EP0409343A1 - Vehicle identification system - Google Patents

Vehicle identification system Download PDF

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Publication number
EP0409343A1
EP0409343A1 EP90201931A EP90201931A EP0409343A1 EP 0409343 A1 EP0409343 A1 EP 0409343A1 EP 90201931 A EP90201931 A EP 90201931A EP 90201931 A EP90201931 A EP 90201931A EP 0409343 A1 EP0409343 A1 EP 0409343A1
Authority
EP
European Patent Office
Prior art keywords
responder
vehicle
vicinity
vehicles
electromagnetic
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Withdrawn
Application number
EP90201931A
Other languages
German (de)
English (en)
French (fr)
Inventor
Willem Hendrik Jacob Venema
Jan Saeys
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nederlandsche Apparatenfabriek NEDAP NV
Original Assignee
Nederlandsche Apparatenfabriek NEDAP NV
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 Nederlandsche Apparatenfabriek NEDAP NV filed Critical Nederlandsche Apparatenfabriek NEDAP NV
Publication of EP0409343A1 publication Critical patent/EP0409343A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles

Definitions

  • This invention relates to an electromagnetic detection and identification system for identifying vehicles or their occupants by means of an interrogation field generated by a transmitter/receiver through an antenna coil.
  • Electromagnetic detection and identification systems for identifying human beings, animals and goods, including various systems of the present applicants, are well-known. Such identification systems can be used, for example, for permitting or refusing access to premises, for feeding animals, and for monitoring and supervising logistic processes.
  • An electromagnetic detection and identification system is described in Netherlands patent specification 176404. Such systems operate as follows. An electromagnetic A.C. field is generated by a transmitter/receiver. Identification labels, also referred to as responders, are provided with an electronic circuit including at least a resonant circuit and a coding device. If the responder is moved into an electromagnetic A.C. field generated by the transmitter/receiver (the interrogation field), the resonant circuit will start resonating. By means of the resonant circuit, the responder circuit is capable of withdrawing electrical energy from the field. This energy is used, after rectification, to provide the coding device with supply power.
  • the coding device then generates a code which through the same coil and the same electromagnetic field can be identified by the transmitter/receiver.
  • identification systems can achieve a detection distance of about 90 cm.
  • the drawback of the prior systems is that, for a number of uses, this distance is insufficient. Under certain conditions, detection is even downright impossible. In the case, for example, of persons seated in (metallic) vehicles, such as motorcars, detection is basically impossible, as the metal construction virtually is a perfect electromagnetic screen (Faraday cage). Furthermore, if identification is possible after all, the detection distance would be insufficient for the system to function properly in practice for the identification of vehicles.
  • a system of the above-described kind is characterized in that the vehicles are provided with an opening surrounded by at least one frame and that, in operation, a responder is arranged in the vicinity of said frame.
  • the transmitter/receiver generates an electromagnetic A.C. field.
  • the field lines generated induce a current along the metallic parts surrounding vehicle openings, such as windows
  • the current induced which is concentrated in the post, will in turn generate an electromagnetic field in the resonant circuit. Owing to the existence of a second field, the electromagnetic field of the transmitter/receiver will be concentrated.
  • the form of the electromagnetic field of the transmitter/receiver is influenced by using a metallic floor plate, which is positioned in or on the roadway to extend partly under a vehicle in the longitudinal direction.
  • the floor plate will cause a portion of the magnetic field lines of the electromagnetic field generated by the transmitter/receiver to be concentrated in the direction of the vehicle.
  • the responder is capable of drawing more electrical power from the more concentrated electromagnetic field to generate a code, which can be detected, via the same electromagnetic field, by the transmitter/receiver. Owing to the more concentrated electromagnetic field, a larger detection distance can be bridged than the conventional 90 cm.
  • Fig. 1 shows a transmitting antenna 1 with a vehicle 2, in this case a passenger car.
  • the field lines 3 of transmitting antenna 1 extend towards vehicle 2.
  • Vehicle 2 is within an electromagnetic field generated through the transmitting antenna by a transmitter/receiver 10.
  • an electrical current is generated in the metallic parts which surround openings, such as windows and doorways, of vehicle 2. Owing to the presence of the openings, a concentration of these induced currents is brought about.
  • a metallic floor plate 9 may be provided, which promotes that the field formed by antenna 1 is concentrated in the direction of vehicle 2.
  • Fig. 2 shows a practical arrangement.
  • Antenna 1 is arranged next to the vehicle and is dimensioned to match the dimension of the vehicles to be identified. For example, for passenger cars the antenna coil may be 4 m long and 1 m high.
  • a floor plate 9 is again provided to bring about a concentration effect with regard to the electromagnetic field.
  • the (A.C.) current i induced around window opening 4 by the interrogation field generates in turn an electromagnetic A.C. field, which can serve as an interrogation field for a responder.
  • a responder placed within the field generated by the current i around a window post 6 is shown schematically at 7 in Fig. 2. All this is shown in more detail in Fig. 3.
  • Fig. 3 shows a responder 7 in the vicinity of post 6.
  • the current i in post 6 generates an electromagnetic A.C. field 8.
  • the responder 7 is positioned so as to achieve maximum coupling for this application, the intake of electrical energy will be relatively high.
  • the responder 7 is preferably arranged in one of the corners of the window or doorway. In fact, the field is concentrated in the vicinity of the corner of a window or doorway, at least in the interior zone of the angle.
  • responder 7 is shown to be positioned in the vicinity of the front bottom corner of the window opening of a passenger car 2. Alternatively, however, the responder may be positioned in the vicinity of any of the other corners.
  • the transmitting antenna should be positioned so that the current flows optimally through the vehicle posts.
  • the antenna is preferably disposed in a vertical plane to extend substantially parallel to the side of the vehicles to be identified.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lock And Its Accessories (AREA)
  • Near-Field Transmission Systems (AREA)
EP90201931A 1989-07-17 1990-07-16 Vehicle identification system Withdrawn EP0409343A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8901836A NL8901836A (nl) 1989-07-17 1989-07-17 Voertuiglabel.
NL8901836 1989-07-17

