FR2688597A1 - Device, with H.F. transmission and reception antennas, capable of detecting a (L.C.) trap (block) circuit along a horizontal path - Google Patents
Device, with H.F. transmission and reception antennas, capable of detecting a (L.C.) trap (block) circuit along a horizontal path Download PDFInfo
- Publication number
- FR2688597A1 FR2688597A1 FR9202881A FR9202881A FR2688597A1 FR 2688597 A1 FR2688597 A1 FR 2688597A1 FR 9202881 A FR9202881 A FR 9202881A FR 9202881 A FR9202881 A FR 9202881A FR 2688597 A1 FR2688597 A1 FR 2688597A1
- Authority
- FR
- France
- Prior art keywords
- antennas
- detecting
- receiving
- circuit
- antenna
- 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.)
- Withdrawn
Links
- 230000005540 biological transmission Effects 0.000 title abstract description 3
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 125000006850 spacer group Chemical group 0.000 claims description 17
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
- G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
- G08B13/2468—Antenna in system and the related signal processing
- G08B13/2474—Antenna or antenna activator geometry, arrangement or layout
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
- G01V3/104—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils
- G01V3/105—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils forming directly coupled primary and secondary coils or loops
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Computer Security & Cryptography (AREA)
- Automation & Control Theory (AREA)
- Signal Processing (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
DISPOSITIF D'ANTENNES D'EMISSION ET DE RECEPTION H.F. CAPABLE DE
DETECTER UTN CIRCUIT BoUCHON (LC) SUIVANT UN PARCOURS HORIZONTAL.HF TRANSMISSION AND RECEPTION ANTENNA DEVICE CAPABLE OF
DETECT UTN BOUCHON CIRCUIT (LC) FOLLOWING A HORIZONTAL ROUTE.
La présente invention concerne un dispositf d'antennes d'émission et de réception H.F. capable de détecter un circuit bouchon lorsque celui-ci passe entre les antennes. le nombre minimum d'antennes est de deux : une antenne émettrice et une antenne réceptrice. On connait déja des dispositifs de ce genre. L'une des application possible de tels dispositifs concerne la lutte contre le vol dans les magasins. Dans cette application, le circuit bouchon est généralement un bobinage plat en cuivre relié a un condensateur. The present invention relates to a device for H.F. transmitting and receiving antennas capable of detecting a plug circuit when the latter passes between the antennas. the minimum number of antennas is two: a transmitting antenna and a receiving antenna. We already know devices of this kind. One of the possible applications of such devices relates to the fight against theft in stores. In this application, the plug circuit is generally a flat copper coil connected to a capacitor.
Dans de tels dispositifs, l'antenne émettrice est constituée d'un socle (1) et d'un tube métallique cintré (2) en forme d'arceau allongé. Dans ce dernier passe un cable électrique isolé (3) formant donc une boucle et que l'on appelle antenne virtuelle. l'arceau métallique est isolé électriquement de son socle par des manchons (4). La figure 1 représente l'antenne émettrice telle que décrite précédemment. In such devices, the transmitting antenna consists of a base (1) and a curved metal tube (2) in the form of an elongated arch. In the latter passes an insulated electrical cable (3) therefore forming a loop and which is called virtual antenna. the metal arch is electrically isolated from its base by sleeves (4). Figure 1 shows the transmitting antenna as described above.
L'antenne réceptrice est constituée d'un socle (6), d'un tube métallique en forme d'arceau (7) identique à celui de l'antenne émettrice et d'une, deux ou plusieures entretoises (8) également en métal. Dans cet ensemble passe le cable (9) formant l'antenne virtuelle. ce cable décrit respectivement deux ou trois boucles selon que l'antenne comporte une ou deux entretoises. Chaque élément de cet ensemble est isolé électriquement par des manchons (10) et des bagues (Il). La figure 2 représente les différentes antennes émettrices décrites précédemment. The receiving antenna consists of a base (6), a metal tube in the form of an arch (7) identical to that of the transmitting antenna and one, two or more spacers (8) also made of metal. . In this assembly passes the cable (9) forming the virtual antenna. this cable respectively describes two or three loops depending on whether the antenna has one or two spacers. Each element of this set is electrically insulated by sleeves (10) and rings (II). Figure 2 shows the different transmitting antennas described above.
Les extremités du cable électrique isolé formant l'antenne virtuelle emettrice sont connectés sur une carte électronique "metteur (5) qui génère , module et amplifie le signal émis. The ends of the insulated electrical cable forming the transmitting virtual antenna are connected to an electronic "transmitter" card (5) which generates, modulates and amplifies the signal transmitted.
