EP0294275B1 - Device for monitoring the soundness of security wall, metallic or non-metallic, for automatically instigating an intervention in the event of any aggression used against it - Google Patents

Device for monitoring the soundness of security wall, metallic or non-metallic, for automatically instigating an intervention in the event of any aggression used against it 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
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Prior art keywords
wall
frequency
condenser
variation
oscillator
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EP88401282A
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German (de)
French (fr)
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EP0294275A2 (en
EP0294275A3 (en
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Christophe Genevois
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Axytel SA
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Axytel SA
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Priority to AT88401282T priority Critical patent/ATE72349T1/en
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    • 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.

Abstract

An apparatus for verifying the integrity of a wall automatically sets off an intervention in the case of an act committed against the wall. A capacitive sensor is formed on the external or internal surface of the wall and consists of a thin planar condenser matching the shape of the wall. An oscillator having variable frequency has its control input connected to a plate of the condenser, the other plate being connected to ground, and a circuit detects the variation of frequency of the output signal of the oscillator resulting from a variation of condenser capacitance.

Description

La présente invention concerne un dispositif de contrôle de l'intégrité d'une paroi quelconque métallique ou non, destiné à déclencher automatiquement une intervention en cas d'agression commise à l'encontre de cette paroi. De tels dispositifs existent, voir par exemple FR-A- 2269157.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.

Il existe actuellement un grand nombre d'articles produits, documents. ou supports qui sont particulièrement convoitables et qui doivent être protégés. Parmi ceux-ci on peut citer les billets de banque. les chèques ou carnets de chèque les cartes de crédit ou autres cartes utilisables en monétique, les documents secrets,microfilms,enregistrements magnétiques et/ou optiques etc... Tous ces objets à protéger sont généralement logés dans des enceintes de sécurité, enceintes qui sont délimitées chacune par une paroi séparant le milieu ambiant du volume interne dans lequel sont stockés les objets protégés.There are currently a large number of produced articles, documents. or supports which are particularly desirable and which must be protected. Among these are banknotes. checks or check books credit cards or other cards usable in electronic money, secret documents, microfilms, magnetic and / or optical recordings etc ... All these objects to be protected are generally housed in security enclosures, enclosures which are each delimited by a wall separating the ambient medium from the internal volume in which the protected objects are stored.

La présente invention concerne un dispositif permettant de contrôler en permanence l'état d'une telle paroi et de commander automatiquement une intervention, aussitôt qu'une agression est commise contre cette paroi, cette intervention pouvant être constituée par exemple par une altération ou même une destruction des objets se trouvant à l'intérieur de l'enceinte protégée.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.

A cet effet ce dispositif de contrôle de l'intégrité d'une paroi, destiné à déclencher automatiquement une intervention en cas d'agression commise à l'encontre de cette paroi, est caractérisé en ce qu'il comprend, sur la surface externe ou interne de la paroi, un capteur capacitif constitué par un condensateur plan mince épousant la forme de la paroi, et, du côté interne de cette paroi, un circuit électronique de surveillance comportant un oscillateur à fréquence variable à l'entrée de commande duquel est connectée une armature du condensateur porté par la surface de la paroi et dont l'autre armature est reliée à la masse, et des moyens pour détecter la variation de fréquence du signal de sortie de l'oscillateur résultant d'une variation de capacité du condensateur, et pour délivrer alors un signal d'alarme lorsqu'une agression externe sur la paroi provoque une variation de la surface du condensateur porté par cette paroi et par conséquent de la capacité de celui-ci.To this end, 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.

De préférence l'armature externe du condensateur plaqué sur la paroi est reliée à la masse si bien que cette armature sert de cage de Faraday protégeant le circuit électronique de surveillance à l'égard des agressions radio-électriques externes.Preferably 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.

Suivant une caractéristique complémentaire de l'invention le circuit électronique de surveillance comprend une sonde de détection de température placée à la proximité de la surface interne de la paroi et cette sonde de détection de température est connectée à un circuit de correction de température pour assurer une compensation des variations de température, dans une gamme allant de préférence de - 40°C à + 60°C.According to a complementary characteristic of the invention, 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.

On décrira ci-après, à titre d'exemples non limitatifs, diverses formes d'exécution de la présente invention en référence au dessin annexé sur lequel :

  • La figure 1 est un schéma synoptique d'un dispositif de contrôle de l'intégrité d'une paroi suivant l'invention.
  • La figure 2 est une vue en coupe de la paroi portant le capteur capacitif, réalisé sous la forme d'un condensateur plan.
  • La figure 3 est un schéma d'une variante d'exécution du dispositif.
Various embodiments of the present invention will be described below, by way of non-limiting examples, with reference to the appended drawing in which:
  • Figure 1 is a block diagram of a device for controlling the integrity of a wall according to the invention.
  • Figure 2 is a sectional view of the wall carrying the capacitive sensor, made in the form of a flat capacitor.
  • Figure 3 is a diagram of an alternative embodiment of the device.

