EP0408595B1 - Hertzian-wave intrusion detector - Google Patents
Hertzian-wave intrusion detector Download PDFInfo
- Publication number
- EP0408595B1 EP0408595B1 EP89903178A EP89903178A EP0408595B1 EP 0408595 B1 EP0408595 B1 EP 0408595B1 EP 89903178 A EP89903178 A EP 89903178A EP 89903178 A EP89903178 A EP 89903178A EP 0408595 B1 EP0408595 B1 EP 0408595B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- antenna
- transmitter
- conducting body
- reception
- 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
Links
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 230000011664 signaling Effects 0.000 claims abstract description 4
- 230000003321 amplification Effects 0.000 claims abstract 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract 2
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000035945 sensitivity Effects 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 238000013459 approach Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 244000045947 parasite Species 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000007781 signaling event Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
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
Definitions
- the existing devices currently for detecting a presence, a movement in a volume are only active if the event does not freeze.
- a system is already known for detecting moving objects in a monitored area, by microwave diffraction (French patent application 2,290,714 ), however, with this system, it is only possible to detect moving objects. It uses a 10 GHZ microwave oscillator and not a pulse generator; the signal is modulated in microwaves and is transmitted by an antenna of the horn type which allows a directional emission with a minimum of loss; consequently, the protected volume is a function of the opening angle of the antenna. If the object to be detected is located outside the antenna scanning lobe, or behind it, it is not detected. In addition, the alarm is triggered when the object enters the detection field and, if it stops in it, the alarm stops and does not resume until the object moves again; if it moves very slowly, it is not detected.
- the object of the present invention is to remedy these drawbacks.
- This invention as characterized in the claims, solves the problem of creating a detection device with which it is possible to detect a mobile or stationary element in a predetermined volume.
- the present invention has the advantage of being able to act in a predetermined volume and the fact that the target is stationary or mobile does not intervene in the detection mode.
- the detection distance can be adjusted as required from a few millimeters to several meters.
- the element to be detected may be near the transmitting antenna or between the antennas.
- the radiation caused by the body sufficiently conductive of Hertzian energy 28 plays a very important role depending on its position between the antennas; in fact, the closer the conducting body is to the transmitting antenna 2, the greater the energy radiated to the receiving antenna 11.
- This effect will be cleverly used to determine the approximate distance from the conductive body 28 of the reception antenna 11; moreover, the immobility of the conductive body 28 is of no importance in the detection mode.
- the absence of the same conductive body can also be reported.
- the device cited as an example is in no way limiting, but on the contrary encompasses all variants.
- the transmitter consists of a pulse generator working in a frequency range ranging from a few tenths of Hertz to several Megahertz.
- a signal 4 from the transmitter 1 synchronizes the receiver so that during the idle time of no emission from the antenna 2 the receiver 13 is blocked.
- modulation 7 in the transmission signal and in the case of very noisy places or requiring special security a coding signal 5 is desirable.
- the transmission signal 10 from the pulse generator 6 and from the modulator 7 is amplified 9 so as to be directed towards the transmission antenna 2.
- the receiver 13 is quite simply an amplifier 14 which directly receives the synchronization signal 4 coming from the transmitter 1 and if there is the coding signal 5.
- the signal 3 emitted by the antenna 2 is received via airspace on antenna 11.
- Two cases can arise: First case: In the absence of the conductive body 28, the signal collected on the receiver 13 is intended to be insufficient so as not to exceed the predetermined signaling threshold. Introducing a sufficiently conductive body 28 between the antennas 2 and 11 is sufficient to cause the receiver to react, which then activates the means 12 and 15 of command and signaling actions. Furthermore, the detection distance can be adjusted at will by acting on the transmission power 9 or more simply on the sensitivity 18 of the receiver 13.
- Second case It should be noted that when the sensitivity of the receiver is judiciously adjusted to its triggering threshold without conductive presence between the antennas 2 and 11 the fact of placing between these two antennas a sufficiently conductive body 28 has the effect of creating a certain attenuation of the signal received on the antenna 11 therefore reacting the action means 12 and signaling 15 chosen.
- the combination of the two cases described allows a multitude of applications, a transmitter being able to serve one or more receivers regulated differently to follow for example the evolution of an intruder in a room until the moment when he will try to take, or be very close to an object to protect. It is also possible with the aid of a single receiver to follow the path of the conductive body when the latter approaches or moves away from the receiving antenna 11.
