EP0102405B1 - Ultraschallidentitätssiegel - Google Patents

Ultraschallidentitätssiegel Download PDF

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Publication number
EP0102405B1
EP0102405B1 EP19820108127 EP82108127A EP0102405B1 EP 0102405 B1 EP0102405 B1 EP 0102405B1 EP 19820108127 EP19820108127 EP 19820108127 EP 82108127 A EP82108127 A EP 82108127A EP 0102405 B1 EP0102405 B1 EP 0102405B1
Authority
EP
European Patent Office
Prior art keywords
delay line
seal
disk
diameter
identity
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
Application number
EP19820108127
Other languages
English (en)
French (fr)
Other versions
EP0102405A1 (de
Inventor
René Denis
Giulio Ghiringhelli
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.)
European Atomic Energy Community Euratom
Original Assignee
European Atomic Energy Community Euratom
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 European Atomic Energy Community Euratom filed Critical European Atomic Energy Community Euratom
Priority to EP19820108127 priority Critical patent/EP0102405B1/de
Priority to DE8282108127T priority patent/DE3275035D1/de
Publication of EP0102405A1 publication Critical patent/EP0102405A1/de
Application granted granted Critical
Publication of EP0102405B1 publication Critical patent/EP0102405B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F3/03—Forms or constructions of security seals
    • G09F3/0376—Forms or constructions of security seals using a special technique to detect tampering, e.g. by ultrasonic or optical means

Definitions

  • the invention relates to an ultrasonic signature seal comprising in an cylindrical housing an ultrasonic transducer associated axially with a metallic delay line.
  • the cylindrical housing engages in a washer so that the free end of the delay line is visible in the central hole of the washer and gives the main elements of identity.
  • Resins have been observed to be temperature sensitive, which is detrimental to a precise definition of identity and thus reduces the degree of protection against attempted fraud.
  • the main object of the invention is therefore to provide a seal as specified above, which receives its final identity only when the seal is assembled and closed, which makes any subsequent fraudulent manipulation apparent on the seal. as a change of identity.
  • the transducer and the delay line are made integral by bonding and then coated in a resin loaded with non-conductive particles and by a cylindrical housing by turning this resin.
  • this set can be handled and stored without special precautions, and it can be reused several times, each time presenting a different identity.
  • this seal is designed to receive a security or sealing thread.
  • the housing has two zones of different external diameters, the zone of smaller diameter being close to the free end of the delay line and receiving this safety wire. The two strands of the safety wire pass between the washer and the housing.
  • the free end of the delay line spherical and convex and to mark this spherical surface, which gives the main elements of the 'identity.
  • the spherical shape ensures a focusing effect of the waves reflected on this surface.
  • Fig. 1 shows a longitudinal section through a seal according to the invention.
  • Fig. 2 shows the same seal in orthogonal partial section along a line II-II of FIG. 1.
  • an ultrasonic transducer (5 MHz) 1, which is provided with an electrical contact 2 serving on the one hand for the transmission of an electrical excitation pulse towards the transducer in emission and on the other hand for the transmission of a response signal to an amplifier (not shown) in reception.
  • the transducer 1 is attached to a delay line 3 made of aluminum, the free end 4 of which is visible through a hole 5 in a washer 6.
  • This delay line namely a zone of square section close to the transducer 1, a cylindrical zone, which fits into the cylindrical part of the holes 5, and an external zone of frustoconical shape and of increasing diameter towards the outside.
  • the hole 5 of the washer 6 itself comprises said cylindrical part and a part of frustoconical shape, but of a diameter such that there remains a conical slot between the end of the delay line 3 and the washer 6.
  • This slot is filled at the end of assembly by an annular rivet 7 of annealed aluminum, which is force-fitted.
  • the transducer 1, its contract 2 and the interior zone of the delay line 3 are coated with a resin 8 loaded with non-conductive powder and contained in a cylindrical casing 9, which has a zone of smaller diameter close to the free end of the delay line.
  • the washer 6 has for its part an edge of outside and inside diameters similar to the outside and inside diameters of the housing hor of said zone.
  • a safety wire 10 passes before assembly between the edge of the washer 6 and the housing 9 on either side of the delay line. When sealing it is deformed as shown in the figures.
  • the response of the seal to an ultrasonic pulse depends on the one hand on the more or less reproducible shape of the delay line and on the other hand on the random marking, which is practiced on the spherical surface of the end 4 of the line to delay.
  • This marking and the streaks originating from the forced insertion of the rivet 7 into the slot constitute the ultrasonic identity of the seal.
  • the wave emitted by the transducer 1 is reflected in various modes (surface waves and transverse waves), which ensures uniqueness of identity.
  • various modes surface waves and transverse waves
  • These peaks depend mainly on the marking of the outer surface of the end 4, because the reflections on this surface are detected by the transducer in priority.
  • the invention is not limited to the embodiment cited above.
  • the seal can be adapted in the context of the invention to a wireless security use, in which the washer 6 is an integral part of the object to be protected.
  • the transducer is excited by an electric pulse and then the analog signal of response of the transducer is compared with a preset analog signal.
  • the analog signal of response of the transducer is compared with a preset analog signal.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Burglar Alarm Systems (AREA)

