

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803548A (en) * 1971-08-18 1974-04-09 Us Army Fence tampering alarm system
DE2900444A1 (de) * 1979-01-08 1980-07-10 Licentia Gmbh Verfahren und schaltungsanordnung zur auswertung von ausgangssignalen von schallaufnehmern einer objektschutzueberwachungsanlage und zur erzeugung eines alarmsignals
US4307387A (en) * 1979-02-23 1981-12-22 Elliott Brothers (London) Limited Vibration-responsive intruder alarm system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947835A (en) * 1974-07-01 1976-03-30 Gte Sylvania Incorporated Fence protection system
US4097025A (en) * 1976-07-19 1978-06-27 Electronic Surveillance Fence Security, Inc. Electronic fence surveillance apparatus
EP0053005A1 (fr) * 1980-11-20 1982-06-02 Stellar Systems, Inc. Système d'avertissement d'intrusion

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
1982 CARNAHAN CONFERENCE ON SECURITY TECHNOLOGY, Lexington, Kentucky, 12.-14. Mai 1982, Seiten, 71-79; T. KOVATTANA: "Triaxial force sensor" *

Also Published As

Publication number Publication date
CA1276256C (fr) 1990-11-13
EP0289641B1 (fr) 1992-02-26
ATE72906T1 (de) 1992-03-15
US4803468A (en) 1989-02-07
DE3776899D1 (de) 1992-04-02

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