- the transmitting antenna 2 will evolve: having only a small area of radiation to monitor a specific location, it may go as far as covering the area of the volume to be monitored. to follow for example the evolution of the conductive object 28 in the space to be checked.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
- Radar Systems Or Details Thereof (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
Les dispositifs existants actuellement pour détecter une présence, un mouvement dans un volume, ne sont actifs que si l'événement ne se fige pas. On connaît déjà un système pour la détection d'objets mobiles dans une aire surveillée, par une diffraction de micro-ondes (demande de brevet français 2.290714), toutefois, avec ce système, il n'est possible que de détecter des objets mobiles. Il met en oeuvre un oscillateur de micro-ondes de 10 GHZ et non pas un générateur d'impulsions; le signal est modulé en micro-ondes et est transmis par une antenne du type cornet qui permet une émission directionnelle avec un minimum de perte ; en conséquence, le volume protégé est fonction de l'angle d'ouverture de l'antenne. Si l'objet à détecter est situé en dehors du lobe de balayage de l'antenne, où derrière celle-ci, il n'est pas détecté. De plus, l'alarme se déclenche lorsque l'objet entre dans le champ de détection et, s'il s'immobilise dans celui-ci, l'alarme s'arrête et ne reprend que si l'objet se déplace à nouveau ; s'il se déplace très lentement, il n'est pas détecté.The existing devices currently for detecting a presence, a movement in a volume, are only active if the event does not freeze. A system is already known for detecting moving objects in a monitored area, by microwave diffraction (French patent application 2,290,714 ), however, with this system, it is only possible to detect moving objects. It uses a 10 GHZ microwave oscillator and not a pulse generator; the signal is modulated in microwaves and is transmitted by an antenna of the horn type which allows a directional emission with a minimum of loss; consequently, the protected volume is a function of the opening angle of the antenna. If the object to be detected is located outside the antenna scanning lobe, or behind it, it is not detected. In addition, the alarm is triggered when the object enters the detection field and, if it stops in it, the alarm stops and does not resume until the object moves again; if it moves very slowly, it is not detected.
La présente invention a pour but de remédier à ces inconvénients. Cette invention, telle qu'elle est caractérisée dans les revendications, résout le problème consistant à créer un dispositif de détection avec lequel il soit possible de détecter un élément mobile ou immobile dans un volume prédéterminé.The object of the present invention is to remedy these drawbacks. This invention, as characterized in the claims, solves the problem of creating a detection device with which it is possible to detect a mobile or stationary element in a predetermined volume.
La présente invention a pour avantage de pouvoir agir dans un volume prédéterminé et le fait que la cible soit immobile ou mobile n'intervient pas dans le mode de détection. Entre autre avantage, la distance de détection peut être réglée suivant les besoins de quelques millimètres à plusieurs mètres.The present invention has the advantage of being able to act in a predetermined volume and the fact that the target is stationary or mobile does not intervene in the detection mode. Among other advantages, the detection distance can be adjusted as required from a few millimeters to several meters.
En fonction du mode choisi l'élément à détecter peut être à proximité de l'antenne d'émission ou entre les antennes. Le rayonnement provoqué par le corps suffisamment conducteur de l'énergie Hertzienne 28 joue un rôle très important en fonction de sa position entre les antennes; en effet, plus le corps conducteur sera très proche de l'antenne d'émission 2, plus l'énergie rayonnée vers l'antenne de réception 11 sera importante. Cet effet sera astucieusement utilisé pour déterminer la distaace aproximative du corps conducteur 28 de l'antenne de réception 11; de plus l'immobilité du corps conducteur 28 est sans importance dans le mode de détection. L'absence du même corps conducteur peut également être signalée. Le dispositif cité en exemple n'est nullement limitatif mais au contraire englobe toutes les variantes.Depending on the mode chosen, the element to be detected may be near the transmitting antenna or between the antennas. The radiation caused by the body sufficiently conductive of
Les possibilités de la présente invention sont telles que seule intervient la limite de l'imagination dans ses modes d'utilisation.The possibilities of the present invention are such that only the limit of the imagination intervenes in its modes of use.
L'invention sera mieux comprise grâce aux descriptions ci-après.The invention will be better understood thanks to the descriptions below.
Sur la figure 1 l'émetteur est constitué par un générateur d'impulsions travaillant dans une gamme de fréquences oscillant de quelques dizièmes de Hertz à plusieurs Mégahertz. Afin de diminuer les risques de déclenchements intempestifs par d'éventuels parasites, un signal 4 issu de l'émetteur 1 synchronise le récepteur afin que durant le temps mort de non émission de l'antenne 2 le récepteur 13 soit bloqué.Il est préféré une modulation 7 dans le signal d'émission et dans le cas de lieux très parasités ou demandant une sécurité particulière un signal de codage 5 est souhaitable.In Figure 1 the transmitter consists of a pulse generator working in a frequency range ranging from a few tenths of Hertz to several Megahertz. In order to reduce the risks of nuisance tripping by possible parasites, a signal 4 from the transmitter 1 synchronizes the receiver so that during the idle time of no emission from the antenna 2 the
Le signal d'émission 10 issu du générateur d'impulsions 6 et du modulateur 7 est amplifié 9 pour être dirigé vers l'antenne d'émission 2.The transmission signal 10 from the
Dans le cas présent le récepteur 13 est tout simplement un amplificateur 14 lequel reçoit directement le signal de synchronisation 4 issu de l'émetteur 1 et s'il existe le signal de codage 5. D'autre part,le signal 3 émis par l'antenne 2 est reçu via l'espace aérien sur l'antenne 11.In the present case the
Deux cas peuvent se présenter:
Premier cas: En l'absence du corps conducteur 28 le signal recueilli sur le récepteur 13 est voulu insuffisant afin de ne pas dépasser le seuil prédéterminé de signalisation.
Le fait d'introduire un corps suffisamment conducteur 28 entre les antennes 2 et 11 suffit pour faire réagir le récepteur qui actionne alors les moyens 12 et 15 d'actions de commande et de signalisation. De plus la distance de détection peut être réglée à volonté en agissant sur la puissance d'émission 9 ou plus simplement sur la sensibilité 18 du récepteur 13.
Deuxième cas: Il est à remarquer que lorsque la sensibilité du récepteur est judicieusement réglée à son seuil de déclenchement sans présence conductrice entre les antennes 2 et 11 le fait de placer entre ces deux antennes un corps suffisamment conducteur 28 a pour effet de créer une certaine atténuation du signal reçu sur l'antenne 11 donc de faire réagir les moyens d'action 12 et de signalisation 15 choisis. La combinaison des deux cas décrits permet une foule d'applications, un émetteur pouvant désservir un ou plusieurs récepteurs réglés différemment pour suivre par exemple l'évolution d'un intrus dans une pièce jusqu'au moment où il va tenter de prendre, ou être très proche d'un objet à protéger.
Il est également possible a l'aide d'un seul récepteur de suivre le parcours du corps conducteur lorque celui-ci se rapproche ou s'éloigne de l'antenne réceptrice 11. En effet, plus le corps conducteur 28 se rapproche de l'antenne 11, plus le signal 3 reçu est important; il suffit donc sur le récepteur 13 de faire réagir un détecteur de niveau 19 qui indique l'ampleur du signal reçu sur l'antenne 11.
Il est évident qu'en fonction du mode de détection choisi, l'antenne d'émission 2 évoluera : ne présentant qu'une faible surface de rayonnement pour surveiller un endroit précis elle pourra aller jusqu'à recouvrir l'aire du volume à surveiller pour suivre par exemple l'évolution de l'objet conducteur 28 dans l'espace à contrôler.Two cases can arise:
First case: In the absence of the
Introducing a sufficiently
Second case: It should be noted that when the sensitivity of the receiver is judiciously adjusted to its triggering threshold without conductive presence between the
It is also possible with the aid of a single receiver to follow the path of the conductive body when the latter approaches or moves away from the
It is obvious that according to the chosen detection mode, the transmitting antenna 2 will evolve: having only a small area of radiation to monitor a specific location, it may go as far as covering the area of the volume to be monitored. to follow for example the evolution of the
Claims (4)
- Electronic surveillance device allowing, within a predetermined volume, the detection and signalling of the presence or absence of a body which is a sufficiently strong conductor of Hertzian waves, with the possibility of monitoring its development within the space to be monitored, comprising a transmitter of modulated and if required coded Hertzian waves, a device for the reception and use of the different signals transmitted via or not via the conducting body, characterized in that the transmitter of Hertzian waves (1) comprises a pulse generator (6), the said pulses being directed towards an amplifier (9) which receives the modulation signal (7) and, if it exists, the coding signal (5), in that the modulated and optionally coded amplified signal (10) is directed towards the transmission antenna (2), in that the signal (3) radiated by the antenna (2) crosses the air space via the conducting body (28), which then behaves like an intermediate antenna (11) in order to reach the reception device (13), in that the reception device (13) is directly synchronized by a control signal (4) originating from the transmitter (1), allowing the reception device (13) to exploit the operating means (12, 15) after amplification (14) of the signal (3) received by the antenna (11), in that the detection distance of the conducting body (28) relative to the antenna (11) is obtained by adjusting the sensitivity threshold of the amplifier (14) and in that the information regarding the development of the conducting body (28) within the space to be monitored is obtained by means of a level detector (19) included in the reception device (13) allowing information regarding the closeness or distance of the conducting body (28) relative to the reception antenna (11) to be obtained by measuring the signal received by the antenna (11).