Les extrémités du cable électrique isolé formant l'antenne virtuelle réceptrice sont connectés sur une carte électronique "récepteur" (12) qui reçoit, amplifie et analyse les signaux reçus. The ends of the insulated electrical cable forming the receiving virtual antenna are connected to an "receiving" electronic card (12) which receives, amplifies and analyzes the signals received.
Les deux antennes sont disposées face à face, selon la figure 3. The two antennas are arranged face to face, according to FIG. 3.
Les dispositifs de ce genre proposés jusquà présent ne donnent pas entière satisfaction et en particulier comportent des zones de non détection paralleles et donc parfois confondues au parcours que- V a: emprunté le circuit bouchon lorsqu'il va traverser le volume contenu entre les deux antennes. The devices of this kind proposed so far do not give complete satisfaction and in particular comprise parallel zones of non-detection and therefore sometimes confused with the path that V has: taken the plug circuit when it will cross the volume contained between the two antennas .
Ces zones de non détection sont dues a la présence des entretoises sur l'antenne receptrice. En effet, dans les entretoises, les cables électriques formant l'antenne virtuelle se croisent, ce qui provoque localement une annulation de l'effet de reception de l'antenne. La présence de ces entretoises et le croisement des cables de l'antenne virtuelle sont néanmoins indispensables : En effet, si l'antenne réceptrice était identique à l'antenne émettrice, le circuit bouchon, constitué d'un bobinnage plat, ne serait détecté lors de son passage entre les antennes que s'il se présente confondu dans un plan parallèle aux plans des deux antennes. These non-detection zones are due to the presence of the spacers on the receiving antenna. Indeed, in the spacers, the electric cables forming the virtual antenna cross, which locally causes a cancellation of the reception effect of the antenna. The presence of these spacers and the crossing of the cables of the virtual antenna are nevertheless essential: Indeed, if the receiving antenna was identical to the transmitting antenna, the plug circuit, consisting of a flat winding, would not be detected during of its passage between the antennas only if it coincides in a plane parallel to the planes of the two antennas.
La figure 4 représente les dispositifs dont l'antenne réceptrice (14) comporte une seule entretoise. Leur zone de non détection (15) se situe approximativement à mi-hauteur des antennes. Les zones de détection sont représentée sur la figure 4 en hachuré. Il n'est pas possible non plus de déplacer l'entretoise (13) le long de l'antenne, car le déséquilibre qui en résulterait diminuerait considérablement la sensibilité de détection du dispositif. FIG. 4 represents the devices, the receiving antenna (14) of which comprises a single spacer. Their non-detection zone (15) is located approximately halfway up the antennas. The detection zones are shown in Figure 4 in hatched form. It is also not possible to move the spacer (13) along the antenna, because the imbalance that would result would considerably reduce the detection sensitivity of the device.
La figure 5 représente les dispositifs dont l'antenne récepteur (16) comporte deux entretoises (17). Ils privilegient la détection à mithauteur des antennes au détriment des parties hautes et brasses qui comportent alors deux zones de non detection (18). Les zones de détection sont représentées sur la figure 5 par des hachures. FIG. 5 represents the devices whose receiving antenna (16) comprises two spacers (17). They favor the detection at half height of the antennas to the detriment of the high and fathom parts which then comprise two non-detection zones (18). The detection zones are represented in FIG. 5 by hatching.
En conclusion, de tels dispositifs, avec une , deux entretoises ou plus, sont peu fiable du fait que la détection qu'ils offrent reste tres alléatoire en fonction de la hauteur à laquelle le circuit bouchon va passer entre les antennes. In conclusion, such devices, with one, two or more spacers, are unreliable because the detection that they offer remains very random depending on the height at which the plug circuit will pass between the antennas.
Le but essentiel de l'invention est de réaliser un dispositif du genre défini précédemment, qui, malgré la présence d'une ou plusieurs entretoises sur l'antenne réceptrice permet à un circuit bouchon d'etre détecté obligatoirement, lorsqu'il suit un parcours horizontal entre les antennes. The essential object of the invention is to provide a device of the kind defined above, which, despite the presence of one or more spacers on the receiving antenna allows a plug circuit to be detected necessarily, when it follows a route horizontal between the antennas.
Un autre but de l'invention est de réaliser un dispositif simple et compatible avec ceux définis précédemment. Another object of the invention is to provide a simple device compatible with those defined above.
La présente invention concerne un dispositif d'antennes dont la ou les entretoises (19) sont inclinées au lieu d'etre horizontales. The present invention relates to an antenna device in which the spacer (s) (19) are inclined instead of being horizontal.
