FR2930843A1 - Attempt of intrusion detecting system for detecting presence of unauthorized person near perimeter of fence at site, has transmission units transmitting data from detection units to remote station, where detection units are carried by posts - Google Patents

Abstract

The system has vibration and shock detection units (3) e.g. capacitive type accelerometer, for detecting vibration and shock produced on a fence. Transmission units (4, 5) transmit data issued from the detection units to a remote station. The detection units are carried by posts (1), on which panels (2) of the fence are fixed. The transmission units are connected to a data receiving unit. An autonomous supply unit supplies power to the detection units.

Description

Intrusion attempt detection system comprising means for detecting shocks and / or vibrations integrated into the posts of a fence, and device for mounting on fence posts. The field of the invention is that of the perimeter protection of sites.

More specifically, the invention relates to a fence system consisting in particular of the assembly of panels and poles, capable of detecting an intrusion attempt inside a perimeter delimited by the fence. In the field of the invention, several techniques are currently proposed to detect the unauthorized presence of people around a perimeter delimited by a fence, and / or to detect an intrusion attempt within this perimeter. Alarm systems using infrared sensors are particularly known: the principle of these systems lies in the deployment of a network of infrared beams delimiting a perimeter to be monitored, the fact that a person passes through this perimeter resulting in a temporary break infrared beam that triggers an alarm signal. Surveillance systems are also known that use a microwave technology, emitting waves in certain zones to be monitored, the presence of a person in a zone covered by the waves being of a nature to cause a disturbance thereof causing the issue of an alarm signal. According to these two systems, the aim is to detect the unauthorized presence of a person inside a site or in the vicinity of it. However, these systems are not intended to physically prevent a person from entering a specified perimeter. In other words, these systems are not intended to hinder an attempt to intrude. In practice, these systems are therefore used in a complementary manner to the implementation of a device physically delimiting a perimeter and forming an obstacle, such as a fence comprising panels (made of woven or welded wire, with single twisted metal wires, grids ...) fixed on poles. With regard to perimeter delineation equipment physically obstructing sites, such as fences, a technique for detecting an intrusion attempt inside the perimeter consists in implementing means for detecting vibrations and / or or shocks mounted on the fence panels. Such detection means may consist of accelerometers or a system commonly referred to as a shock cable including a pair of conductive wires provided to emit a signal in the event of vibrations and / or shocks on the panels of the cable. fenced. This technique thus makes it possible to detect the presence of a person who climbs on the fence panel to enter the perimeter, a signal being emitted if necessary to a remote station to alert a surveillance staff. However, this technique has a major disadvantage with respect to its violability. Indeed, for a malicious person warned, it is easy to detect the presence of shock cables and neutralize them. A quick way to neutralize the shock cables is then to cut them. It is no longer possible for the surveillance staff to detect an intrusion attempt. The invention particularly aims to overcome the disadvantages of the prior art. More specifically, the object of the invention is to propose a perimetric protection system for sites using panels fixed on posts which have a better degree of inviolability than that of the prior art.

In this sense, a particular object of the invention is to provide such a system which avoids, or at least considerably limits, the possibilities for a malicious person to access the detection means. The invention also aims to provide such a system which involves mounting operations of detection means that can be performed simply and quickly. Another object of the invention is to provide such a system that can be obtained by simple transformation operations of some existing fences.

