EP2734986B1 - Vorrichtung zur eindringungserkennung - Google Patents

Vorrichtung zur eindringungserkennung Download PDF

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Publication number
EP2734986B1
EP2734986B1 EP12743699.6A EP12743699A EP2734986B1 EP 2734986 B1 EP2734986 B1 EP 2734986B1 EP 12743699 A EP12743699 A EP 12743699A EP 2734986 B1 EP2734986 B1 EP 2734986B1
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EP
European Patent Office
Prior art keywords
elements
openings
vertical wall
wire
wires
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Active
Application number
EP12743699.6A
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English (en)
French (fr)
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EP2734986A1 (de
Inventor
Arnaud Flegeo
Jean-Luc AUVRAY
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Eryma Sas
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Eryma Sas
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Application filed by Eryma Sas filed Critical Eryma Sas
Publication of EP2734986A1 publication Critical patent/EP2734986A1/de
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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
    • G08B13/122—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a perimeter fence
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H17/00—Fencing, e.g. fences, enclosures, corrals
    • E04H17/02—Wire fencing, e.g. made of wire mesh
    • E04H17/127—Stretcher-type wire fencing; Tensioning devices for wire fencing
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires

Definitions

  • the present invention relates to a fence or fence section consisting of a sheet of son stretched between posts, and relates more particularly to an intrusion detection device integrated in such a fence to detect intrusions or attempts to intrude into a fence. the area protected by the fence.
  • Intrusion detection is generally based on the detection of the movement of threads of the web, this movement of thread taking place when an individual tries to pass through the fence by removing the wire from its normal position or by cutting it.
  • the son of the sheet are stretched between two end posts and the means for detecting the movement of the son of the sheet are mounted on an intermediate post disposed generally equidistant from the end posts.
  • An independent detector is associated with each wire to detect the movement of the latter.
  • the intermediate post carries support heads mounted oscillating independently of each other and each of which is fixed a thread of the web with tension equalization on each side.
  • a portion of flexible envelope of a chamber filled with a fluid is associated with each of said support heads in such a way that the oscillations of said support head cause deformation of the portion of the flexible envelope which then generates a pressure difference in the fluid.
  • a pressure sensor associated with the chamber is then responsible for generating a signal representative of this pressure difference.
  • the detection means consist of the oscillating mounted support heads, the flexible envelope enclosure and the pressure sensor.
  • the voltage balance on each side of the corresponding support head is broken.
  • the support head pivots about its axis and this pivoting is detected, via the pressure change in the chamber filled with fluid, by the pressure sensor.
  • Each support head functions as an independent detector.
  • This type of installation is also very sensitive to the outside temperature which can lead to dilation and / or contraction of the wires and poles and, in the same manner as before, move the support heads away from their normal position.
  • the current solution is to increase the stability of the posts by adding struts and / or over-dimensioning the concrete pads in which they are sealed. This solution is however ineffective compared to the expansion and compression of the son and / or poles and is also very expensive to implement.
  • US 4,683,356 discloses an intrusion detection device for a fence wire web consisting of two end posts between which the wires are stretched substantially horizontally, having detection means adapted to detect the movement of at least one wire with respect to other wires, said detection means comprising a first element and a second element mounted one above the other and each of which is fixed a corresponding wire, said first and second elements being able to move in translation and in rotation relative to each other, and a detecting member for detecting movement of the first member relative to the second member.
  • the first and the second elements are, however, substantially different from each other.
  • An object of the invention is to provide a detection device which is robust to field movements and temperature changes, simple and inexpensive to implement.
  • any tensile force exerted on one of the wires at a point thereof, located between the end posts causes a displacement in translation and / or in rotation of the corresponding element with respect to an element placed below and / or a member placed above, which displacement is detected by the detection member.
  • said first and second elements are substantially in contact with each other.
  • each of said first and second elements is free to rotate about a substantially vertical axis of rotation.
  • Said first and second elements are for example rotatable about a substantially vertical axial rod extending along said axis of rotation, which axial rod is assembled to an intermediate pole placed between said end posts.