La figure 6 représente le dispositif selon l'invention vu de profil et met en évidence l'intéret de l'entretoise (19) inclinée. Figure 6 shows the device according to the invention seen in profile and highlights the interest of the inclined spacer (19).
Selon la caracteristique essentielle de l'invention, l'inclinaison de la ou des entretoises (19) provoque une rotation de la ou des zones de non détection 20 définies précédemment. En conséquence, le circuit bouchon suivant un parcours horizontal entre les antennes pénétrera forcément à un moment ou à un autre dans une zone de détection. Ces dernières sont représentées en hachuré sur la figure 6. According to the essential characteristic of the invention, the inclination of the spacer (s) (19) causes rotation of the non-detection zone (s) 20 defined above. Consequently, the plug circuit following a horizontal path between the antennas will necessarily penetrate at one time or another in a detection zone. These are shown hatched in Figure 6.
Selon une deuxième carractéristique de l'invention, la tète H.F. de la carte électronique réceptrice du dispositif d'antennes est modifiée. Cette modification, rendue necessaire pour réaccordée l'antenne réceptrice du fait de la nouvelle disposition de l'entretoise, porte sur le changement d la valeur des capacités de filtrage d'entrée du signal. According to a second characteristic of the invention, the head H.F. of the electronic card receiving the antenna device is modified. This modification, made necessary to retune the receiving antenna due to the new arrangement of the spacer, relates to the change in the value of the signal input filtering capacities.
Selon une troisième carractéristique de l'invention, la carte électronique réceptrice du dispositif d'antennes est munie d'un circuit intégré démodulateur large bande de type
I.F.A.M. carractérisé en ce qu'il dispose typiquement d'un circuit de correction automatique de gain. son role étant de rétablir le déséquilibre du à la nouvelle disposition des entretoises. According to a third characteristic of the invention, the receiving electronic card of the antenna device is provided with a broadband demodulator integrated circuit of the type
IFAM characterized in that it typically has an automatic gain correction circuit. its role is to restore the imbalance due to the new arrangement of the spacers.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9202881A FR2688597A1 (en) | 1992-03-11 | 1992-03-11 | Device, with H.F. transmission and reception antennas, capable of detecting a (L.C.) trap (block) circuit along a horizontal path |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9202881A FR2688597A1 (en) | 1992-03-11 | 1992-03-11 | Device, with H.F. transmission and reception antennas, capable of detecting a (L.C.) trap (block) circuit along a horizontal path |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2688597A1 true FR2688597A1 (en) | 1993-09-17 |
Family
ID=9427565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR9202881A Withdrawn FR2688597A1 (en) | 1992-03-11 | 1992-03-11 | Device, with H.F. transmission and reception antennas, capable of detecting a (L.C.) trap (block) circuit along a horizontal path |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2688597A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202012008852U1 (en) * | 2012-09-17 | 2013-12-18 | Checkpoint Systems, Inc. | antenna device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2550736A (en) * | 1949-07-15 | 1951-05-01 | Rca Corp | Metal detection apparatus |
| GB2075199A (en) * | 1980-04-29 | 1981-11-11 | Electrolocation Ltd | Detection system for concealed current carrying conductors |
| GB2224849A (en) * | 1988-11-01 | 1990-05-16 | Outokumpu Oy | Metal detector |
| EP0414628A2 (en) * | 1989-08-25 | 1991-02-27 | George W. Kaltner | Individually fed multiloop antennas for electronic security systems |
| EP0440370A1 (en) * | 1990-02-01 | 1991-08-07 | Checkpoint Systems, Inc. | Composite antenna for electronic article surveillance systems |
-
1992
- 1992-03-11 FR FR9202881A patent/FR2688597A1/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2550736A (en) * | 1949-07-15 | 1951-05-01 | Rca Corp | Metal detection apparatus |
| GB2075199A (en) * | 1980-04-29 | 1981-11-11 | Electrolocation Ltd | Detection system for concealed current carrying conductors |
| GB2224849A (en) * | 1988-11-01 | 1990-05-16 | Outokumpu Oy | Metal detector |
| EP0414628A2 (en) * | 1989-08-25 | 1991-02-27 | George W. Kaltner | Individually fed multiloop antennas for electronic security systems |
| EP0440370A1 (en) * | 1990-02-01 | 1991-08-07 | Checkpoint Systems, Inc. | Composite antenna for electronic article surveillance systems |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202012008852U1 (en) * | 2012-09-17 | 2013-12-18 | Checkpoint Systems, Inc. | antenna device |
| US9461354B2 (en) | 2012-09-17 | 2016-10-04 | Checkpoint Systems, Inc. | Single piece antenna device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |