EP0817146B1 - Intrusion detection apparatus using leaky cables - Google Patents
Intrusion detection apparatus using leaky cables Download PDFInfo
- Publication number
- EP0817146B1 EP0817146B1 EP19970401544 EP97401544A EP0817146B1 EP 0817146 B1 EP0817146 B1 EP 0817146B1 EP 19970401544 EP19970401544 EP 19970401544 EP 97401544 A EP97401544 A EP 97401544A EP 0817146 B1 EP0817146 B1 EP 0817146B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- order
- cables
- tubes
- metal
- metal tubes
- 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
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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
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field
- G08B13/2497—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field using transmission lines, e.g. cable
Definitions
- the subject of the present invention is a device for detecting intrusions, of the type using radiating cables, arranged overhead, about a few dozen distant from each other centimeters to a few meters and extending parallel to each other along the area to be monitored.
- the device uses a known principle (EP 0 272 785) operating in transmission-reception under an appropriate frequency of a few tens of megahertz emitting an intrusion detection signal when, under the effect of an intrusion, the field electromagnetic outside and in the vicinity of cables is disturbed.
- the device is of the type comprising a transmitter connected by a coaxial cable to a first device transmission line and a connected receiver by a second coaxial cable to a second line of transmission of the device, as well as a connected computer to the transmitter and receiver to analyze the results detected signals and thus allow to indicate the appearance of an intrusion and locate it.
- a known principle EP 0 272 785
- the device is of the type comprising a transmitter connected by a coaxial cable to a first device transmission line and a connected receiver by a second coaxial cable to a second line of transmission of the device, as well as a connected computer to the transmitter and receiver to analyze the results detected signals and thus allow to indicate the appearance of an intrusion and locate it.
- a transmitter connected by
- FR-A-2 709 010 a functioning intrusion detection system according to the general principle described above and using radiant cables embedded in the ground, in order to limit and attempt to eliminate problems related to false alarms generated when the installation works in aerial, with parasitic variations of the environment, such as changes in humidity, water supply on the ground or in the basement, etc.
- the disadvantage of this kind of cable installation buried detection is that it entails an additional cost important due to the civil works it takes sometimes over very long lengths, using for example the construction of a slab in concrete in which the cables must be buried radiant detection, and under which to place wire mesh to eliminate disturbances due to changes in the humidity of the basement.
- the object of the invention is to provide a device of the aerial detector fence type, operating on a similar principle and providing a higher detection volume, circumscribed in a well demarcated area near the fence, allowing much lower installation cost than buried versions, with good reliability and elimination of parasitic alarms such as for example those due to the swinging of the foliage of a tree located outside the area under intrusion surveillance but close to him.
- the device according to the invention is characterized in that that the detection cables are made up of at at least two metal tubes arranged in parallel to each other and forming, with a third conductor electric, connected to the ground of the coaxial cables power / receive device, both lines transmission devices which are charged at their free end on their impedance feature.
- the third electrical conductor consists of a third metal tube placed between the other two.
- the third conductor electric consists of a grid or plane equivalent metal arranged on one side of the two tubes connected respectively to the transmitter and the receiver; in this case, the device works by being able detect only intrusions occurring from a side of the wire mesh or metal surface in question, a such installation being particularly suitable when it is a boundary fence with a public or passing place such as a road.
- end reflection may cause the appearance of a strong standing wave regime which prevent detection periodically along the line for all half wavelengths and which prevent a location of the position of the intrusion.
- the invention implements these principles of in a practical way, by conforming the detection cables in the form of two metal tubes suitably coupled with a third conductor connected to ground coaxial power / receive cables.
- Figure 1 shows schematically how can be realized a fence allowing the detection intrusions according to the invention.
- Figure 2 is a view similar to that of Figure 1 relative to a variant.
- Figure 3 is a diagram showing the connections between the fence and the device allowing the location of intrusions.
- Support posts are advantageously made of a material insulating dielectric, such as for example a composite fiberglass.
- Metal conductive tubes 1 and 3 are connected respectively by the coaxial conductors 4 and 5, to the transmitter E and to the receiver R of the device (figure 3).
- the mass of coaxial cables in other words their outer sheath, is connected to the third central conductor referenced 2 in the drawing.