  • each of said first and second elements advantageously has a recessed or I-shaped configuration.
  • Each of said first and second elements then has a vertical wall to which is attached a corresponding wire and upper and lower horizontal walls. extending from the ends of the vertical wall, said upper and lower horizontal walls being provided with first openings disposed along said axis of rotation for the passage of the axial rod.
  • the first and second elements are coupled together by coupling means so as to be pivotable and / or slide relative to each other along a substantially horizontal axis.
  • the first and second elements also have a recessed or I-shaped configuration, namely each having a vertical wall to which a corresponding wire is attached and upper and lower horizontal walls extending to from the ends of the vertical wall, said means of coupling being assembled to the walls of said first and second elements.
  • the detection member advantageously comprises a sensor cable, sensitive to pressure, passing through the upper and lower horizontal walls of the first and second elements via second openings arranged along a second axis substantially parallel to the axis of rotation, the dimensions of the second openings being substantially equal to the dimensions of the cross section of the detector cable.
  • the second openings of the upper and lower horizontal walls of the element are no longer aligned with the second openings of the other elements, especially with those of adjacent elements placed above and below the element under consideration.
  • the sensor cable then undergoes pressure or compression at its second openings. This compression of the cable indicates that the element has moved and triggers the sending of an alarm signal.
  • the device further comprises at least one shim capable of being introduced into a second opening of the lower and upper horizontal walls of the first and second elements.
  • at least one shim capable of being introduced into a second opening of the lower and upper horizontal walls of the first and second elements.
  • two shims are arranged in the second opening on either side of the sensor cable in the direction of movement of the element. These wedges can be used to adjust the size of the second opening and to adjust the intensity of the compression for a given displacement of the element.
  • each shim has a height greater than the thickness of the lower or upper horizontal wall.
  • the shim has a height twice the thickness of the lower or upper horizontal wall.
  • each of said first and second elements is equipped with an assembly means for fixing the wire corresponding to the vertical wall of the element.
  • the position of the assembly means on the vertical wall is vertically adjustable.
  • the invention also relates to a fence comprising one or more son plies in succession remarkable in that it is equipped with an intrusion detection device as defined above.
  • the invention is described below through three embodiments of the detection device according to the invention each comprising identical or substantially identical elements mounted on one another, able to move in translation and / or in rotation. relative to each other and to which the fence wires are rigidly attached, and a detection member adapted to detect the displacement of an element by relative to the element immediately above and / or immediately below when an external force is applied to the wire attached to this element.
  • a first embodiment is illustrated by the Figures 1 to 10 .
  • the figure 1 is a sheet of stretched son intended to form a fence section whose length is in practice of the order of 50 meters.
  • This fence section is disposed along the perimeter of an area to be protected. It has two end posts PE between which are spread horizontally F son at regular intervals. Equidistant from the end posts PE is an intermediate detector post PI on which the detection device 1 of the invention is mounted. The posts are sealed in concrete pads P cast in the ground. Each post is advantageously surmounted by an additional inclined portion, conventionally referred to as B-bonnet, extending outwardly of the zone to be protected, as shown more particularly in FIG. figure 3 . F wires are also stretched between the flaps of the PE end posts.
  • the intermediate sensor post PI is equipped with a detection device 1 able to detect any displacement of at least one wire relative to another wire.
  • the detection device 1 comprises a plurality of elements 2, identical or substantially identical, rotatable about an axial rod 3 extending along a substantially vertical axis X, said elements being mounted one above the other and each element being substantially in contact with the element immediately above and / or the element immediately below.
  • the axial rod 3, of circular section is fixed by suitable fixing means to the intermediate pole PI.
  • the means of fixing 4 are for example constituted by a U-shaped part 4 whose base is provided with an opening for the passage of the axial rod 3 and whose branches are screwed to the P1 post as shown in more detail in FIG. figure 4 .
  • the elements 2 are rotatable about the axis of rotation X independently of each other.
  • a wire F is fixed to each element 2 by assembly means 27 which will be described later. Any force exerted on the wire F then causes a rotation of the corresponding element 2 around the axis X. This rotational movement is detected by a detection member in the form of a sensor cable 6, visible on the figure 5 , sensitive to pressure.