These objectives, as well as others which will appear later, are achieved thanks to the invention which has for object an intrusion attempt detection system inside a perimeter delimited by a fence comprising fixed panels. on posts, of the type employing means for detecting shocks and / or vibrations that may occur on said fence, and means for transmitting data from said detection means to a remote station, characterized in that said means for detecting shocks and / or vibrations are carried by at least one of said posts. The invention thus proposes a completely new approach to the perimeter protection of sites, this by using the posts of the fence as supports for the means of detecting vibrations and / or shocks and no longer the panels fixed on the posts. The invention thus goes against a conventional reflex of the skilled person who considers that: the detection means must be placed on the panels, knowing that a malicious person tends rather to try to cross a fence climbing on it at the level of the panels; the panels are a priori a support having a degree of flexibility likely to effectively transmit the shocks and / or vibrations that are exerted on them As it will appear more clearly later, the fact of using the posts as support means vibration and / or shock detection makes it possible to house these inside the posts, so that these means for detecting vibrations and / or shocks are neither visible nor accessible by a malicious person. Consequently, an intrusion attempt detection system according to the invention has a better level of inviolability than the solutions of the prior art consisting of mounting means for detecting vibrations and / or shocks on the panels fixed on poles.

According to an advantageous solution, said vibration and / or shock detection means comprise at least one accelerometer. Such a component is particularly suitable for a system according to the invention, in that it can be in a relatively compact form for easy integration inside the posts of the fence.

According to a preferred embodiment, said data transmission means comprise means for transmitting said data by radiofrequency. This avoids the implementation of a wired link between the shock and / or vibration detection means and the remote station where the monitoring personnel is located. In other words, it limits the risk that a malicious person can access a cable vital to the operation of the system, even if this cable is hidden and / or difficult to access. Advantageously, said transmission means are associated with means for receiving data. It is thus possible for example to send a signal to the detection means so that they return a signal showing that the detection means are in working order.

In addition, these reception means can be used to remotely parameterize the detection means so that an alarm signal is generated only from a predetermined acceleration level. According to an advantageous solution, said one or more posts advantageously have at their upper end a shutter, said means for transmitting said data by radio frequency comprising an antenna integrated in said shutter. Such a characteristic makes it possible to manufacture the shutter with the radiofrequency antenna in a pre-assembled manner, which makes it possible to ensure the quality of the assembly (off-site to be protected) and to reduce the assembly time (on-site) . According to an advantageous embodiment, said detection means are housed in at least one of said posts. According to a first embodiment, said shock and / or vibration detection means are integrated on a card fixed in a recess of said post. According to a second embodiment, said shock and / or vibration detection means are integrated in a module fitted to the upper end of said post.

According to one conceivable variant, said data transmission means comprise a wired network, said wired network preferably being a carrier current network. Of course, other types of cable network can be envisaged and in particular an ethernet network, a bus mode ...

In this case, said wired network is preferably buried and joins said shock and / or vibration detection means extending inside said post. This limits the risks that a malicious person can access the cable network, for example to sever it to neutralize the system.

According to another characteristic of the invention, the system comprises autonomous supply means for said shock and / or vibration detection means. In this way, it avoids the implementation of power supply cables, which may constitute a fault of the protection system, insofar as such cables could be located by a malicious person to neutralize the system, by example by cutting these cables. In this case, said autonomous power supply means preferably comprise a photovoltaic panel mounted on said post. Note that the autonomous power supply means could also be constituted by one or more power supply batteries. Such batteries, however, should be replaced regularly, which would involve maintenance operations on each of the poles concerned.

The invention also relates to an intrusion attempts detection device comprising means for detecting shocks and / or vibrations, intended to be carried by a pole of a perimeter delimited by a fence comprising panels fixed on posts. Other objects and advantages relating to the invention will appear more clearly on reading the following description of several preferred embodiments of the invention, given by way of illustrative and nonlimiting examples, and the appended drawings in which: Figure 1 is a schematic representation of a perimeter protection system according to the invention; Figure 2 is a perspective view of a first embodiment according to the invention; Figure 3 is a perspective view of a second embodiment according to the invention; FIG. 4 is a representation in synoptic form of a perimeter protection system according to the invention. As indicated above, the principle of the invention lies in the fact of proposing an intrusion attempt detection system inside a perimeter delimited by a fence, in which shock detection means and / or vibrations are integrated into one or more posts of the fence.