- the tubes metallic 1 and 3 which together with the conductor central 2 the two coupled transmission lines of the device, are loaded at their free end on their characteristic impedance, respectively 6 and 7.
- the three conductors may consist of metal tubes of diameter approximately 40 mm and are arranged respectively 0.5 m, 1.25 m and 2 m from the ground.
- the support posts are arranged every 2 to 3 m.
- the length of tubes 1, 2 and 3 corresponds to the length of the perimeter to monitor.
- the detection volume has a shape section close to an ellipse having a width of the order of 3 4 m (either on each side of the fence in the order of 1.50 to 2 m), and a height of the order of 2.5 to 3 m.
- the monitored volume is therefore clearly delimited all around this fence.
- the conductive tube 2 has been replaced by a plane or wire mesh 12 connected to the ground of the cables supply coaxials 4 and 5.
- D the distance separating the tubes 1 and 3
- d the diameter of these tubes.
- Tubes 1 and 3 can be kept at a distance for example of approximately 100 mm from the plane of the mesh 12, by means of dielectric supports suitable, arranged every 2 to 3 m, for example as referenced in 9.
- detection is demarcated only on the side of the grid which carries the tubes, and the detection volume concerns a height of around 2.5 to 3 m, over a width of 1.5 to 2 m, beyond the plane of the wire mesh.
- the detection is obtained by measuring and analyzing the transmission coefficient obtained between the two coupled lines 1 and 3 (in cooperation with the line of mass 2 or 12).
- the operating frequency is usually from a few tens to 100 MHz.
- the invention is not limited to the embodiments illustrated and described.
- the diameter of the tubes used, as well as working frequencies can be changed according to needs.
- the transmission lines one above others by spreading them above the ground at intervals for example of the order of 40 cm to 1 m.
- the diameter of metal tubes for reasons manufacturing savings will advantageously be a few tens of millimeters, the example of 40 mm given is of course in no way limiting.
Description
La présente invention a pour objet un dispositif pour la détection d'intrusions, du type utilisant des câbles rayonnants, disposés en aérien, distants l'un de l'autre d'environ quelques dizaines de centimètres à quelques mètres et s'étendant parallèlement l'un à l'autre le long de la zone à surveiller.The subject of the present invention is a device for detecting intrusions, of the type using radiating cables, arranged overhead, about a few dozen distant from each other centimeters to a few meters and extending parallel to each other along the area to be monitored.
Le dispositif fait appel à un principe connu (EP 0 272 785) fonctionnant en émission-réception sous une fréquence appropriée de quelques dizaines de mégahertz émettant un signal de détection d'intrusions lorsque, sous l'effet d'une intrusion, le champ électromagnétique à l'extérieur et au voisinage des câbles est perturbé. Le dispositif est du type comprenant un émetteur relié par un câble coaxial à une première ligne de transmission du dispositif et un récepteur relié par un deuxième câble coaxial à une seconde ligne de transmission du dispositif, ainsi qu'un calculateur relié à l'émetteur et au récepteur pour analyser les résultats des signaux détectés et permettre ainsi d'indiquer l'apparition d'une intrusion et de la localiser. Mais un tel type d'installation est sujet à de fausses alarmes, telles que celles par exemple provoquées par le balancement dans le vent du feuillage d'un arbre proche.The device uses a known principle (EP 0 272 785) operating in transmission-reception under an appropriate frequency of a few tens of megahertz emitting an intrusion detection signal when, under the effect of an intrusion, the field electromagnetic outside and in the vicinity of cables is disturbed. The device is of the type comprising a transmitter connected by a coaxial cable to a first device transmission line and a connected receiver by a second coaxial cable to a second line of transmission of the device, as well as a connected computer to the transmitter and receiver to analyze the results detected signals and thus allow to indicate the appearance of an intrusion and locate it. But one this type of installation is subject to false alarms, such as those caused for example by the swaying the foliage of a nearby tree in the wind.
Le demandeur a déjà décrit (FR-A-2 709 010) une installation pour la détection d'intrusions fonctionnant selon le principe général décrit ci-dessus et utilisant des câbles rayonnants noyés dans le sol, ceci afin de limiter et tenter d'éliminer les problèmes liés aux fausses alarmes engendrées lorsque l'installation fonctionne en aérien, à des variations parasites de l'environnement, telles que modification de l'humidité, arrivée d'eau sur le sol ou dans le sous-sol, etc. L'inconvénient de ce genre d'installations à câbles de détection enterrés est qu'il entraíne un surcoût important dû aux travaux de génie civil qu'il faut effectuer, parfois sur de très grandes longueurs, en faisant appel par exemple à la construction d'une dalle en béton dans laquelle doivent être noyés les câbles rayonnants de détection, et sous laquelle il faut placer un grillage métallique pour éliminer les perturbations dues aux modifications d'humidité du sous-sol.The applicant has already described (FR-A-2 709 010) a functioning intrusion detection system according to the general principle described above and using radiant cables embedded in the ground, in order to limit and attempt to eliminate problems related to false alarms generated when the installation works in aerial, with parasitic variations of the environment, such as changes in humidity, water supply on the ground or in the basement, etc. The disadvantage of this kind of cable installation buried detection is that it entails an additional cost important due to the civil works it takes sometimes over very long lengths, using for example the construction of a slab in concrete in which the cables must be buried radiant detection, and under which to place wire mesh to eliminate disturbances due to changes in the humidity of the basement.
L'invention a pour objet de réaliser un dispositif du type clôture détectrice aérienne, fonctionnant selon un principe voisin et procurant un volume de détection plus haut, circonscrit dans une région bien délimitée voisine de la clôture, permettant un coût d'installation beaucoup plus faible que celui des versions enterrées, avec une bonne fiabilité et élimination d'alarmes parasites telles par exemple que celles dues au balancement du feuillage d'un arbre situé à l'extérieur du périmètre surveillé d'intrusions mais à proximité de lui.The object of the invention is to provide a device of the aerial detector fence type, operating on a similar principle and providing a higher detection volume, circumscribed in a well demarcated area near the fence, allowing much lower installation cost than buried versions, with good reliability and elimination of parasitic alarms such as for example those due to the swinging of the foliage of a tree located outside the area under intrusion surveillance but close to him.
Le dispositif conforme à l'invention, du type général précédemment décrit, se caractérise en ce que les câbles de détection sont constitués par au moins deux tubes métalliques disposés parallèlement l'un à l'autre et formant, avec un troisième conducteur électrique, relié à la masse des câbles coaxiaux d'alimentation/réception du dispositif, les deux lignes de transmission couplées du dispositif, lesquelles sont chargées à leur extrémité libre sur leur impédance caractéristique.The device according to the invention, of general type previously described, is characterized in that that the detection cables are made up of at at least two metal tubes arranged in parallel to each other and forming, with a third conductor electric, connected to the ground of the coaxial cables power / receive device, both lines transmission devices which are charged at their free end on their impedance feature.
Dans un mode de réalisation, le troisième conducteur électrique est constitué par un troisième tube métallique disposé entre les deux autres. Dans un autre mode de réalisation, le troisième conducteur électrique est constitué par un grillage ou plan métallique équivalent disposé d'un côté des deux tubes reliés respectivement à l'émetteur et au récepteur ; dans ce cas, le dispositif fonctionne en étant capable de ne détecter que les intrusions se produisant d'un côté du grillage ou plan métallique en question, une telle installation étant particulièrement adaptée lorsqu'il s'agit d'une clôture de délimitation avec un lieu public ou de passage tel par exemple qu'une route.In one embodiment, the third electrical conductor consists of a third metal tube placed between the other two. In one another embodiment, the third conductor electric consists of a grid or plane equivalent metal arranged on one side of the two tubes connected respectively to the transmitter and the receiver; in this case, the device works by being able detect only intrusions occurring from a side of the wire mesh or metal surface in question, a such installation being particularly suitable when it is a boundary fence with a public or passing place such as a road.
Sur une structure à deux câbles aériens ou plus, la réflexion en extrémité peut provoquer l'apparition d'un fort régime d'ondes stationnaires qui empêchent la détection périodiquement le long de la ligne pour toutes les demi-longueurs d'ondes et qui empêchent une localisation de la position de l'intrusion.On a structure with two overhead cables or more, end reflection may cause the appearance of a strong standing wave regime which prevent detection periodically along the line for all half wavelengths and which prevent a location of the position of the intrusion.