  • This cable is for example a cable comprising carbon and two copper wires and a high density polyethylene sheath, such as the Mayser cable EKS002_commercialized by the company Mayser. The resistance of this cable varies according to the intensity of the pressure applied to it.
  • This cable is passed through the elements 2 of the device so that, when one of the elements 2 is rotated about the X axis under the effect of a force applied to the corresponding wire F, the sensor cable 6 is compressed at the contact area with the other elements and triggers the sending of an alarm signal.
  • This cable 6 is protected from the animals by a protective cover 28 mounted on each of the elements 2 and visible on the Figures 2 to 4 and the figure 10 .
  • tabs 7 are provided on the device for carrying an outer cover (not shown) extending along the pole PI and to make invisible the detection device.
  • the arrangement of the sensor cable 6 with the elements 2 is more particularly shown to Figures 5 to 9 .
  • the figure 5 is an enlarged view of detail D2 of the figure 3 , in which the protective covers 28 mounted on each of the elements 2 have been removed.
  • the Figures 6 to 9 represent different views of an element 2 traversed by the detector cable 6.
  • Element 2 comprises a vertical wall 20 and two parallel horizontal walls 21, 22 extending from the ends of the vertical wall so as to form a recessed U-shaped or I-shaped part.
  • Circular openings 23 and 24, arranged on the axis X, are formed in the horizontal walls 21, 22 for the passage of the axial rod 3.
  • Other openings, 25 and 26, arranged along an axis Y parallel to the axis X, are formed in the horizontal walls 21, 22 for the passage of the sensor cable 6.
  • the size of the openings 25 and 26 is substantially equal to or slightly greater than the size of the section of the sensor cable 6. As described below, the size of the openings 25 and 26 may be adapted by means of shims.
  • the wire F is fixed rigidly on the vertical wall by an assembly means 27.
  • This assembly means comprises a plate 271 provided in its lower part with a tab 272 extending perpendicular to the plate 271 and intended to come into abutment against the vertical wall 20 or to be introduced into a slot 201 of the vertical wall 20.
  • the plate 271 is connected to the vertical wall by a screw 273 and a nut 274, a slot 201 being formed in the vertical wall for the passage
  • the light 201 is preferably oblong to allow adjustment of the vertical position of the assembly means.
  • the width of the tab 272 is taken slightly less than the width of the light 201 so that the distal end of the tab 272 can be introduced into the light 201.
  • the element 2 is preferably a one-piece piece, obtained for example by molding a plastic material.
  • the element 2 can also be made of metal by folding and drilling a plate. In this second case, it may be difficult to obtain a precise alignment of the openings 23 and 24 and / or the openings 25 and 26 except to have very expensive advanced equipment.
  • the element 2 is made from several pieces, a U-shaped support piece made by folding and two plates 212 and 222.
  • the U-shaped support piece comprises a vertical base 200 and two parallel branches 211 and 221 extending from the ends of the base 200 perpendicular to it.
  • the wafers 212 and 222 are fixed on the external face of the branches 211 and 221 by screws 213 and 223.
  • the horizontal wall 21 of the element 2 is then constituted by the branch 211 and the plate 212, the horizontal wall 22 is formed by the branch 221 and the plate 222 and the base 200 of the support part constitutes the vertical wall 20.
  • the openings 23 and 24 are formed in the branches 211 and 221 of the support part and the apertures 25 and 26 are made in platelets 212 and 222.
  • the vertical wall 20 is advantageously equipped with a bracket 202 extending inwardly of the U along a longitudinal edge of the vertical wall and perpendicular thereto.
  • the protective cover 28 (visible on the figure 10 ) it allows to surround the detector cable 6 to protect it from external pollution and / or dust and / or to prevent foreign bodies, for example animals or branches, from coming into contact with the cable and triggering false alarms.
  • the protective cover 28 comprises a U-shaped body 280 and two legs 281 provided with screws 282 for fixing the cover 28 to the vertical wall 20.
  • rigid shims 260 are advantageously introduced into the opening 26 of the element 2, on either side of the sensor cable 6, in the direction of movement of the element around the axis of rotation, the bar of the T resting by its lower edge on the upper face of the plate 222 and the leg of the T being inserted into the opening 26.
  • the length of the leg of the T is greater than the thickness of the plate 222 so that said leg opens into the opening 25 of the element disposed immediately below.
  • the length of the leg is preferably at least equal to the total thickness of the plates 212 and 222.
  • the device operates as follows. In the absence of any force exerted on the wires F of the fence, the openings 25 and 26 of all the elements 2 are aligned on the Y axis. No pressure is exerted on the sensor cable.
  • this element pivots around the axial rod 3.
  • the elements 2 of the device being independent of one another, the position of the other elements, in particular adjacent elements, is not modified by this force.