Claims (5)

1. Ultraschallidentitätssiegel mit einer Lochscheibe (6) und einem Ultraschalltransduktor (1), der fest und axial mit einer metallischen Verzögerungsleitung (3) verbunden ist, dadurch gekennzeichnet, daß das zentrale Loch (5) der Lochscheibe, aus dem das freie Ende (4) der Verzögerungsleitung hervortritt, und dieses Ende (4) der Verzögerungsleitung (3) beide kegelstumpfförmig sind, so daß nach dem Zusammenbau ein konischer ringförmiger Schlitz mit sich nach außen vergrößerndem Durchmesser bleibt, der von einem ringförmigen Niet (7) aus Weichmetall ausgefüllt wird, wodurch dieser Niet die Lochscheibe und die Verzögerungsleitung fest miteinander verbindet, wobei die wesentlichen Elemente der Ultraschallidentität des Siegels durch die äußere Form dieses Endes gegeben sind.
2. Siegel nach Anspruch 1, dadurch gekennzeichnet, daß der Transduktor (1) und die Verzögerungsleitung (3) durch eine Umhüllung (8) aus einem mit nicht-leitenden Partikeln befrachteten Harz und durch ein dieses Harz umgebendes zylindrisches Gehäuse (9) geschützt werden.
3. Siegel nach Anspruch 2, dadurch gekennzeichnet, daß das Gehäuse (9) zwei Bereiche unterschiedlichen äußeren Durchmessers aufweist, wobei der Bereich mit kleinerem Durchmesser nahe dem freien Ende (4) der Verzögerungsleitung (3) liegt und ein Sicherheitsdraht (10) zwischen einem Rand der Lochscheibe (6) und den Bereich kleineren Durchmessers des Gehäuses verläuft.
4. Siegel nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das freie Ende (4) der Verzögerungsleitung (3) eine konvexe Kugelform aufweist, die eine Zufalls-Markierung trägt, welche die wesentlichen Elemente der Identität angibt.
5. Siegel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Loch (5) der Lochscheibe (6) einerseits und das Ende (4) oder Verzögerungsleitung (3) andererseits je einen konischen äußeren Bereich und einen zylindrischen inneren Bereich aufweisen, wobei der Durchmesser des inneren Bereichs der Lochscheibe kleiner als der kleinste Durchmesser im konischen Bereich der Lochscheibe und nur geringfügig größer als der größte Durchmesser des konischen Bereichs der Verzögerungsleitung (3) ist.
EP19820108127 1982-09-03 1982-09-03 Ultraschallidentitätssiegel Expired EP0102405B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19820108127 EP0102405B1 (de) 1982-09-03 1982-09-03 Ultraschallidentitätssiegel
DE8282108127T DE3275035D1 (en) 1982-09-03 1982-09-03 Ultrasonic identity seal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19820108127 EP0102405B1 (de) 1982-09-03 1982-09-03 Ultraschallidentitätssiegel

Publications (2)

Publication Number Publication Date
EP0102405A1 EP0102405A1 (de) 1984-03-14
EP0102405B1 true EP0102405B1 (de) 1987-01-07

Family

ID=8189207

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820108127 Expired EP0102405B1 (de) 1982-09-03 1982-09-03 Ultraschallidentitätssiegel

Country Status (2)

Country Link
EP (1) EP0102405B1 (de)
DE (1) DE3275035D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570533B1 (fr) * 1984-09-18 1987-05-22 Commissariat Energie Atomique Sceau ultrasonore a cable

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2972068A (en) * 1956-07-06 1961-02-14 Automation Instr Inc Uni-directional ultrasonic transducer
US4359903A (en) * 1979-04-24 1982-11-23 European Atomic Energy Community (Euratom) System for the identification of objects, for example nuclear fuel elements
US4295377A (en) * 1979-07-12 1981-10-20 General Dynamics Corporation Fastener incorporating removable ultrasonic transducer

Also Published As

Publication number Publication date
DE3275035D1 (en) 1987-02-12
EP0102405A1 (de) 1984-03-14

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