Publications (1)

Publication Number Publication Date
EP0409343A1 true EP0409343A1 (en) 1991-01-23

Family

ID=19855049

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90201931A Withdrawn EP0409343A1 (en) 1989-07-17 1990-07-16 Vehicle identification system

Country Status (3)

Country Link
EP (1) EP0409343A1 (nl)
CA (1) CA2021223A1 (nl)
NL (1) NL8901836A (nl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0590589A1 (en) * 1992-09-28 1994-04-06 Texas Instruments Incorporated Transponder antenna with shield
WO1996027844A2 (de) * 1995-03-07 1996-09-12 Licentia Patent-Verwaltungs-Gmbh Transponderanordnung für elektromagnetische abfragesysteme
US5557279A (en) * 1993-09-28 1996-09-17 Texas Instruments Incorporated Unitarily-tuned transponder/shield assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110864632B (zh) * 2019-11-27 2021-03-02 上海名图软件有限公司 一种用于安检的车窗玻璃检测系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002469A1 (de) * 1977-12-05 1979-06-27 Siemens Aktiengesellschaft Einrichtung zur Identifizierung von Fahrzeugen
EP0040544A2 (en) * 1980-05-19 1981-11-25 Cotag International Limited Coded information arrangement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002469A1 (de) * 1977-12-05 1979-06-27 Siemens Aktiengesellschaft Einrichtung zur Identifizierung von Fahrzeugen
EP0040544A2 (en) * 1980-05-19 1981-11-25 Cotag International Limited Coded information arrangement

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0590589A1 (en) * 1992-09-28 1994-04-06 Texas Instruments Incorporated Transponder antenna with shield
US5557279A (en) * 1993-09-28 1996-09-17 Texas Instruments Incorporated Unitarily-tuned transponder/shield assembly
WO1996027844A2 (de) * 1995-03-07 1996-09-12 Licentia Patent-Verwaltungs-Gmbh Transponderanordnung für elektromagnetische abfragesysteme
WO1996027844A3 (de) * 1995-03-07 1997-03-13 Licentia Gmbh Transponderanordnung für elektromagnetische abfragesysteme

Also Published As

Publication number Publication date
CA2021223A1 (en) 1991-01-18
NL8901836A (nl) 1991-02-18

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