WO2000017812A1 - Systeme d'identification encastrable et identifiable a distance - Google Patents

Systeme d'identification encastrable et identifiable a distance Download PDF

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Publication number
WO2000017812A1
WO2000017812A1 PCT/US1999/002412 US9902412W WO0017812A1 WO 2000017812 A1 WO2000017812 A1 WO 2000017812A1 US 9902412 W US9902412 W US 9902412W WO 0017812 A1 WO0017812 A1 WO 0017812A1
Authority
WO
WIPO (PCT)
Prior art keywords
marker
magnetic field
soft ferromagnetic
magnetic
edges
Prior art date
Application number
PCT/US1999/002412
Other languages
English (en)
Inventor
Daniel Lacave
Kay-Uwe Schenke
Gregg A. Vandesteeg
Original Assignee
Minnesota Mining And Manufacturing Company
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 Minnesota Mining And Manufacturing Company filed Critical Minnesota Mining And Manufacturing Company
Priority to JP2000571402A priority Critical patent/JP2002525946A/ja
Priority to EP99905728A priority patent/EP1112551A1/fr
Priority to KR1020017003492A priority patent/KR20010075197A/ko
Priority to CA002341462A priority patent/CA2341462A1/fr
Publication of WO2000017812A1 publication Critical patent/WO2000017812A1/fr

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/06187—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with magnetically detectable marking

Definitions

  • the system should provide a marking device compatible preferably with the manufacturing process for such parts, not easily copied, modified or transferred to other parts of inferior quality, having a large enough information storage capacity that the necessary data for confirming the origin of the part (manufacturer, date of manufacture, certification mark and date, etc.) can be stored and preferably the marking device does not influence the mechanical properties, in particular the lifetime of the part under working stress conditions.
  • Aircraft wings and fuselage may include an outer skin of an aluminium laminate as described, for instance, in EP-A-056 289. Such structures rely for their strength on the intactness of all the layers of the laminate. Further, for aerodynamic reasons, it is not desirable to have protrusions above the surface of the laminate.
  • US 4,733,079 and US 4,795,906 propose a method of altering the infra-red reflection properties of an aircraft part to form a code and to detect these differences using an infra-red source and a detector.
  • the disadvantage of this method and any similar method using any other form of optical or near-optical detection method such as a bar-code is that the markings must be on the surface of the part. They are easily accessible and can be modified or easily transferred many times to inferior parts.
  • transponders include semiconductor memory and processing elements. Such devices are limited in the processing temperature they can tolerate. The temperatures used to bake the aluminium laminate of an aircraft wing are much too high for such devices to function reliably afterwards. Also, any data which is stored on a semiconductor device can be destroyed by electromagnetic radiation if this is of high enough energy. During a lightning strike on an aircraft very high electrical currents can flow in a thin outer layer of the fuselage and wings. These currents can produce large local electric and magnetic fields which could seriously affect any semiconductor device located just underneath the surface.
  • the present invention may include an article including an identification marker, the marker including stored information, said article comprising a first conductive layer, said conductive layer restricting mechanical and RF access to said marker; and said marker being visually camouflageable beneath said conductive layer and being non-destructively and non-invasively measurable through said conductive layer.
  • Fig. 2 shows identification pulses produced by an identification system in accordance with an embodiment of the present invention
  • a preferred embodiment of the present invention includes providing an identification system having an object (such as an aircraft part) with a marker 10 including at least one elongate soft ferromagnetic element 9 (with or without a control or keeper element), the marker 10 being embedded in the object underneath a conductive layer which restricts RF and mechanical access.
  • the conductive layer 2 may have a value V of greater than 300, where V is given by: (thickness of conductive layer in mm) 2 x (relative magnetic permeability of the conductive layer) / (specific resistivity of conductive layer in ohm. mm).
  • ferromagnetic material includes conductive and non-conductive ferromagnetic materials, e.g. ferrites, amorphous metal alloys.
  • H o) of greater than 10,000.
  • Suitable materials may have a permeability of 250,000 or even 400,000. It is also advantageous if the material has some remanence, in particular in the range 50 to 95% of the magnetic saturation.
  • the adhesive bond used in the metal laminates 12 was the AF-163-2-OST made by the Minnesota Mining and Manufacturing Co., St. Paul, USA (3M).
  • the patches 13 (specimens 1-4, table 5) were bonded with AF 163-2K, also made by 3M. Both adhesives are produced with a carrier, the difference is that the 2K-version has a woven carrier, where the OST-version has randomly orientated fibres.
  • For the markers 10 an area of 170 mm by 100 mm was used. For testing, it was found that the undisturbed material next to the markers 10 should be at least 25 mm on each side of the label, resulting in an aluminium laminated specimen and a patch 13 of at least 150 mm wide.
  • the lay-out of the specimens was as follows (see Table 5):
  • the magnetic field generator-detector 20 in accordance with the invention may be designed to produce a magnetic field which may have a magnitude in the range 5 to 400 Gauss.
  • the coils 21, 22 of the magnetic field generator-detector 20 may be driven so that they generate a magnetic field whose magnetic field vector has a substantially constant magnitude and moves through the 2- dimensional interrogation zone 29 in a sequence of different orientations or rotates smoothly.
  • the output of the receiving coils 23, 24 may be fed to a controller and electronic signal processing device for segregation of the detected pulses from stray noise. Pulse wave shaping circuits may improve pulse quality to output the signal sequence.
  • the orientations of the magnetic field vector may be selected randomly or may follow any particular regular sequence.
  • Each element 9 may also consist of a laminate of a soft ferromagnetic 19 and a remanent material 15 as described in US-A-4746908 and shown schematically in Fig. 1 IB. If the marker 10 is placed in a powerful decreasing oscillating magnetic field the keeper element 15 is de-magnetised and each elongate element 9 can now generate pulses. For instance, when embedded within articles in a shop to prevent pilfering, the keeper element 15 is first de-magnetised. After purchase it is magnetised so that the marker 10 does not activate the detection system.
  • markers 10 are used in a detection system in accordance with the present invention including means to generate a magnetic field having a substantially constant magnitude and the markers 10 are detected by varying the relative orientation of the marker 10 and the magnetic field vector having a substantially constant magnitude.
  • the detection system may also include a conventional detection system as described in US-A- 4746908, 3983552, 3747086 or 3665449 in addition to the detection system in accordance with the present invention.
  • the conventional system can be used to locate the approximate position of the marker 10 and the detection system in accordance with the present invention may be used to read out the code.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

