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EP0294275B1 - Vorrichtung zur Kontrolle der Integrität irgendeiner Wand, metallisch oder nicht, zum automatischen Auslösen einer Intervention bei Anwendung von Gewalt gegen diese Wand - Google Patents

Vorrichtung zur Kontrolle der Integrität irgendeiner Wand, metallisch oder nicht, zum automatischen Auslösen einer Intervention bei Anwendung von Gewalt gegen diese Wand Download PDF

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Publication number
EP0294275B1
EP0294275B1 EP88401282A EP88401282A EP0294275B1 EP 0294275 B1 EP0294275 B1 EP 0294275B1 EP 88401282 A EP88401282 A EP 88401282A EP 88401282 A EP88401282 A EP 88401282A EP 0294275 B1 EP0294275 B1 EP 0294275B1
Authority
EP
European Patent Office
Prior art keywords
wall
frequency
condenser
variation
oscillator
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 - Lifetime
Application number
EP88401282A
Other languages
English (en)
French (fr)
Other versions
EP0294275A2 (de
EP0294275A3 (en
Inventor
Christophe Genevois
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.)
Axytel SA
Original Assignee
Axytel SA
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 Axytel SA filed Critical Axytel SA
Priority to AT88401282T priority Critical patent/ATE72349T1/de
Publication of EP0294275A2 publication Critical patent/EP0294275A2/de
Publication of EP0294275A3 publication Critical patent/EP0294275A3/fr
Application granted granted Critical
Publication of EP0294275B1 publication Critical patent/EP0294275B1/de
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
    • G08B13/22—Electrical actuation
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit

Definitions

  • the present invention relates to a device for checking the integrity of any metallic or non-metallic wall, intended to automatically trigger an intervention in the event of aggression committed against this wall.
  • Such devices exist, see for example FR-A-2269157.
  • the present invention relates to a device making it possible to permanently control the state of such a wall and to automatically control an intervention, as soon as an aggression is committed against this wall, this intervention being able to be constituted for example by an alteration or even a destruction of objects inside the protected enclosure.
  • this device for controlling the integrity of a wall intended to automatically trigger an intervention in the event of aggression committed against this wall, is characterized in that it comprises, on the external surface or internal of the wall, a capacitive sensor constituted by a thin flat capacitor matching the shape of the wall, and, on the internal side of this wall, an electronic monitoring circuit comprising a variable frequency oscillator to the control input of which is connected an armature of the capacitor carried by the surface of the wall and the other armature of which is connected to ground, and means for detecting the variation in frequency of the output signal of the oscillator resulting from a variation in capacitance of the capacitor, and to then deliver a signal alarm when an external attack on the wall causes a variation in the surface of the capacitor carried by this wall and consequently in the capacity thereof.
  • the external armature of the capacitor placed on the wall is connected to ground so that this armature serves as a Faraday cage protecting the electronic monitoring circuit with regard to external radioelectric attacks.
  • the electronic monitoring circuit comprises a temperature detection probe placed close to the internal surface of the wall and this temperature detection probe is connected to a temperature correction circuit to ensure a compensation for temperature variations, in a range preferably from - 40 ° C to + 60 ° C.
  • the device according to the invention which is shown as a whole in FIG. 1, is intended to permanently check the integrity of a wall 1, this wall forming a surface closed or not on itself, to delimit an enclosure of security containing items to be protected.
  • the device uses a capacitive sensor external formed as a plane capacitor 2 which is directly or indirectly applied on the outer surface 1a of the wall 1.
  • the capacitor comprises an external metal armature 2a, an inner metal frame 2b in contact 1 with the outer surface of the wall 1, and a dielectric intermediate layer 2c in the case where this wall 1 is made of a non-metallic material. If the wall 1 is metallic, it can itself serve as a frame, then being coated with a bonding varnish and insulation separating it from the external frame 2a.
  • the external armature is grounded so as to constitute a Faraday cage surrounding and protecting the various constituent elements of the electronic circuit which will be described later.
  • This capacitor is used as a surface integrity sensor since the capacitance of this capacitor is directly proportional to the instantaneous value of the surface of the plates of the capacitor, if it is assumed that the thickness of the dielectric layer 2c is constant . According to the invention, this property is used to detect an attack against the wall, attack resulting in a variation of the metallic surface of the capacitor 2.
  • This attack can be of two different types, namely a slow attack, for example as a result of a local temperature rise by means of a torch, in order to pierce the wall, and rapid aggression, for example as a result of the impact of a bullet puncturing the capacitor 2 and the wall 1, the reduction in area of the capacitor 2 resulting from the hole drilled by the bullet.
  • a slow attack for example as a result of a local temperature rise by means of a torch, in order to pierce the wall
  • rapid aggression for example as a result of the impact of a bullet puncturing the capacitor 2 and the wall 1, the reduction in area of the capacitor 2 resulting from the hole drilled by the bullet.
  • the device uses, to detect the aggression committed against the wall 1, a variable frequency oscillator 3 to the input of which is connected the capacitor 2 with variable capacity as a function of possible aggressions. More particularly, the internal armature 2b is connected to the input of the variable frequency oscillator 3, since the external armature 2a constitutes a ground plane for all of the electronic circuits.
  • the output of the variable frequency oscillator 3 is connected to an input of a frequency demodulator stage 4, the output of which is itself connected to a level 5.
  • the frequency demodulator 4 is advantageously constituted by a phase locked loop circuit.
  • the free oscillation frequency of this loop is then adjusted to the frequency of the variable frequency oscillator 3 and all the frequency offsets are then caught up by the servo-control of the phase locked loop.
  • an amplitude signal proportional to the deviation of the frequency from the reference frequency is obtained.
  • the output signal of the level detector 5 can be used for various purposes, for example to cause the destruction or at least the irreversible alteration of the objects protected by the wall 1 (destruction or coloring of banknotes for example).
  • the device according to the invention comprises a device which ensures the correction of the frequency measurement as a function of the ambient temperature which, by causing a more or less significant expansion of the surface S of the capacitor 2, generates a drift in the capacitance C.
  • the temperature correction device comprises a temperature detection probe 6 which is located in the immediate vicinity of the internal surface 1b of the wall 1. This probe 6 is connected to a temperature correction circuit 7 which is itself connected to the frequency demodulator 4. Circuit 7 operates to take account of slow variations in the ambient temperature, distinguishing them from rapid variations due to thermal stress. For this reason, circuit 7 has a slower response time than capacitor 2 in order to be able to make this difference.
  • the capacitor 2 formed on one outer surface of the wall 1 can be obtained by applying a first layer of metal (e.g. aluminum), by vapor deposition or electroplating, to form the internal reinforcement 2b of the capacitor, then application of a layer of insulating varnish of constant thickness to form the intermediate dielectric layer 2c, then application of a second metallic layer, by vacuum metallization or electroplating, to constitute the external armature 2a of the capacitor 2, and finally application of a layer of external protective varnish 8.
  • a first layer of metal e.g. aluminum
  • a layer of insulating varnish of constant thickness to form the intermediate dielectric layer 2c
  • a second metallic layer by vacuum metallization or electroplating
  • the electrical connection of the two metal armatures 2a, 2b to the internal electronic circuit can be carried out easily, as illustrated, by means of lead wires 9.10 passing through holes drilled in the wall 1, the wire 9 passes through a hole 11 formed in the metal layer 2b constituting the internal reinforcement, at the time of the constitution of this layer, thanks to the forecast, at the location of the hole 11, d 'an appropriate cache.
  • the wire 9 therefore crosses the internal frame 2b without being in contact with it.
  • the other wire 10 is directly connected to the internal frame 2b.
  • the varnish 2c constituting the intermediate dielectric layer is chosen so as to have the same coefficient of expansion as that of the wall 1 supporting the capacitor 2 forming a sensor.
  • the capacitor 2 is assumed to be used only as a wear detector.
  • a frequency meter 12 connected, by an interface, to a microcomputer 13 which analyzes, by its program, the frequency offsets.
  • the level detector 5 is also eliminated since the detection thresholds are determined by the program of the microcomputer 13.
  • the temperature correction circuit 7 is connected to the microcomputer 13 which corrects the frequency as a function of the temperature.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Processing Of Solid Wastes (AREA)

Claims (6)

