NO156349B - INSTALLATION FOR REGISTERING A PASSAGE OF A REMOVAL THROUGH A DETERMINED AREA. - Google Patents

INSTALLATION FOR REGISTERING A PASSAGE OF A REMOVAL THROUGH A DETERMINED AREA. Download PDF

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Publication number
NO156349B
NO156349B NO823180A NO823180A NO156349B NO 156349 B NO156349 B NO 156349B NO 823180 A NO823180 A NO 823180A NO 823180 A NO823180 A NO 823180A NO 156349 B NO156349 B NO 156349B
Authority
NO
Norway
Prior art keywords
period
signals
transmission
receiver
marker
Prior art date
Application number
NO823180A
Other languages
Norwegian (no)
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NO823180L (en
NO156349C (en
Inventor
Ariel Garcia Paladini
Bent Svendsen
Frede Nielsen
Original Assignee
Antonson Security As
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Antonson Security As filed Critical Antonson Security As
Publication of NO823180L publication Critical patent/NO823180L/en
Publication of NO156349B publication Critical patent/NO156349B/en
Publication of NO156349C publication Critical patent/NO156349C/en

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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
    • G08B13/2402—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
    • G08B13/2405—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 characterised by the tag technology used
    • G08B13/2414—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 characterised by the tag technology used using inductive tags
    • 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
    • G08B13/2471—Antenna signal processing by receiver or emitter
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Devices For Checking Fares Or Tickets At Control Points (AREA)
  • Container Filling Or Packaging Operations (AREA)
  • Geophysics And Detection Of Objects (AREA)

Description

Oppfinnelsen angår et anlegg for registrering av en passasje av en gjenstand gjennom et forutbestemt område, og er av den art som innbefatter en sender og en mottager med en felles antenne for vekslende utsendelse og mottagelse av elektromagnetiske signaler samt en til hver av gjenstandene fastgjort markør for mottagelse av de nevnte signaler og ut sendelse av andre signaler ved passasje av området, hos hvilken sende- og mottagerperioden skifter, idet de utsendte signaler har en konstant signalfrekvens i hele sendeperioden, og et analysekretsløp teller et gitt antall av i ubrudt rekkefølge mottatte signaler fra markøren, som utgjøres av en avstemt krets, og sammenligner frekvensen av disse med frekvensen til de av senderen i en sendeperiode^ utsendte signaler idet sender- og mottagerantennen har- form som en mangepol-sløyfe, fortrinnsvis i form som en åttetallsvridd dipol-sløyfe, som ligger i ett plan, idet det i anlegget inngår minst ett høypassfilter. The invention relates to a facility for recording the passage of an object through a predetermined area, and is of the type that includes a transmitter and a receiver with a common antenna for alternately sending and receiving electromagnetic signals as well as a marker attached to each of the objects for receiving the mentioned signals and sending out other signals when passing through the area, in which the sending and receiving period changes, since the sent signals have a constant signal frequency throughout the sending period, and an analysis circuit counts a given number of signals received in uninterrupted order from the marker, which is made up of a tuned circuit, and compares the frequency of these with the frequency of the signals emitted by the transmitter in a transmission period, the transmitter and receiver antenna having the form of a multipole loop, preferably in the form of a figure-of-eight twisted dipole loop, which lies in one plane, as the system includes at least one high-pass filter.

Et slikt anlegg er f.eks. kjent fra dansk patentsøknad Such a facility is e.g. known from Danish patent application

nr. 3511/78. En ulempe ved dette anlegget er at markøren ved visse orienteringer vil kunne passere uten at den blir detektert av hovedfeltet. No. 3511/78. A disadvantage of this system is that the marker will be able to pass through certain orientations without being detected by the main field.

Videre er det kjent fra US-patent nr. 3 828 377 et anlegg av den innledningsvis nevnte art hvor det inngår et radio-frekvensbåndpassfilter samt en signalbehandlingskrets omfat-tende en støybegrensende krets slik som båndpassfilteret for de mottatte signaler. Furthermore, it is known from US patent no. 3 828 377 a system of the type mentioned at the outset which includes a radio frequency bandpass filter and a signal processing circuit including a noise limiting circuit such as the bandpass filter for the received signals.

Anlegget ifølge foreliggende oppfinnelse er av den art som ovenfor nevnt og dets karakteristiske trekk fremgår av krav 1. The plant according to the present invention is of the kind mentioned above and its characteristic features appear from claim 1.

Ved en spesielt hensiktsmessig utførelsesform aktiveres kun alarmen i tilfelle av at forskjellen i mellom antallet bølge-topper i første periode og antallet bølgetopper i andre periode er tilstrekkelig'stort. Anlegget kan derved gjøres sa følsomt at også svake sidefester - som er av en annen orientering - vil kunne utnyttes. Markøren vil derved - uansett hvilken orientering den måtte ha - ikke kunne passere området uten å bli detektert. In a particularly suitable embodiment, the alarm is only activated in the event that the difference between the number of wave peaks in the first period and the number of wave peaks in the second period is sufficiently large. The facility can thereby be made so sensitive that even weak side mounts - which are of a different orientation - will be able to be utilized. The marker will therefore - regardless of its orientation - not be able to pass the area without being detected.

Videre er man uavhengig av antennens form og orientering. Furthermore, you are independent of the shape and orientation of the antenna.

Oppfinnelsen skal nærmere forklares i det følgende under henvisning til tegningene, hvor: Fig. 1 viser et diagram over et anlegg ifølge oppfinnelsen . The invention will be explained in more detail below with reference to the drawings, where: Fig. 1 shows a diagram of a plant according to the invention.

Fig. 2 viser hvorledes anlegget anvendes. Fig. 2 shows how the facility is used.

Fig. 3 viser en annen anvendelsesmulighet med angivelse Fig. 3 shows another possible application with indication

av antennens oppbygning. of the antenna structure.

Fig. 4 viser såvel de utsendte som de mottatte signaler. Fig. 4 shows both the transmitted and the received signals.

På fig. 1 er vist hvorledes antennen 1 er tilkoplet en sender 2 eller en mottager 3, 4 via en omkopler 5. Omkopleren styres av en synkroniseringsenhet 6 med en passende høy frekvens. Ved utsendelsen av et kortvarig signal fra senderen 2 med en frekvens på eksempelvis 1 MHz induseres det en vek-selstrøm i en svingekretsi en markør 18 (se fig. 2) hvis denne befinner seg innenfor det av senderantennen dannede elektromagnetiske felt. Ved opphør av denne signalutsendelsen, dvs. når antennen 1 ved hjelp av omkopleren 5 tilsluttes mottageren 3, 4, utsender markørens 18 svingkrets et signal med samme frekvens inntil svingningene dør ut. Dette signalet mottas av antennen 1 og sendes via mottageren 3, 4 videre til en signalbehandlingskrets 7. Denne kretsen 7 får samtidig pulser fra synkroniseringsenheten 6, hvorved denne er i stand til å telle hvor mange signaler som mottas fra en markør 18 i ubrutt rekkefølge. Dette kan tilveiebringes ved at den respektive telleren nullstilles, hvis det ikke mottas et signal i mottagerperioden umiddelbart etter en sendeperiode. Signalbehandlingskretsen 7 kontrollerer videre om de mottatte signaler har samme frekwens som de utsendte. Dette gir en ytterligere sikkerhet mot falsk alarm. In fig. 1 shows how the antenna 1 is connected to a transmitter 2 or a receiver 3, 4 via a switch 5. The switch is controlled by a synchronization unit 6 with a suitably high frequency. When sending a short-term signal from the transmitter 2 with a frequency of, for example, 1 MHz, an alternating current is induced in a swing circuit of a marker 18 (see fig. 2) if this is located within the electromagnetic field formed by the transmitter antenna. When this signal transmission ceases, i.e. when the antenna 1 is connected to the receiver 3, 4 by means of the switch 5, the oscillating circuit of the marker 18 emits a signal with the same frequency until the oscillations die out. This signal is received by the antenna 1 and sent via the receiver 3, 4 on to a signal processing circuit 7. This circuit 7 simultaneously receives pulses from the synchronization unit 6, whereby it is able to count how many signals are received from a marker 18 in an unbroken sequence. This can be provided by the respective counter being reset to zero, if no signal is received in the receiver period immediately after a transmission period. The signal processing circuit 7 further checks whether the received signals have the same frequency as the transmitted ones. This provides additional security against false alarms.

På fig. 2 er vist hvorledes et antall åttetalslignende an-tenner 8 kan anbringes slik at en bred passasje kan kontrol-leres. Anlegget er innebygd i et rammestativ. Selve de åttetalsformede antennene er rammedelene 9, 10, 11, 12, 13, 14, 15 og 16, mens senderen 2, mottageren 3,4 og styreen-heten 7 er innebygd i en kasse 17. In fig. 2 shows how a number of figure-of-eight antennas 8 can be placed so that a wide passage can be controlled. The device is built into a frame rack. The figure-of-eight antennas themselves are the frame parts 9, 10, 11, 12, 13, 14, 15 and 16, while the transmitter 2, the receiver 3,4 and the control unit 7 are built into a box 17.

De åttetalslignende antennene - som fortrinnsvis ligger i ett plan - genererer et toroidformet felt (som for tydelighetens skyld kun er vist ved en av antennene), som innenfor en viss rekkevidde vil bevirke at en markør vil kunne bli detektert ved passasje av en markør nesten uavhengig av dens orientering . The figure-of-eight-like antennas - which preferably lie in one plane - generate a toroid-shaped field (which, for the sake of clarity, is only shown at one of the antennas), which within a certain range will cause a marker to be detected by the passage of a marker almost independently of its orientation.

Ifølge oppfinnelsen er det imidlertid anvist hvorledes man også vil kunne utnytte de svakere sidefelter (som for tydelighetens skyld kun er vist ved en av antennene), slik at markøren heller ikke vil kunne passere når en markør er parallell med hovedfeltets retning (to retninger). Dette er ifølge oppfinnelsen tilveiebrakt ved at man først har en sendeperiode på f.eks. 60/isek. og deretter en første mottagerperiode på 20 usek. I denne perioden teller man da antallet topper og hvis sendefrekvensen er 1 MHz skulle dette tilsvare ca. 20 topper eller perioder (eller mer, hvis der også er et støysignal). Deretter kommer en blank periode på f.eks. 40 psek. og deretter en annen mottagelsesperiode - se fig. 4 - i hvilken antallet topper telles. Telles et forutbestemt antall topper i en mottagerperiode avgis et signal. Telles nå et annet forutbestemt antall signaler i ubrutt rekkefølge fra første mottagerperiode, samtidig med at antallet signaler fra en annen mottagerperiode ikke over-stiger et forutbestemt antall aktiveres alarmen. Systemet blir derved så følsomt at også de svakere sidefeltene vil kunne utnyttes. Sidefeltene vil derved også kunne detektere markøren 18 i tilfelle av at den ikke detekteres av hovedfeltet, idet man utnytter at sidefeltene har en annen orientering enn hovedfeltet, jfr. fig. 2. According to the invention, however, it is indicated how one will also be able to utilize the weaker side fields (which, for the sake of clarity, are only shown at one of the antennas), so that the marker will also not be able to pass when a marker is parallel to the direction of the main field (two directions). According to the invention, this is achieved by first having a transmission period of e.g. 60/sec. and then a first receiver period of 20 usek. During this period, the number of peaks is counted and if the transmission frequency is 1 MHz, this should correspond to approx. 20 peaks or periods (or more, if there is also a noise signal). Then comes a blank period of e.g. 40 psec. and then another reception period - see fig. 4 - in which the number of peaks is counted. If a predetermined number of peaks are counted in a receiver period, a signal is emitted. If another predetermined number of signals is now counted in unbroken order from the first receiver period, while the number of signals from another receiver period does not exceed a predetermined number, the alarm is activated. The system thereby becomes so sensitive that even the weaker side fields can be utilized. The side fields will thereby also be able to detect the marker 18 in the event that it is not detected by the main field, taking advantage of the fact that the side fields have a different orientation than the main field, cf. fig. 2.

En ytterligere fordel ved anlegget ifølge oppfinnelsen er at man blir uavhengig av antennes form og plassering. Det er også mulig å anvende en mangepolet antenne. I alle tilfelle er det imidlertid en fordel å utforme antennen på en slik måte at utenfra kommende fjernfelter utkompenserer seg selv, f.eks. ved at løkkene har samme areal. A further advantage of the system according to the invention is that you become independent of the shape and location of the antenna. It is also possible to use a multipole antenna. In all cases, however, it is an advantage to design the antenna in such a way that distant fields coming from outside compensate for themselves, e.g. in that the loops have the same area.

Anlegget er dessuten fordelaktig ved at det ikke er følsomt overfor rystelser og at det er lett å sette opp. The facility is also advantageous in that it is not sensitive to vibrations and that it is easy to set up.

Markøren utgjøres fortrinnsvis av en spole i forbindelse med en kondensator, idet spolen virker som mottager- og sender-antenne for markøren. Q-veriden er fortrinnsvis større enn 50. The marker preferably consists of a coil in connection with a capacitor, as the coil acts as receiver and transmitter antenna for the marker. The Q-value is preferably greater than 50.

Anlegget ifølge oppfinnelsen vil kunne varieres på mange måter uten at det derved avviker fra oppfinnelsens ide. The plant according to the invention can be varied in many ways without thereby deviating from the idea of the invention.

Claims (2)

1. Anlegg for registrering av en passasje av en gjenstand gjennom et forutbestemt område av den art som omfatter en sender og en mottager med en felles antenne (1) for vekselvis utsendelse og mottagelse av elektromagnetiske signaler samt en til hver av gjenstandene fastgjort markør (18) for mottagelse av de nevnte signaler og utsendelse av andre signaler ved passasje av området, ved hvilken sende- og mottagerperioden skifter, idet de utsendte signaler har en konstant signalfrekvens i hele sendeperloden, og en analyse-krets (7) teller et gitt antall av i ubrutt rekkefølge mottatte signaler fra markøren (18), som utgjøres av en avstemt krets og sammenligner frekvensen av disse med frekvensen til de av senderen i en sendeperiode utsendte signaler, idet sende- og mottagerantennen (1) har form av en mangepolet sløyfe, fortrinnsvis i form av en åttetallsvridd dipolsløyfe, som ligger i ett plan, idet det i anlegget inngår minst ett høypassfilter,karakterisertved at høypassfilteret utgjøres av et digitalt høypass-filter som aktiveres i det minste i to på hverandre følgende perioder etter signalutsendelsen, idet sendeperioden etter-følges av en første mottagerperiode, i hvilken analysekretsen teller antallet av signalfrekvens-bølgetopper (perioder) og minst en ytterligere mottagerperiode, i hvilken analysekretsen også teller antallet topper, idet analysekretsen kun aktiverer en alarm i tilfelle av at tellingen i første mottagerperiode er tilstrekkelig over en forutbestemt første tellerstand og tellingen i andre mottagerperiode ikke overskrider en forutbestemt andre tellerstand (fig. 4).1. Installation for recording a passage of an object through a predetermined area of the kind comprising a transmitter and a receiver with a common antenna (1) for alternately sending and receiving electromagnetic signals as well as a marker (18) attached to each of the objects for reception of the mentioned signals and transmission of other signals during passage of the area, during which the transmission and reception periods change, as the transmitted signals have a constant signal frequency throughout the transmission period, and an analysis circuit (7) counts a given number of unbroken sequence received signals from the marker (18), which is constituted by a tuned circuit and compares the frequency of these with the frequency of the signals emitted by the transmitter in a transmission period, the transmitting and receiving antenna (1) having the form of a multipole loop, preferably in the form of a figure-of-eight twisted dipole loop, which lies in one plane, as the system includes at least one high-pass filter, characterized in that the high-pass filter consists of a digital high-pass filter which is activated for at least two consecutive periods after the signal transmission, the transmission period being followed by a first receiving period, in which the analysis circuit counts the number of signal frequency wave peaks (periods) and at least one further receiving period, in which the analysis circuit also counts the number of peaks, as the analysis circuit only activates an alarm in the event that the count in the first receiver period is sufficient above a predetermined first counter value and the count in the second receiver period does not exceed a predetermined second counter value (fig. 4). 2. Anlegg ifølge krav 1,karakterisert vedat alarmen aktiveres kun i tilfelle av en forutbestemt forskjell i tellerstandene.2. Installation according to claim 1, characterized in that the alarm is activated only in the event of a predetermined difference in the meter readings.
NO823180A 1981-10-05 1982-09-20 INSTALLATION FOR REGISTRATION OF A PASSAGE OF AN OBJECT THROUGH A PRESERVED AREA. NO156349C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA000387303A CA1180788A (en) 1981-10-05 1981-10-05 System for registrating a passing article

Publications (3)

Publication Number Publication Date
NO823180L NO823180L (en) 1983-04-06
NO156349B true NO156349B (en) 1987-05-25
NO156349C NO156349C (en) 1987-09-02

Family

ID=4121088

Family Applications (1)

Application Number Title Priority Date Filing Date
NO823180A NO156349C (en) 1981-10-05 1982-09-20 INSTALLATION FOR REGISTRATION OF A PASSAGE OF AN OBJECT THROUGH A PRESERVED AREA.

Country Status (7)

Country Link
JP (1) JPS58121495A (en)
AU (1) AU535114B2 (en)
CA (1) CA1180788A (en)
ES (1) ES8306264A1 (en)
NL (1) NL8203849A (en)
NO (1) NO156349C (en)
ZA (1) ZA826195B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4509039A (en) * 1983-07-05 1985-04-02 Minnesota Mining And Manufacturing Company Shielded, closely spaced transmit-receiver antennas for electronic article surveillance system
NL8803170A (en) * 1988-12-27 1990-07-16 Nedap Nv IDENTIFICATION SYSTEM.
US5382780A (en) * 1993-10-01 1995-01-17 Duncan Industries Parking Control Systems Corp. Portable time metering device
JPH07263935A (en) * 1994-03-24 1995-10-13 Hochiki Corp Antenna equipment

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5645200B2 (en) * 1973-03-10 1981-10-24
US4243980A (en) * 1978-02-17 1981-01-06 Lichtblau G J Antenna system for electronic security installations

Also Published As

Publication number Publication date
ES515888A0 (en) 1983-06-01
NO823180L (en) 1983-04-06
AU8867082A (en) 1983-04-14
JPS58121495A (en) 1983-07-19
JPH0354392B2 (en) 1991-08-20
ES8306264A1 (en) 1983-06-01
NO156349C (en) 1987-09-02
AU535114B2 (en) 1984-03-01
CA1180788A (en) 1985-01-08
ZA826195B (en) 1983-07-27
NL8203849A (en) 1983-05-02

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