  • the wall 21 of the element 2 considered shifts relative to the wall 22 of the element placed above.
  • the wall 22 of this element shifts relative to the wall 21 of the element placed below.
  • the openings 25 and 26 of this element are no longer aligned with those of the other elements of the device.
  • the sensor cable 6 is then compressed in two places at its openings 25 and 26. The movement of the element 2 is then detected.
  • This detection device is not very sensitive to ground movements because it detects the relative displacement of each element 2 relative to adjacent elements.
  • each element undergoes a displacement which is slightly greater than that of the element placed immediately below and slightly lower than that of the element placed immediately above.
  • the openings 25 and 26 of the element in question are therefore slightly offset with respect to those of the adjacent elements. If the openings 25 or 26 are slightly larger than the section of the sensor cable, this small displacement of the elements 2 is not detected by the sensor cable 6.
  • the wedges 260 are used to adjust the sensitivity level of the device. The sensitivity of the detection will be greater or less depending on the thickness of the shims. It is also possible to change the sensitivity of the detection according to the vertical position of the element. For example, shims having a first thickness up to a height of 1.40 meters and shims having a second thickness beyond 1.40 meters can be used.
  • This device is very simple to install on the PI post.
  • the axial rod 3 is inserted into the openings 23 and 24 of the elements 2 to be mounted on each other and in the opening of the fasteners 4, the assembly then being fixed to the post PI by the fasteners 4.
  • elements 2 are then locked in rotation relative to one another by screws V visible on the Figures 7 and 8 in such a way that the openings 25 and 26 of the set of elements 2 are aligned with the Y axis.
  • the sensor cable 6 is then introduced into the openings 25 and 26 thus aligned and the screws V are removed.
  • the wires F are fixed to the elements 2 by the assembly means 27.
  • the wedges 260 are put in place in the openings 25, 26 to adjust the detection sensitivity of each element.
  • the resistance of the detector cable 6 varies according to the intensity of the pressure.
  • the intensity of the pressure on the cable is low (low displacement of the element 2)
  • the resistance of the cable is high, of the order of 200 ohms in the case of the Mayser cable referenced above, and when the intensity the pressure on the cable is high (strong displacement due to the element 2), the resistance of the cable is weak, less than 100 ohms. It is therefore possible to provide different actions depending on the value of the resistance of the measured cable. If the resistance is between 100 and 200 ohms, no alarm signal is transmitted. For example, it is sufficient to trigger a projector and / or a video camera disposed near the fence. If the resistance is less than 100 ohms, an alarm signal is transmitted to a monitoring center.
  • a sensor cable cooperates with openings in the elements of the device to detect the relative movement of an element relative to the other elements.
  • the sensor cable 6 is replaced by a switch 6 'disposed in the lower part of the element 2', on the branch 221 'of the support piece. Platelets 212 and 222 are removed.
  • This switch comprises an elastic arm 61 ' movable between a rest position (or extended position) and a retracted position.
  • the elastic arm passes through the branch 221 'of the element 2' via an opening. Its distal end is equipped with a sphere 62 '.
  • the elastic arm 61 ' is in the rest position, the sphere 62' is present in a housing 214 'formed in the branch 211' of the element placed below.
  • the detection device is mounted on an intermediate pole PI and each element 2 is rotatable about an axis X.
  • the elements 2 "of the detection device 1" are coupled together by coupling means 29 so as to be pivotable and / or horizontally slide relative to each other along a substantially horizontal axis. With this embodiment, it is no longer necessary to mount the detection device on an intermediate pole.
  • the elements 2 each comprise a vertical wall to which is attached a wire F and upper and lower horizontal walls extending from the ends of the vertical wall.
  • a U-shaped part whose base 200 "forms the vertical wall and the branches 211" and 221 “form the upper and lower horizontal walls, openings 25" and 26 “(not shown in the figures) are formed in the horizontal walls superior and
  • the shims 260 are advantageously introduced on either side of the detector cable into the openings 26" and 25 "in order to prevent the scissors effect on the cable.
  • the first part of the coupling means consists for example of a substantially horizontal rod 291, of circular section, extending along the Z axis and fixed to the vertical wall of the first element as illustrated in FIGS. Figures 13 to 15 .
  • the second part of the coupling means consist of lugs 292 extending on either side of the vertical wall of the second element, said lugs being provided with bores intended to receive the rod 291 so that the second element can slide and / or rotate around this rod.
  • This third embodiment has the main advantage of not requiring an intermediate pole for mounting on the fence.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Burglar Alarm Systems (AREA)