1. Einrichtung zum Überwachen der Unversehrtheit einer Wand und zum automatischen Auslösen einer Intervention bei einer Einwirkung auf die Wand, gekennzeichnet durch einen auf der äußeren oder inneren Oberfläche der Wand angeordneten kapazitiven Aufnehmer, der aus einem dünnen, ebenen, der Form der Wand (1) angepaßten Kondensator (2) besteht, und durch eine auf der Innenseite der Wand befindliche elektronische Überwachungsschaltung, die einen frequenzveränderlichen Oszillator (3), mit dessen Steuereingang ein auf der Oberfläche der Wand angeordneter Belag (2b) des Kondensators (2) verbunden ist, während der andere Belag an Masse liegt, und eine Anordnung (4, 5; 12) zur Wahrnehmung einer Frequenzänderung des Ausgangssignales des Oszillators (3) enthält, welche aus einer Änderung der Kapazität des Kondensators resultiert, und zur entsprechenden Abgabe eines Alarmsignals, wenn eine äußere Einwirkung auf die Wand (1) eine Änderung der von dieser Wand getragenen Oberfläche des Kondensators (2) und dementsprechend von dessen Kapazität hervorruft.
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der äußere Belag (2a) des Kondensators (2), mit dem die Wand beschichtet ist, mit Masse verbunden ist und als Faraday-Käfig wirkt, der die elektronische Überwachungsschaltung gegen äußere Hochfrequenzeinwirkungen schützt.
3. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Anordnung zur Wahrnehmung einer Frequenzänderung des Ausgangssignals des Oszillators einen Frequenzdemodulator (4) enthält, der an den Ausgang des frequenzveränderlichen Oszillators (3) angeschlossen ist, und einen Schwellenwertdetektor (5) mit zwei Schwellen, der an den Ausgang des Frequenzdemodulators (4) angeschlossen ist und das Alarmsignal erzeugt.
4. Einrichtung nach Asnpruch 1 oder 2, dadurch gekennzeichnet, daß die Anordnung zur Wahrnehmung der Frequenzänderung des Ausgangssignals des Oszillators einen Frequenzmesser (12) enthält, der über eine Schnittstelle an einen Mikrocomputer (13) angeschlossen ist, der durch sein Programm die Frequenzabweichungen analysiert.
5. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sie eine Anordnung enthält, welche eine Korrektur der Frequenzmessung als Funktion der Umgebungstemperatur gewährleistet und einen Temperaturfühler (6) enthält, der in unmittelbarer Nähe der inneren Oberfläche (1b) der Wand (1) angeordnet und mit einer Temperaturkorrektionsschaltung (7) verbunden ist, die ihrerseits an die Anordnung (4, 5; 12) zur Wahrnehmung der Änderung der Frequenz des Ausgangssignals des Oszillators angeschlossen ist.
6. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der auf der äußeren Oberfläche (1a) der wand. (1) gebildete Kondensator (2) durch Aufbringen einer ersten Metallschicht durch Aufdampfen im Vakuum oder Galvanoplastik, um den inneren Belag (2b) des Kondensators zu bilden, ferner durch Auftragen einer Schicht aus Isolierlack mit konstanter Dicke, um die dielektrische Zwischenschicht (2c) zu bilden und weiterhin durch Auftragen einer zweiten Metallschicht durch Aufdampfen im Vakuum oder Galvanoplastik, um den äußeren Belag (2a) des Kondensators (2) zu bilden und schließlich durch Auftragen einer äußeren Schutzlackschicht (8) hergestellt ist.
EP88401282A 1987-05-27 1988-05-26 Vorrichtung zur Kontrolle der Integrität irgendeiner Wand, metallisch oder nicht, zum automatischen Auslösen einer Intervention bei Anwendung von Gewalt gegen diese Wand Expired - Lifetime EP0294275B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88401282T ATE72349T1 (de) 1987-05-27 1988-05-26 Vorrichtung zur kontrolle der integritaet irgendeiner wand, metallisch oder nicht, zum automatischen ausloesen einer intervention bei anwendung von gewalt gegen diese wand.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8707530 1987-05-27
FR8707530A FR2615987B1 (fr) 1987-05-27 1987-05-27 Dispositif de controle de l'integrite d'une paroi quelconque, metallique ou non, destine a declencher automatiquement une intervention en cas d'agression commise a l'encontre de cette paroi

Publications (3)