Marqueur (10) d'identification encastrable et mesurable de manière non effractive et non destructive, qui peut être lu malgré une couche de couverture (2) qui en réduit considérablement la radiofréquence et l'accès mécanique. Ledit marqueur (10) peut contenir en mémoire des données de plus de 16 bits. Il est de préférence lisible à distance, non effaçable par le rayonnement électromagnétique, peut être camouflé visuellement et les informations qui y sont enregistrées résistent à l'exposition à des températures élevées, ce qui rend ledit marqueur approprié pour une utilisation dans des applications pour lesquelles la sécurité est un facteur critique. Un système de détection dudit marqueur (10) d'identification est également décrit. -
PCT/US1999/002412 1998-09-18 1999-02-04 Systeme d'identification encastrable et identifiable a distance WO2000017812A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2000571402A JP2002525946A (ja) 1998-09-18 1999-02-04 埋め込み式遠隔識別可能な識別システム
EP99905728A EP1112551A1 (fr) 1998-09-18 1999-02-04 Systeme d'identification encastrable et identifiable a distance
KR1020017003492A KR20010075197A (ko) 1998-09-18 1999-02-04 내장 가능하고 원격 확인 가능한 확인 시스템
CA002341462A CA2341462A1 (fr) 1998-09-18 1999-02-04 Systeme d'identification encastrable et identifiable a distance

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15722598A 1998-09-18 1998-09-18
US09/157,225 1998-09-18

Publications (1)

Publication Number Publication Date
WO2000017812A1 true WO2000017812A1 (fr) 2000-03-30

Family

ID=22562842

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/002412 WO2000017812A1 (fr) 1998-09-18 1999-02-04 Systeme d'identification encastrable et identifiable a distance

Country Status (6)

Country Link
EP (1) EP1112551A1 (fr)
JP (1) JP2002525946A (fr)
KR (1) KR20010075197A (fr)
CN (1) CN1318175A (fr)
CA (1) CA2341462A1 (fr)
WO (1) WO2000017812A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4525242B2 (ja) * 2004-08-23 2010-08-18 富士ゼロックス株式会社 磁性体が付与された媒体および磁性体検知装置
KR101703842B1 (ko) 2013-03-05 2017-02-08 주식회사 아모센스 자기장 및 전자파 차폐용 복합시트 및 이를 구비하는 안테나 모듈
KR101640783B1 (ko) * 2016-04-11 2016-07-19 국방과학연구소 탈부착 가능한 전자기파 흡수 구조체

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622542A (en) * 1985-06-26 1986-11-11 Controlled Information Corporation Magnetic article surveillance system, method and coded marker
EP0452162A1 (fr) * 1990-03-07 1991-10-16 Caoutchouc Manufacture Et Plastiques Moyen de repérage linéaire de longueur, de vitesse ou de positionnement pour article souple de grande longueur
US5353010A (en) * 1992-01-03 1994-10-04 Minnesota Mining And Manufacturing Company Device and a method for detecting a magnetizable marker element
EP0713195A1 (fr) * 1994-11-17 1996-05-22 Minnesota Mining And Manufacturing Company Système d'identification à distance
US5597653A (en) * 1993-01-27 1997-01-28 Unitika Ltd. Antitheft label for use on objects and an absorptive pad having such an antitheft label for use on food

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1978899A (en) * 1998-01-12 1999-07-26 Sentec Ltd. Magnetic data tagging

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622542A (en) * 1985-06-26 1986-11-11 Controlled Information Corporation Magnetic article surveillance system, method and coded marker
EP0452162A1 (fr) * 1990-03-07 1991-10-16 Caoutchouc Manufacture Et Plastiques Moyen de repérage linéaire de longueur, de vitesse ou de positionnement pour article souple de grande longueur
US5353010A (en) * 1992-01-03 1994-10-04 Minnesota Mining And Manufacturing Company Device and a method for detecting a magnetizable marker element
US5597653A (en) * 1993-01-27 1997-01-28 Unitika Ltd. Antitheft label for use on objects and an absorptive pad having such an antitheft label for use on food
EP0713195A1 (fr) * 1994-11-17 1996-05-22 Minnesota Mining And Manufacturing Company Système d'identification à distance

Also Published As

Publication number Publication date
EP1112551A1 (fr) 2001-07-04
KR20010075197A (ko) 2001-08-09
JP2002525946A (ja) 2002-08-13
CA2341462A1 (fr) 2000-03-30
CN1318175A (zh) 2001-10-17

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