Pour éviter ce fonctionnement à fort régime d'ondes stationnaires, il est connu de charger l'extrémité des lignes de transmission au moyen d'impédances ; dans ce cas, pour localiser l'intrusion, il faut travailler successivement à des fréquences différentes, et selon la méthode connue du radar à impulsions synthétiques, il est possible de déterminer la position de l'intrusion au moyen d'un calcul de transformée de Fourrier.To avoid this high speed operation standing waves, it is known to charge the end of the transmission lines by means impedances; in this case, to locate the intrusion, you have to work successively at frequencies different, and according to the known method of radar to synthetic impulses it is possible to determine the position of the intrusion by means of a calculation of Fourrier transform.
L'invention met en oeuvre ces principes de façon pratique, en conformant les câbles de détection sous forme de deux tubes métalliques convenablement couplés avec un troisième conducteur relié à la masse des câbles coaxiaux d'alimentation/réception.The invention implements these principles of in a practical way, by conforming the detection cables in the form of two metal tubes suitably coupled with a third conductor connected to ground coaxial power / receive cables.
L'invention et sa mise en oeuvre apparaítront plus clairement à l'aide de la description qui va suivre, faite en référence aux dessins annexés dans lesquels :The invention and its implementation will appear more clearly from the description which will follow, made with reference to the accompanying drawings wherein :
La figure 1 montre schématiquement comment peut être réalisée une clôture permettant la détection des intrusions conformément à l'invention.Figure 1 shows schematically how can be realized a fence allowing the detection intrusions according to the invention.
La figure 2 est une vue semblable à celle de la figure 1 relativement à une variante.Figure 2 is a view similar to that of Figure 1 relative to a variant.
La figure 3 est un schéma montrant les connections entre la clôture et le dispositif permettant la localisation des intrusions.Figure 3 is a diagram showing the connections between the fence and the device allowing the location of intrusions.
En se reportant tout d'abord à la figure 1, on a montré une clôture permettant la détection d'intrusions, constituée essentiellement de trois tubes métalliques référencés 1, 2 et 3, supportés par des poteaux-supports référencés 8. Les poteaux-supports sont avantageusement constitués en un matériau diélectrique isolant, tel par exemple qu'un composite verre-résine.Referring first to Figure 1, we showed a fence allowing the detection intrusions, essentially consisting of three tubes metal referenced 1, 2 and 3, supported by support posts referenced 8. Support posts are advantageously made of a material insulating dielectric, such as for example a composite fiberglass.
Les tubes conducteurs métalliques 1 et 3
sont relies respectivement par les conducteurs coaxiaux
4 et 5, à l'émetteur E et au récepteur R du dispositif
(figure 3). La masse des câbles coaxiaux, autrement dit
leur gaine extérieure, est reliée au troisième
conducteur central référencé 2 au dessin. Les tubes
métalliques 1 et 3 qui constituent avec le conducteur
central 2 les deux lignes de transmission couplées du
dispositif, sont chargés à leur extrémité libre sur
leur impédance caractéristique, respectivement 6 et 7.Metal
Dans une réalisation, les trois conducteurs
peuvent être constitués par des tubes métalliques de
diamètre 40 mm environ et sont disposés respectivement
à 0,5 m, 1,25 m et 2m du sol. Les poteaux-supports sont
disposés tous les 2 à 3 m. Bien entendu, la longueur
des tubes 1, 2 et 3 correspond à la longueur du
périmètre à surveiller.In one embodiment, the three conductors
may consist of metal tubes of
diameter approximately 40 mm and are arranged respectively
0.5 m, 1.25 m and 2 m from the ground. The support posts are
arranged every 2 to 3 m. Of course, the length
of
En ce qui concerne la valeur de l'impédance
caractéristique des résistances 6 et 7 qui doivent
équiper le dispositif, la technique enseigne que ces
résistances sont données par la formule :
Dans l'exemple illustré à la figure 1, le volume de détection possède une section de forme voisine d'une ellipse ayant une largeur de l'ordre de 3 à 4 m (soit de chaque côté de la clôture de l'ordre de 1,50 à 2 m), et une hauteur de l'ordre de 2,5 à 3 m. Le volume surveillé est donc bien délimité tout autour de cette clôture. In the example illustrated in Figure 1, the detection volume has a shape section close to an ellipse having a width of the order of 3 4 m (either on each side of the fence in the order of 1.50 to 2 m), and a height of the order of 2.5 to 3 m. The monitored volume is therefore clearly delimited all around this fence.
Dans la réalisation illustrée à la figure
2, le tube conducteur 2 a été remplacé par un plan ou
grillage métallique 12 relié à la masse des câbles
coaxiaux d'alimentation 4 et 5.In the embodiment illustrated in the figure
2, the
De même que dans le mode de réalisation de
la figure 1, chacune des lignes de transmission est
chargée par son impédance caractéristique 16, 17, qui
dans ce cas peut être calculée par la formule
approchée :
Les tubes 1 et 3 peuvent être maintenus à
une distance par exemple d'environ 100 mm du plan du
grillage 12, au moyen de supports diélectriques
convenables, disposés tous les 2 à 3 m, par exemple
tels que référencés en 9.
Dans cette réalisation, la détection est délimitée au seul côté du grillage qui porte les tubes, et le volume de détection intéresse une hauteur de l'ordre de 2,5 à 3 m, sur une largeur de 1,5 à 2 m, au-delà du plan du grillage métallique.In this embodiment, detection is demarcated only on the side of the grid which carries the tubes, and the detection volume concerns a height of around 2.5 to 3 m, over a width of 1.5 to 2 m, beyond the plane of the wire mesh.
En relation avec la figure 3, on expliquera rapidement le fonctionnement du système.In relation to Figure 3, we will explain system operation quickly.
Comme pour les câbles détecteurs, la
détection est obtenue par la mesure et l'analyse du
coefficient de transmission obtenu entre les deux
lignes couplées 1 et 3 (en coopération avec la ligne de
masse 2 ou 12).As with sensor cables, the
detection is obtained by measuring and analyzing the
transmission coefficient obtained between the two
coupled
La fréquence de fonctionnement est habituellement de quelques dizaines à 100 MHz.The operating frequency is usually from a few tens to 100 MHz.
La localisation de l'intrusion le long de la ligne peut être obtenue au moyen de mesures successives à plusieurs fréquences, un calcul de transformée de Fourrier permettant d'obtenir une impulsion temporelle dont le retard donne la position de l'intrusion, selon la méthode connue du radar à impulsions synthétiques. Les modifications des signaux détectés entre l'émetteur E et le récepteur R sont adressées au calculateur C qui effectue les mesures et indique ainsi s'il se produit une intrusion, la localisation étant faite par comparaison de mesures successives, par exemple de fréquences sinusoïdales émises entre 60 et 70 MHz, selon la longueur des tronçons et la précision désirée de la localisation. La phase et l'amplitude des signaux reçus au récepteur sont analysées, envoyées au calculateur, lequel à son tour pilote l'émetteur et acquiert les résultats.The location of the intrusion along the line can be obtained by means of measurements successive at several frequencies, a calculation of Fourier transform allowing to obtain a time pulse whose delay gives the position intrusion, using the known radar method synthetic impulses. Signal modifications detected between transmitter E and receiver R are addressed to the computer C which performs the measurements and thus indicates if an intrusion occurs, the location being made by comparison of measurements successive, for example sinusoidal frequencies transmitted between 60 and 70 MHz, depending on the length of sections and the desired precision of localization. The phase and amplitude of signals received at the receiver are analyzed, sent to the computer, which at its turn controls the transmitter and acquires the results.
Bien entendu, l'invention n'est pas limitée aux modes de réalisation illustrés et décrits. En particulier, le diamètre des tubes utilisés, ainsi que les fréquences de travail peuvent être modifiés selon les besoins.Of course, the invention is not limited to the embodiments illustrated and described. In particular, the diameter of the tubes used, as well as working frequencies can be changed according to needs.