Le dispositif suivant l'invention qui est représenté dans son ensemble sur la figure 1, est destiné à contrôler en permanence l'intégrité d'une paroi 1, cette paroi formant une surface fermée ou non sur elle-même, pour délimiter une enceinte de sécurité contenant des objets devant être protégés. Le dispositif utilise un capteur capacitif externe réalisé sous la forme d'un condensateur plan 2 qui est appliqué directement ou indirectement sur la surface externe 1a de la paroi 1. Ce condensateur comprend une armature métallique externe 2a, une armature métallique interne 2b en contact avec la surface externe 1a de la paroi 1, et une couche diélectrique intermédiaire 2c, dans le cas où cette paroi 1 est en un matériau non métallique. Si la paroi 1 est métallique, elle peut servir elle-même d'armature, en étant alors revêtue d'un vernis d'accrochage et d'isolation la séparant de l'armature externe 2a. De préférence l'armature externe est mise à la masse de manière à constituer une cage de Faraday entourant et protégeant les divers éléments constitutifs du circuit électronique qui sera décrit par la suite. Ce condensateur est utilisé en tant que capteur d'intégrité de surface étant donné que la capacité de ce condensateur est directement proportionnelle à le valeur instantanée de la surface des armatures du condensateur, si on suppose que l'épaisseur de la couche diélectrique 2c est constante. Suivant l'invention on utilise cette propriété pour détecter une agression à l'encontre de la paroi, agression se traduisant par une variation de la surface métallique du condensateur 2. Cette agression peut être de deux types différents à savoir une agression lente, par exemple par suite d'une élévation de température locale au moyen d'un chalumeau, en vue de percer la paroi, et une agression rapide, par exemple par suite de l'impact d'une balle perforant le condensateur 2 et la paroi 1, la réduction de surface du condensateur 2 résultant alors du trou percé par la balle.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. Preferably 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.

Le dispositif suivant l'invention utilise, pour détecter l'agression commise contre la paroi 1, un oscillateur à fréquence variable 3 à l'entrée duquel est connecté le condensateur 2 à capacité variable en fonction des agressions éventuelles. Plus particulièrement l'armature interne 2b est reliée à l'entrée de l'oscillateur à fréquence variable 3, étant donné que l'armature externe 2a constitue un plan de masse pour l'ensemble des circuits électroniques. L'oscillateur à fréquence variable 3 délivre à sa sortie un signal alternatif de fréquence f inversement proportionnelle à la capacité C du condensateur 2 autrement dit f = k/C. k étant une constante. Dans cette forme d'exécution la sortie de l'oscillateur à fréquence variable 3 est reliée à une entrée d'un étage démodulateur de fréquence 4 dont la sortie est elle-même reliée à un détecteur de niveau 5. Le démodulateur de fréquence 4 est avantageusement constitué par un circuit à boucle à verrouillage de phase. On règle alors la fréquence d'oscillation libre de cette boucle sur la fréquence de l'oscillateur à fréquence variable 3 et tous les décalages en fréquence sont alors rattrapés par l'asservissement de la boucle à verrouillage de phase. On obtient ainsi, à la sortie du démodulateur de fréquence 4, un signal d'amplitude proportionnelle à l'écart de la fréquence par rapport à la fréquence de référence.The device according to the invention 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 variable frequency oscillator 3 delivers at its output an alternating signal of frequency f inversely proportional to the capacitance C of the capacitor 2 in other words f = k / C. k being a constant. In this embodiment, 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. Thus, at the output of the frequency demodulator 4, an amplitude signal proportional to the deviation of the frequency from the reference frequency is obtained.

En fait on distingue en pratique deux types d'agression à savoir :

  • a) le franchissement rapide de la paroi 1 ou agression rapide qui crée, dans le signal de sortie de l'oscillateur à fréquence variable 3, un brutal décalage en phase sur une période;
  • b) l'agression lente ou usure (attaque par produit chimique à faible vitesse de réaction ou au chalumeau par exemple) qui se traduit par un décalage en fréquence progressif dans le temps et qui est directement proportionnel à la variation de la surface S du condensateur 2. Ces deux types d'agression peuvent être détectés par un seul et même circuit à savoir le démodulateur de fréquence 4. Celui-ci est relié au détecteur de niveau 5 qui peut être constitué par un amplificateur opérationnel à fenêtre à deux niveaux de détection. En effet si une agression par perçage ou usure engendre une diminution de la surface S,donc de la capacité C du condensateur 2. au contraire une agression thermique (par un chalumeau par exemple) engendre, dans un premier temps, une augmentation de la surface S et de la capacité C, par suite de la dilatation des armatures métalliques du condensateur 2, d'où la nécessité d'avoir deux seuils de détection. Le signal de sortie de l'amplificateur opérationnel provoque, aussitôt que l'un des deux seuils est franchi, l'enclenchement d'une bascule, à travers une porte logique OU si bien que le franchissement de l'un des seuils se traduit par l'enclenchement de la bascule et l'émission d'un front raide correspondant. Par ailleurs l'enclenchement de cette bascule assure la mémorisation de l'agression.
In fact there are in practice two types of aggression, namely:
  • a) rapid crossing of the wall 1 or rapid aggression which creates, in the output signal of the variable frequency oscillator 3, a sudden phase shift over a period;
  • b) slow aggression or wear (attack by chemical product at low reaction speed or with a blowtorch for example) which results in a progressive frequency shift over time and which is directly proportional to the variation of the surface S of the capacitor 2. These two types of aggression can be detected by a single circuit, namely the frequency demodulator 4. This is connected to the level detector 5 which can be constituted by an operational amplifier with a window with two detection levels . Indeed if an attack by drilling or wear generates a reduction in the surface S, therefore in the capacitance C of the capacitor 2. on the contrary a thermal attack (by a torch for example) generates, in a first step, an increase in the surface S and capacitance C, as a result of the expansion of the metal plates of capacitor 2, hence the need to have two detection thresholds. The output signal of the operational amplifier causes, as soon as one of the two thresholds is crossed, the triggering of a flip-flop, through a logic gate OR so that the crossing of one of the thresholds results in the triggering of the rocker and the emission of a corresponding steep front. Furthermore, the engagement of this rocker ensures the memorization of the aggression.

Le signal de sortie du détecteur de niveau 5 peut être utilisé à diverses fins, par exemple pour provoquer la destruction ou tout au moins l'altération irrémédiable des objets protégés par la paroi 1 (destruction ou coloration de billets de banque par exemple).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).

Le dispositif suivant l'invention comporte un dispositif qui assure la correction de la mesure de fréquence en fonction de la température ambiante qui, en provoquant une dilatation plus ou moins importante de la surface S du condensateur 2, engendre une dérive de la capacité C. Le dispositif de correction en température comprend une sonde de détection de température 6 qui est située à proximité immédiate de la surface interne 1b de la paroi 1. Cette sonde 6 est reliée à un circuit de correction de température 7 qui est lui-même connecté au démodulateur de fréquence 4. Le circuit 7 intervient pour tenir compte des variations lentes de la température ambiante, en les distinguant des variations rapides dues à une agression thermique. Pour cette raison le circuit 7 a un temps de réponse plus lent que le condensateur 2 afin de pouvoir effectuer cette différence.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.

Comme on peut mieux le voir sur la figure 2, le condensateur 2 formé sur la surface externe 1a de la paroi 1 peut être obtenu par application d'une première couche de métal (par exemple aluminium), par métallisation sous vide ou galvanoplastie, pour constituer l'armature interne 2b du condensateur, puis application d'une couche de vernis isolant d'épaisseur constante pour constituer la couche diélectrique intermédiaire 2c, puis application d'une seconde couche métallique, par métallisation sous vide ou galvanoplastie, pour constituer l'armature externe 2a du condensateur 2, et enfin application d'une couche de vernis de protection extérieur 8. La connexion électrique des deux armatures métalliques 2a,2b au circuit électronique interne peut s'effectuer aisément, de la manière illustrée, au moyen de fils conducteurs 9,10 passant à travers des trous percés dans la paroi 1, Le fil 9 passe à travers un trou 11 formé dans la couche métallique 2b constituant l'armature interne, au moment de la constitution de cette couche, grâce à la prévision, à l'endroit du trou 11, d'un cache approprié. Le fil 9 traverse par conséquent l'armature interne 2b sans être en contact avec celle-ci. L'autre fil 10 est relié directement à l'armature interne 2b. Le vernis 2c constituant la couche diélectrique intermédiaire est choisi de manière à avoir le même coefficient de dilatation que celui de la paroi 1 supportant le condensateur 2 formant capteur.As best seen in Figure 2, 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. 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.