This general principle is illustrated by FIG. 1. As illustrated by this FIG. 1, an intrusion attempt detection system inside a perimeter according to the invention comprises: a plurality of posts 1; a plurality of panels 2 (constituting a flat or substantially planar surface), each extending between two of the posts 1 and being fixed thereto (the same panel being capable of being coupled to more than two posts); shock and / or vibration detection means 3 carried by one or more of the posts.

According to a first embodiment, the posts 1 concerned have an internal structure at least partially recessed, so as to provide a housing 10 for receiving means for detecting shocks and / or vibrations 3. The panels 2 may be different possible types (rigid or flexible), among which: welded panels; - woven wire panels; - welded metal wire panels; - metal wire panels said to single twist; 25 to mesh panels;

According to an advantageous solution, the shock and / or vibration detection means 3 comprise an accelerometer. Such an accelerometer is preferably of the capacitive type.

In addition, the system according to the invention comprises data transmission means from the shock and / or vibration detection means 3, in the direction of a remote PC control station. These transmission means may be associated with data receiving means enabling the remote station to communicate bidirectionally with the detection means. According to a first approach of the invention, these data transmission means, connected to the shock and / or vibration detection means 3, comprise radiofrequency communication means 4 (the PC station 10 being of course equipped with means of communication). radio frequency reception adapted to the transmitting means). According to another enviisageable approach, the data transmission means comprise a wired network 5, connected to the shock and / or vibration detection means 3, extending to the PC control station. According to this approach, the wired network is preferably a carrier current network. In addition, the cable or cables of the wired network preferably extend from the shock and / or vibration detection means inside the pole concerned, over the entire height thereof, to reach the ground wherein they are buried at least partially (so as to extend within the protected perimeter for a distance rendering them inaccessible to a person outside the perimeter), the network joining the remote control station. It is also conceivable that the cable or cables extend over the entire height of the pole and emerge at the base (or in the vicinity of this base) of these being protected from any attempt to neutralize the outside, this by carting and / or by forming an obstacle at ground level, post and / or panels. This variant is illustrated in Figure 1, by the implementation of at least one plate 50 behind which the cable network 5 extends. Of course, the cable extends inside the perimeter to be protected with respect to the plate 50.

With reference to FIG. 2, a first embodiment of the invention is described. As shown in this figure, the post 1 is made from a metal sheet shaped by folding (for example by a profiling method), and has a hollow body 11 and attachment means 111 on which panels 2 (in this case welded metal wire panels) are intended to be fixed. The interior of the hollow body 11 of the post 1 constitutes a housing 10 in which means for detecting shocks and / or vibrations are mounted according to the principle of the invention. According to the present embodiment, the means for detecting shocks and / or vibrations are integrated in an electronic card 30 fixed to a wall 110 of the hollow body 11 of the post 1. It is noted that the electronic card 30, and consequently the accelerometer integrated thereto, is mounted in the vicinity of the upper end of the post 1. Thus, the accelerometer is mounted in an area of the post in which it is likely to present movements of sufficient amplitude to allow the detection of shocks and / or vibrations on the post (this as opposed to an area near the base of the post, the latter being generally sealed in the ground, and the base of the post thereby constituting a support perfectly static, or almost, so that shocks and / or vibrations on the pole are virtually undetectable at the base thereof). According to this embodiment, the upper end of the hollow body 11 of the post 1 is closed by means of a shutter 12 intended to be fitted on the post 1 (the shutter 12 penetrating the housing 10, as well as the means fastening 111). Note that the detection means can be integrated in the shutter according to a possible variant.

Preferably, the embodiment illustrated in FIG. 2 is part of the approach of the invention according to which the data transmission means comprise radiofrequency transmission means. These communication means comprise radiofrequency components integrated on the electronic card 30. In addition, these transmission means comprise a transmitting antenna 40. As illustrated by FIG. 2, this antenna 40 is integrated with the shutter 12 described. previously. The antenna may be, according to other possible embodiments, be embedded in the material of the shutter or be fixed in the shutter. Furthermore, a photovoltaic panel 6, of suitable size and capacity, provides the power supply independently of the shock and / or vibration detection means. The electronic card 30 also carries in this case also components necessary for the treatment and storage of the electrical energy produced by the photovoltaic panel 6. It is noted that an intrusion attempt detection system according to the invention can be obtained by evolving an existing fence (preferably comprising posts already having a recess for forming a housing for the shock and / or vibration detection means).