Pour des dispositifs de détection d'intrusions, plus particulièrement humaine, on placera avantageusement les lignes de transmission les unes au-dessus des autres en les répartissant au-dessus du sol à des intervalles par exemple de l'ordre de 40 cm à 1 m. Le diamètre des tubes métalliques pour des raisons d'économie de fabrication sera avantageusement de quelques dizaines de millimètres, l'exemple de 40 mm donné n'étant bien entendu nullement limitatif.For detection devices of intrusions, more particularly human, we will place advantageously the transmission lines one above others by spreading them above the ground at intervals for example of the order of 40 cm to 1 m. The diameter of metal tubes for reasons manufacturing savings will advantageously be a few tens of millimeters, the example of 40 mm given is of course in no way limiting.
Claims (8)
- Intrusion detection device of the type using radiating detection cables which are disposed overhead and spaced from one another by approximately several tens of centimetres to several metres and which extend parallel to one another along the zone to be monitored, wherein the device operates to as to transmit and receive at an appropriate frequency of several tens of megahertz, transmitting an intrusion detection signal when under the effect of an intrusion the electromagnetic field outside and within the vicinity of the cables is disturbed, the said device comprising a transmitter (E) connected by a coaxial cable (4) to a first transmission line (3) of the device and a receiver (R) connected by a coaxial cable (5) to a second transmission line (1) of the device, as well as a calculator (C) connected to the transmitter (E) and to the receiver (R) in order to analyse the results of the signals detected, the said device being characterised in that the said radiating detection cables consist of at least two metal tubes (1, 3) which are disposed parallel to one another and which with a third electrical conductor (2, 12) connected to the earth of the coaxial supply and receiving cables (4, 5) of the device form the two coupled transmission lines of the device which are loaded at their free end to their characteristic impedance (6 -7,16-17).
- Device as claimed in Claim 1, characterised in that the third electrical conductor consists of a third metal tube (2) disposed between the two others.
- Device as claimed in Claim 1, characterised in that the third electrical conductor consists of a grille or equivalent metal panel (12) which is disposed on one side of the two tubes (3, 1) connected respectively to the transmitter (E) and to the receiver (R).
- Device as claimed in any one of the preceding claims, characterised in that the metal tubes (1, 2, 3) have diameters of the order of several tens of millimetres.
- Device as claimed in Claim 4, characterised in that the metal tubes have diameters of the order of 40 mm.
- Device as claimed in any one of Claims 1, 2, 4 or 5, characterised in that in order to support the metal tubes (1, 2, 3) it comprises posts (8) made from a dielectric material such as glass-resin.
- Device as claimed in any one of Claims 1, 4 or 5 taken in combination with Claim 3, characterised in that in order to support the metal tubes (1, 3) it comprises spacers (9) fixed to the metal panel or grille (12).
- Device as claimed in any one of the preceding claims, characterised in that the transmission lines (1, 3) are placed one above the other and are distributed above the ground at intervals for example of the order of 40 cm to 1 m.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9608283A FR2750782B1 (en) | 1996-07-03 | 1996-07-03 | DEVICE FOR DETECTING INTRUSIONS OF THE TYPE USING RADIANT CABLES |
| FR9608283 | 1996-07-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0817146A1 EP0817146A1 (en) | 1998-01-07 |
| EP0817146B1 true EP0817146B1 (en) | 2002-03-20 |
Family
ID=9493670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19970401544 Expired - Lifetime EP0817146B1 (en) | 1996-07-03 | 1997-07-01 | Intrusion detection apparatus using leaky cables |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0817146B1 (en) |
| DE (1) | DE69711123D1 (en) |
| FR (1) | FR2750782B1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1280487C (en) * | 1986-11-06 | 1991-02-19 | Senstar-Stellar Corporation | Intrusion detection system |
| FR2709010B1 (en) * | 1993-08-12 | 1995-09-29 | Amp C3C | Installation for the detection of intrusions of the type using radiating cables buried in the ground. |
-
1996
- 1996-07-03 FR FR9608283A patent/FR2750782B1/en not_active Expired - Lifetime
-
1997
- 1997-07-01 DE DE69711123T patent/DE69711123D1/en not_active Expired - Lifetime
- 1997-07-01 EP EP19970401544 patent/EP0817146B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0817146A1 (en) | 1998-01-07 |
| FR2750782A1 (en) | 1998-01-09 |
| DE69711123D1 (en) | 2002-04-25 |
| FR2750782B1 (en) | 1998-10-02 |
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