Claims (13)

  1. Eindringerfassungsvorrichtung für eine Lage von Drähten eines Zauns, der aus zwei Endpfosten (PE) besteht, zwischen denen die Drähte (F) im Wesentlichen waagrecht gespannt sind,
    dadurch gekennzeichnet, dass sie Erfassungseinrichtungen aufweist, die fähig sind, die Verschiebung mindestens eines Drahts bezüglich der anderen Drähte zu erfassen, wobei die Erfassungseinrichtungen aufweisen:
    - im Wesentlichen gleiche, mindestens erste und zweite Elemente (2, 2', 2"), die übereinander montiert sind und an jedem von denen ein entsprechender Draht (F) befestigt ist, wobei die ersten und zweiten Elemente fähig sind, sich in Translations- und/oder Rotationsrichtung zueinander zu verschieben, und
    - ein Erfassungsorgan (6, 6', 6"), um die Verschiebung des ersten Elements bezüglich des zweiten Elements unter der Wirkung einer auf den am ersten Element befestigten Draht angewendeten Kraft zu erfassen.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die ersten und zweiten Elemente (2) im Wesentlichen miteinander in Kontakt sind.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass jedes der ersten und zweiten Elemente (2, 2') um eine im Wesentlichen senkrechte Drehachse (X) frei drehbar ist.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die ersten und zweiten Elemente (2, 2') um eine im Wesentlichen senkrechte axiale Stange (3) drehbeweglich sind, die sich entlang der Drehachse (X) erstreckt, wobei die axiale Stange an einen Zwischenpfosten (PI) angefügt ist, der zwischen den Endpfosten angeordnet ist.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die ersten und zweiten Elemente (2, 2') je eine senkrechte Wand (20), an der ein entsprechender Draht befestigt ist, und eine obere und eine untere waagrechte Wand (21, 22) aufweisen, die sich ausgehend von den Enden der senkrechten Wand erstrecken, wobei die obere und die untere waagrechte Wand mit ersten Öffnungen (23, 24) versehen sind, die entlang der Drehachse für den Durchgang der axialen Stange angeordnet sind.
  6. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die ersten und zweiten Elemente (2") miteinander durch Kopplungseinrichtungen (29) gekoppelt sind, um gemäß einer im Wesentlichen waagrechten Achse (Z) zueinander schwenken und/oder gleiten zu können.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die ersten und zweiten Elemente (2") je eine senkrechte Wand, an der ein entsprechender Draht befestigt ist, und eine obere und eine untere waagrechte Wand aufweisen, die sich ausgehend von den Enden der senkrechten Wand erstrecken, wobei die Kopplungseinrichtungen an die Wände der ersten und zweiten Elemente angefügt sind.
  8. Vorrichtung nach Anspruch 5 oder 7, dadurch gekennzeichnet, dass das Erfassungsorgan ein druckempfindliches Erfassungskabel (6, 6") enthält, das die obere und untere waagrechte Wand der ersten und zweiten Elemente über zweite Öffnungen (25, 26) durchquert, die gemäß einer zweiten im Wesentlichen senkrechten Achse (Y) angeordnet sind, wobei die Abmessungen der zweiten Öffnungen im Wesentlichen gleich den Abmessungen des Querschnitts des Erfassungskabels sind.
  9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass sie außerdem mindestens einen Keil (260, 260") enthält, der in mindestens eine der zweiten Öffnungen (25, 26) der unteren und oberen waagrechten Wand der ersten und zweiten Elemente eingeführt werden kann.
  10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass sie zwei Keile (260, 260") aufweist, die in die zweite Öffnung zu beiden Seiten des Erfassungskabels gemäß der Verschieberichtung des Elements eingeführt werden können.
  11. Vorrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass jeder Keil eine Höhe größer als die Dicke der unteren oder oberen waagrechten Wand aufweist.
  12. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass jedes der ersten und zweiten Elemente mit einer Anfügeeinrichtung ausgestattet ist, um den entsprechenden Draht an der senkrechten Wand des Elements zu befestigen.
  13. Zaun, der nacheinander eine oder mehrere Lagen von Drähten enthält, dadurch gekennzeichnet, dass er mit einer Eindringerfassungsvorrichtung nach einem der Ansprüche 1 bis 11 ausgestattet ist.
EP12743699.6A 2011-07-18 2012-07-18 Vorrichtung zur eindringungserkennung Active EP2734986B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1156490A FR2978277B1 (fr) 2011-07-18 2011-07-18 Dispositif de detection d'intrusion
PCT/EP2012/064124 WO2013011074A1 (fr) 2011-07-18 2012-07-18 Dispositif de detection d'intrusion