- Device according to claim 1, characterized in that the working frequency of the transmitter (1) is adjustable from a few tenths of a hertz to several megahertz.
- Device according to claim 1, characterized in that the power radiated by the antenna (2) is adjustable at will by the power amplifier (9).
- Device according to claim 1, characterized in that when the transmission must be coded, this coding is included in the control (4) and transmission (3) signal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8803201A FR2628556A1 (en) | 1988-03-11 | 1988-03-11 | DETECTION OF MODIFICATION OF A VOLUME BY A CONDUCTIVE BODY |
| FR8803201 | 1988-03-11 | ||
| PCT/FR1989/000093 WO1989008903A1 (en) | 1988-03-11 | 1989-03-08 | Hertzian-wave intrusion detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0408595A1 EP0408595A1 (en) | 1991-01-23 |
| EP0408595B1 true EP0408595B1 (en) | 1995-01-18 |
Family
ID=9364194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89903178A Expired - Lifetime EP0408595B1 (en) | 1988-03-11 | 1989-03-08 | Hertzian-wave intrusion detector |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0408595B1 (en) |
| AT (1) | ATE117448T1 (en) |
| DE (1) | DE68920736D1 (en) |
| FR (1) | FR2628556A1 (en) |
| WO (1) | WO1989008903A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NZ273549A (en) * | 1993-09-14 | 1996-12-20 | John Ferdinand Muehlebach | Movement detection; method and apparatus for detecting flying animals using microwave transmitted signal |
| RU2313830C1 (en) * | 2006-06-13 | 2007-12-27 | Российская Федерация в лице Федерального агентства по атомной энергии | Intruder alarm method, device for realization of said method and temperature indicator |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3863240A (en) * | 1972-12-08 | 1975-01-28 | Aerospace Res | Electromagnetic intrusion detection system |
| DK135353B (en) * | 1974-11-07 | 1977-04-12 | Schloeer Boerge | Plants for detecting moving objects within a monitored area by microwave diffraction. |
| DE2806448C2 (en) * | 1978-02-15 | 1985-01-10 | Brown, Boveri & Cie Ag, 6800 Mannheim | System for property security and personal protection by means of a microwave barrier |
| US4334214A (en) * | 1979-06-29 | 1982-06-08 | Yagi Antenna Co., Ltd. | Warning apparatus using microwaves |
| FR2578077A1 (en) * | 1985-02-27 | 1986-08-29 | Alsthom Cgee | Method and device for intrusion detection with UHF barrier |
| DE3525976A1 (en) * | 1985-07-20 | 1987-01-29 | Bbc Brown Boveri & Cie | Method for securing premises |
-
1988
- 1988-03-11 FR FR8803201A patent/FR2628556A1/en not_active Withdrawn
-
1989
- 1989-03-08 WO PCT/FR1989/000093 patent/WO1989008903A1/en not_active Ceased
- 1989-03-08 EP EP89903178A patent/EP0408595B1/en not_active Expired - Lifetime
- 1989-03-08 DE DE68920736T patent/DE68920736D1/en not_active Expired - Lifetime
- 1989-03-08 AT AT89903178T patent/ATE117448T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE68920736D1 (en) | 1995-03-02 |
| FR2628556A1 (en) | 1989-09-15 |
| WO1989008903A1 (en) | 1989-09-21 |
| ATE117448T1 (en) | 1995-02-15 |
| EP0408595A1 (en) | 1991-01-23 |
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