Dans la variant d'exécution de l'invention représentée sur la figure 3, le condensateur 2 est supposé être utilisé uniquement en détecteur d'usure. Dans ce cas on peut utiliser, à la place de l'étage démodulateur de fréquence 4, un fréquencemètre 12 relié, par une interface, à un micro-ordinateur 13 qui analyse, par son programme, les décalages en fréquence. Dans cette forme d'exécution de l'invention le détecteur de niveau 5 est également supprimé car les seuils de détection sont déterminés par le programme du micro-ordinateur 13. Par ailleurs le circuit de correction de température 7 est connecté au micro-ordinateur 13 qui corrige la fréquence en fonction de la température.In the variant embodiment of the invention shown in FIG. 3, the capacitor 2 is assumed to be used only as a wear detector. In this case it is possible to use, instead of the frequency demodulator stage 4, a frequency meter 12 connected, by an interface, to a microcomputer 13 which analyzes, by its program, the frequency offsets. In this embodiment of the invention, the level detector 5 is also eliminated since the detection thresholds are determined by the program of the microcomputer 13. Furthermore, the temperature correction circuit 7 is connected to the microcomputer 13 which corrects the frequency as a function of the temperature.

Claims (6)

1. Integrity verification apparatus of a wall, adapted to automatically set off an intervention in the case of an aggressive act committed against this wall, characterized in that it comprises, on the external or internal surface of the wall, a capacitive sensor constituted by a planar thin condenser (2) matching the shape of the wall (1), and, on the internal side of this wall, an electronic surveillance circuit comprising a variable frequency oscillator (3) having a control input to which is connected an armature (2b) of the condenser (2) carried by the surface of the wall (1) and whose other winding (2a) is connected to mass, and means (4, 5; 12) for detecting the variation of frequency of the output signal of the oscillator (3), resulting in a variation in compacitance of the condenser, and for delivering thus an alarm signal when an external aggression on the wall (1) causes a variation of the condenser surface (2) carried by this wall and consequently the compacitance thereof.
2. Apparatus according to claim 1 characterized in that the external winding (2a) of the condenser (2) pressed on the wall is connected to the ground so that this winding serving as a Faraday cage protecting the electronic surveillance circuit with respect to external radio electric aggressions.
3. Apparatus according to any one of the preceding claims characterized in that the means for detecting the variation frequency of the oscillator output signal comprise a frequency demodulator (4) connected to the output of the variable frequency oscillator (3) and a level detector (5) having two thresholds connected to the output of the frequency demodulator (4) and emitting the alarm signal.
4. Apparatus according to any one of claims 1 and 2 characterized in that the means for detecting the variation frequency of the oscillator output signal comprise a frequency meter (12) connected, by an interface, to a microcomputer (13) which analyzes, by its program, the offsets in frequency.
5. Apparatus according to any one of the preceding claims characterized in that it comprises an apparatus which assures the correction of the frequency measurement with respect to the room temperature which comprises a temperature detection probe (6) which is situated immediately adjacent the internal surface (1b) of the wall (1), this probe (6) being connected to a temperature correction circuit (7) which is itself connected to the means (4, 5; 12) for detection of the variation of frequency of the output signal of the oscillator.
6. Apparatus according to any one of the preceding claims characterized in that the condenser (2) on the external surface (1a) of the wall (1) is obtained by application of a first layer of metal, by vacuum metallization or galvanoplasty to constitute the internal winding (2b) of the condenser, then application of an insulating varnish layer of constant thickness to constitute the intermediate dielectric layer (2c), then application of a second metallic layer, by vacuum metallization or galvanoplasty, to constitute the external winding (2a) of the condenser (2), and finally the application of a layer of an exterior protective varnish (8).
EP88401282A 1987-05-27 1988-05-26 Device for monitoring the soundness of security wall, metallic or non-metallic, for automatically instigating an intervention in the event of any aggression used against it Expired - Lifetime EP0294275B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88401282T ATE72349T1 (en) 1987-05-27 1988-05-26 DEVICE FOR CONTROLLING THE INTEGRITY OF ANY WALL, METALLIC OR NOT, FOR AUTOMATICALLY TRIGGERING AN INTERVENTION IN THE USE OF FORCE AGAINST THAT WALL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8707530A FR2615987B1 (en) 1987-05-27 1987-05-27 DEVICE FOR CONTROLLING THE INTEGRITY OF ANY WALL, METALLIC OR NOT, FOR AUTOMATICALLY TAKING ACTION IN THE EVENT OF AN AGGRESSION MADE AGAINST THIS WALL
FR8707530 1987-05-27

Publications (3)

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

Family

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Application Number Title Priority Date Filing Date
EP88401282A Expired - Lifetime EP0294275B1 (en) 1987-05-27 1988-05-26 Device for monitoring the soundness of security wall, metallic or non-metallic, for automatically instigating an intervention in the event of any aggression used against it

Country Status (7)

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

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CH689131A5 (en) * 1992-03-12 1998-10-15 Verres Ind Sa Warning device for monitoring a space defined at least partially by a surface barrier.
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
WO2004019062A2 (en) * 2002-08-22 2004-03-04 Invisa, Inc. Security apparatus for the detection of approaching objects
DE10241709B4 (en) * 2002-09-09 2007-01-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Composite security system
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Also Published As

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

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