In this case, one solution is to provide a ready-to-assemble set comprising shock and / or vibration detection means associated with a support adapted to be fixed inside the recess of the posts. Such a kit (assembly ready to mount) may also include: - the data transmission means from the shock and / or vibration detection means; a specific shutter, for example integrating a transmitting antenna; - a photovoltaic panel. Figure 3 illustrates a second embodiment of the invention.

As illustrated by this figure, the means for detecting shocks and / or vibrations are integrated in an electronic card 30 fixed inside a sleeve 7 intended to be attached to the upper end of a pole 1 (forming a sort of shutter post), preferably by fitting (for example on the hollow body and the attachment means of a pole such as that described above with reference to Figure 2). Note that in this case, the electronic card 30 can also incorporate components for the emission of light, the sleeve 7 then being made of a transparent or translucent material.

It is also noted that this sleeve 7 (including in particular the shock and / or vibration detection means) can be proposed in the form of an assembly ready to be mounted. The operating principle of a system according to the invention is now described with reference to FIG. 4.

According to the operating principle of a system according to the invention, when the fence is requested due to an intrusion attempt, the shock and / or vibration detection means integrated into the pole 1 detect (or capture) vibration (or shocks) and emit a signal 100 via data transmission means 4, 5 (constituted either by radio frequency transmission means or by a wired network) to a remote control station PC. This PC comprises signal processing means 100 (so as to distinguish signals representative of an attempted intrusion from those that can be generated by bad weather, the presence of small animals ...). This signal processing causes, or not, the issuance of an alert signal so as to alert the surveillance personnel.

Claims (14)

REVENDICATIONS1. Intrusion attempt detection system within a perimeter delimited by a fence comprising panels fixed on posts, of the type implementing means for detecting shocks and / or vibrations that may occur on said closure, and means for transmitting data from said detection means to a remote station, characterized in that said means for detecting shocks and / or vibrations are carried by at least one of said posts. 2. System according to claim 1, characterized in that said means for detecting shocks and / or vibrations comprise at least one accelerometer. 3. System according to one of claims 1 and 2, characterized in that said data transmission means comprise means for transmitting said data by radio frequency. 4. System according to any one of claims 1 to 3, characterized in that said transmission means are associated with means for receiving data. 5. System according to claim 3 or claim 4, characterized in that said one or more posts have at their upper end a shutter, said means for transmitting and / or receiving said data by radio frequency comprising an antenna integrated in said shutter. 6. System according to any one of claims 1 to 5, characterized in that said detection means are housed in at least one of said posts. 7. System according to any one of claims 1 to 6, characterized in that said shock and / or vibration detection means are integrated on a card fixed in a recess of said post. 8. System according to any one of claims 1 to 5, characterized in that said means for detecting shock and / or vibration are integrated in a module fitted to the upper end of said pole. 9. System according to one of claims 1 and 2, characterized in that saidmeans of data transmission comprise a wired network. 10. System according to claim 9, characterized in that said cable network is a carrier current network. 11. System according to one of claims 9 and 10, characterized in that said wired network is buried and joins said shock and / or vibration detection means extending inside said post. 12. System according to any one of claims 1 to 11, characterized in that it comprises autonomous supply means for said shock and / or vibration detection means. 13. System according to claim 12, characterized in that said autonomous supply means comprise a photovoltaic panel mounted on said post. 14. intrusion attempt detection device comprising means for detecting shocks and / or vibrations, intended to be carried by a post of a perimeter delimited by a fence comprising panels fixed on posts.