EP0817146B1 - Dispositif pour la détection d'intrusions du type utilisant des câbles rayonnants - Google Patents
Dispositif pour la détection d'intrusions du type utilisant des câbles rayonnants 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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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
- G08B13/24—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.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
Description
Claims (8)
- Dispositif pour la détection d'intrusions du type utilisant des câbles rayonnants de détection disposés en aérien, distants l'un de l'autre d'environ quelques dizaines de centimètres à quelques mètres, s'étendant parallèlement l'un à l'autre le long de la zone à surveiller, le dispositif 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, ledit dispositif comprenant un émetteur (E) relié par un câble coaxial (4) à une première ligne de transmission (3) du dispositif, et un récepteur (R) relié par un câble coaxial (5) à une seconde ligne (1) de transmission du dispositif, ainsi qu'un calculateur (C) relié à l'émetteur (E) et au récepteur (R) pour analyser les résultats des signaux détectés, ledit dispositif étant caractérisé en ce que lesdits câbles rayonnants de détection sont constitués par au moins deux tubes métalliques (1, 3) disposés parallèlement l'un à l'autre et formant avec un troisième conducteur électrique (2, 12) relié à la masse des câbles (4, 5) coaxiaux d'alimentation et de réception du dispositif, les deux lignes de transmission couplées du dispositif, lesquelles sont chargées à leur extrémité libre sur leur impédance caractéristique (6 - 7, 16 - 17).
- Dispositif selon la revendication 1, caractérisé en ce que le troisième conducteur électrique est constitué par un troisième tube métallique (2) disposé entre les deux autres.
- Dispositif selon la revendication 1, caractérisé en ce que le troisième conducteur électrique est constitué par un grillage ou plan métallique (12) équivalent disposé d'un côté des deux tubes (3, 1) reliés respectivement à l'émetteur (E) et au récepteur (R).
- Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les tubes métalliques (1, 2, 3) ont des diamètres de l'ordre de quelques dizaines de millimètres.
- Dispositif selon la revendication 4, caractérisé en ce que les tubes métalliques ont des diamètres de l'ordre de 40 mm.
- Dispositif selon l'une quelconque des revendications 1, 2, 4 ou 5, caractérisé en ce qu'il comprend, pour supporter les tubes métalliques (1, 2, 3), des poteaux (8) réalisés en un matériau diélectrique tel que verre-résine.
- Dispositif selon l'une quelconque des revendications 1, 4 ou 5 prise en combinaison avec la revendication 3, caractérisé en ce qu'il comprend pour supporter les tubes métalliques (1, 3) des entretoises (9) fixées au plan ou grillage métallique (12).
- Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les lignes de transmission (1, 3) sont placées les unes au-dessus des autres en étant réparties au-dessus du sol à des intervalles par exemple de l'ordre de 40 cm à 1 m.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9608283 | 1996-07-03 | ||
FR9608283A FR2750782B1 (fr) | 1996-07-03 | 1996-07-03 | Dispositif pour la detection d'intrusions du type utilisant des cables rayonnants |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0817146A1 EP0817146A1 (fr) | 1998-01-07 |
EP0817146B1 true EP0817146B1 (fr) | 2002-03-20 |
Family
ID=9493670
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19970401544 Expired - Lifetime EP0817146B1 (fr) | 1996-07-03 | 1997-07-01 | Dispositif pour la détection d'intrusions du type utilisant des câbles rayonnants |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0817146B1 (fr) |
DE (1) | DE69711123D1 (fr) |
FR (1) | FR2750782B1 (fr) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1280487C (fr) * | 1986-11-06 | 1991-02-19 | Senstar-Stellar Corporation | Systeme detecteur d'intrusion |
FR2709010B1 (fr) * | 1993-08-12 | 1995-09-29 | Amp C3C | Installation pour la détection d'intrusions du type utilisant des câbles rayonnants noyés dans le sol. |
-
1996
- 1996-07-03 FR FR9608283A patent/FR2750782B1/fr not_active Expired - Lifetime
-
1997
- 1997-07-01 EP EP19970401544 patent/EP0817146B1/fr not_active Expired - Lifetime
- 1997-07-01 DE DE69711123T patent/DE69711123D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69711123D1 (de) | 2002-04-25 |
FR2750782A1 (fr) | 1998-01-09 |
EP0817146A1 (fr) | 1998-01-07 |
FR2750782B1 (fr) | 1998-10-02 |
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