Publications (2)

Publication Number Publication Date
EP2734986A1 EP2734986A1 (de) 2014-05-28
EP2734986B1 true EP2734986B1 (de) 2016-08-17

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EP12743699.6A Active EP2734986B1 (de) 2011-07-18 2012-07-18 Vorrichtung zur eindringungserkennung

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EP (1) EP2734986B1 (de)
FR (1) FR2978277B1 (de)
WO (1) WO2013011074A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109287501A (zh) * 2018-09-28 2019-02-01 侯马高知新生物科技有限公司 一种可调式草原畜牧用围栏
CN110164068B (zh) * 2019-06-06 2024-04-26 南京派光智慧感知信息技术有限公司 一种应力探测护栏

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL42470A (en) * 1973-06-11 1976-01-30 Israel Aircraft Ind Ltd A circuit breaker that responds to sudden movements
IL69945A (en) * 1983-10-10 1987-12-20 Israel Aircraft Ind Ltd Taut wire fence system and sensor therefor
US5852402A (en) * 1997-10-28 1998-12-22 Safeguards Technology, Inc. Intrusion detection system
FR2820865B1 (fr) 2001-02-09 2003-04-18 Serpe Iesm Soc D Etudes Et De Dispositif detecteur d'intrusion pour cloture

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FR2978277B1 (fr) 2016-12-23
EP2734986A1 (de) 2014-05-28
WO2013011074A1 (fr) 2013-01-24
FR2978277A1 (fr) 2013-01-25

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