Publication Number Publication Date
EP0294275A2 EP0294275A2 (de) 1988-12-07
EP0294275A3 EP0294275A3 (en) 1988-12-14
EP0294275B1 true EP0294275B1 (de) 1992-01-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88401282A Expired - Lifetime EP0294275B1 (de) 1987-05-27 1988-05-26 Vorrichtung zur Kontrolle der Integrität irgendeiner Wand, metallisch oder nicht, zum automatischen Auslösen einer Intervention bei Anwendung von Gewalt gegen diese Wand

Country Status (7)

Country Link
US (1) US4884061A (de)
EP (1) EP0294275B1 (de)
AT (1) ATE72349T1 (de)
CA (1) CA1301878C (de)
DE (1) DE3868143D1 (de)
ES (1) ES2030183T3 (de)
FR (1) FR2615987B1 (de)

Families Citing this family (11)

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Publication number Priority date Publication date Assignee Title
FR2649748B1 (fr) * 1989-07-17 1991-10-11 Axyval Sa Systeme de protection de documents ou d'objets de valeur enfermes dans un contenant inviolable physiquement, qui passe par ailleurs par une succession d'etats logiques authentifies en nombre restreint
CH689131A5 (fr) * 1992-03-12 1998-10-15 Verres Ind Sa Dispositif d'alarme pour surveiller un espace délimité au moins en partie par une barrière superficielle.
US5506566A (en) * 1993-05-06 1996-04-09 Northern Telecom Limited Tamper detectable electronic security package
WO1996031856A1 (en) * 1995-04-06 1996-10-10 The Regents Of The University Of California Puncture detecting barrier materials
US5801340A (en) * 1995-06-29 1998-09-01 Invotronics Manufacturing Proximity sensor
AU2003258320A1 (en) * 2002-08-22 2004-03-11 Invisa, Inc. Security apparatus for the detection of approaching objects
DE10241709B4 (de) * 2002-09-09 2007-01-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Sicherungsverbundsystem
US7281667B2 (en) * 2005-04-14 2007-10-16 International Business Machines Corporation Method and structure for implementing secure multichip modules for encryption applications
DE102007013162A1 (de) * 2007-03-20 2008-09-25 Groß, Heinz, Dr. Ing. Urformverfahren zur Herstellung von Multifunktionsbauteilen
EP2281683B1 (de) 2009-08-04 2014-03-05 Weckerle GmbH Verfahren zur Herstellung eines gepressten Puderelements und eine entsprechende Vorrichtung
US20170102217A1 (en) * 2015-10-13 2017-04-13 Amos Golan Early warning projectile penetration system

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
US1180246A (en) * 1913-01-13 1916-04-18 Vault Prot Company Vault and safe construction.
US3633194A (en) * 1962-09-26 1972-01-04 Anoconda Wire And Cable Co Tamperproof barrier
US3550109A (en) * 1965-07-14 1970-12-22 Tomezo Kato Alarm device
US3763795A (en) * 1972-06-28 1973-10-09 Mosler Safe Co Alarm condition sensor
FR2269157A1 (en) * 1974-04-26 1975-11-21 Bichler Jacques Burglary alarm device wall etc. - has alarm circuit closed by burglary tool passed through wall
US4169260A (en) * 1978-04-11 1979-09-25 Mosler Safe Company Capacitive intrusion detector circuitry utilizing reference oscillator drift
FR2450464A1 (fr) * 1979-03-02 1980-09-26 Anvar Detecteur de proximite pour la realisation de dispositifs de protection des lieux et des biens contre les intrusions, et de dispositifs de comptage
DE3315831A1 (de) * 1983-04-30 1984-10-31 Karl Jürgen 7505 Ettlingen Schwarz Verfahren zur ueberwachung eines abgestellten objektes und schaltungsanordnung hierzu
DE3527873A1 (de) * 1985-08-02 1987-02-05 Siemens Ag Flaechenschutz gegen sabotage an einer einbruchmeldezentrale

Also Published As

Publication number Publication date
US4884061A (en) 1989-11-28
FR2615987B1 (fr) 1994-04-01
EP0294275A2 (de) 1988-12-07
ATE72349T1 (de) 1992-02-15
FR2615987A1 (fr) 1988-12-02
EP0294275A3 (en) 1988-12-14
ES2030183T3 (es) 1992-10-16
DE3868143D1 (de) 1992-03-12
CA1301878C (fr) 1992-05-26

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