EP0102405A1 - Ultrasonic identity seal - Google Patents

Ultrasonic identity seal Download PDF

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Publication number
EP0102405A1
EP0102405A1 EP82108127A EP82108127A EP0102405A1 EP 0102405 A1 EP0102405 A1 EP 0102405A1 EP 82108127 A EP82108127 A EP 82108127A EP 82108127 A EP82108127 A EP 82108127A EP 0102405 A1 EP0102405 A1 EP 0102405A1
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EP
European Patent Office
Prior art keywords
delay line
washer
seal
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.)
Granted
Application number
EP82108127A
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German (de)
French (fr)
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EP0102405B1 (en
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
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European Atomic Energy Community Euratom
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Publication date
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Priority to EP19820108127 priority Critical patent/EP0102405B1/en
Priority to DE8282108127T priority patent/DE3275035D1/en
Publication of EP0102405A1 publication Critical patent/EP0102405A1/en
Application granted granted Critical
Publication of EP0102405B1 publication Critical patent/EP0102405B1/en
Expired legal-status Critical Current

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    • 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 during the assembly and closing of the seal, which makes apparent any subsequent fraudulent manipulation su4e seal in 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 casing surrounding 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 elements of identity.
  • the spherical shape ensures a focusing effect of the waves reflected on this surface.
  • 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 hole 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 contact 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 housing 9, which has a zone of smaller diameter in proximity 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 outside 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.
  • 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. It is also possible to use other materials than aluminum for the delay line, annealed aluminum for the rivet 7 and duralum for the housing 9 and the washer 6. In particular, one can choose a material washer insulating, the earth contact being brought to the transducer by the housing 9 and the safety wire.
  • the transducer is excited by an electrical 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)

Abstract

1. An ultrasonic identity seal comprising a disc (6) and an ultrasonic transducer (1) associated stationarily and axially to a metal delay line (3), characterized in that the central hole (5) of the disk, in which the free end (4) of this delay line is visible, and said end (4) of the delay line (3) each have a truncated shape so that, after the assembly, there remains a circular conical slot which increases in diameter from the inside to the outside and which is filled by an annular rivet (7) of soft metal, this rivet thus fixing the disk and the delay line to each other, the principal elements of the ultrasonic identity of the seal being given by the outer form of said end.

Description

L'invention se réfère à un sceau a signature ultrasonore comportant dans un boîtier cylindrique un transducteur ultrasonore associé axialement à une ligne à retard métallique.The invention relates to an ultrasonic signature seal comprising in an cylindrical housing an ultrasonic transducer associated axially with a metallic delay line.

Le boîtier cylindrique s'engage dans une rondelle de telle sorte que l'extrémité libre de la ligne à retard est apparente dans le trou central de la rondelle et donne les éléments principaux de l'identité.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.

Le scellement d'un conteneur, d'une porte, d'un couvercle ou d'un paquet doit permettre d'une part d'identifier le matériel sous scellement et d'autre part de contrôler l'intégrité du scellement proprement dit. Dans le document UK-A 79 14 203, on décrit un système de contrôle à l'aide de cette technique ultrasonore. En cas de démontage du sceau, l'élément de fixation qui joue le rôle d'une ligne à retard se casse, ce qui change la réponse du transducteur qui lui est associé. L'identité du sceau est définie par le signal donné par la répartition aléatoire de grains métalliques dans une résine, "vue" par un deuxième transducteur intégré dans le sceau.The sealing of a container, a door, a lid or a package must make it possible on the one hand to identify the material under seal and on the other hand to check the integrity of the seal itself. Document UK-A 79 14 203 describes a control system using this ultrasonic technique. If the seal is removed, the fastening element which acts as a delay line breaks, which changes the response of the transducer associated with it. The identity of the seal is defined by the signal given by the random distribution of metallic grains in a resin, "seen" by a second transducer integrated in the seal.

On a observé que les résines sont sensibles aux températures, ce qui est nuisible à une définition précise de l'identité et réduit ainsi le degré de protection contre une tentative de fraude.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.

On sait qu'une ligne à retard métallique est moins sensible à des changements de température, mais jusqu'ici, on n'avait pas encore trouvé une méthode simple pour donner à une telle ligne à retard un caractère unique permettant son identification par son comportement ultrasonore.We know that a metallic delay line is less sensitive to temperature changes, but until now, we had not yet found a simple method to give such a delay line a unique character allowing its identification by its behavior ultrasonic.

Le but principale de l'invention est donc de proposer un sceau tel que spécifié ci-dessus, qui ne reçoit son identité définitive que lors de l'assemblage et de la fermeture du sceau, ce qui rend apparente toute manipulation frauduleuse ultérieure su4e sceau en tant que modification de l'identité.The main object of the invention is therefore to provide a seal as specified above, which receives its final identity only during the assembly and closing of the seal, which makes apparent any subsequent fraudulent manipulation su4e seal in as a change of identity.

Ce but est atteint par le sceau tel que spécifié ci-dessus, qui est caractérisé selon l'invention par le fait que le trou de la rondelle et l'extrémité de la ligne à retard ont chacun une forme tronconique telle qu'après assemblage, il reste une fente circulaire conique de diamètre croissant vers l'extérieur qui est comblée par un rivet annulaire en métal mou.This object is achieved by the seal as specified above, which is characterized according to the invention by the fact that the hole in the washer and the end of the delay line each have a frustoconical shape such that after assembly, there remains a conical circular slot of increasing diameter towards the outside which is filled by an annular soft metal rivet.

La fermeture du sceau par insertion de la ligne à retard dans le trou de la rondelle et par introduction à force du rivet dans cette fente n'est donc pas possible sans modification de l'identité ultrasonore du sceau.Closing the seal by inserting the delay line into the hole in the washer and by forcing the rivet into this slot is therefore not possible without modifying the ultrasonic identity of the seal.

De préférence, le transducteur et la ligne à retard sont rendus solidaires par collage puis enrobés dans une résine chargée de particules non conductrices et par un boîtier cylindrique entourant cette résine. Ainsi, cet ensemble peut être manipulé et stocké sans précaution particulière, et il peut être réutilisé plusieurs fois en présentant chaque fois une identité différente.Preferably, 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 casing surrounding this resin. Thus, this set can be handled and stored without special precautions, and it can be reused several times, each time presenting a different identity.

De préférence, ce sceau est conçu pour recevoir un fil de sécurité ou de scellement. A ces fins, le boîtier comporte deux zones de diamètres extérieurs différents, la zone de diamètre plus faible étant proche de l'extrémité libre de la ligne à retard et recevant ce fil de sécurité. Les deux brins du fil de sécurité passent entre la rondelle et le boîtier.Preferably, this seal is designed to receive a security or sealing thread. For these purposes, 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.

Bien que toutes les irrégularités de la ligne à retard contribuent à l'identité du sceau, il est préférable de rendre l'extrémité libre de la ligne à retard sphérique et convexe et de marquer cette surface sphérique, ce qui donne les éléments principaux de l'identité. La forme sphérique assure un effet de focalisation des ondes réfléchies sur cette surface.Although all the irregularities of the delay line contribute to the identity of the seal, it is preferable to make the free end of the delay line spherical and convex and to mark this spherical surface, which gives the elements of identity. The spherical shape ensures a focusing effect of the waves reflected on this surface.

L'invention sera décrite ci-après plus en détail à l'aide d'un exemple de réalisation et de deux figures.

  • La fig. 1 représente une coupe longitudinale à travers un sceau selon l'invention.
  • La fig. 2 montre le même sceau en coupe partielle orthogonale selon une ligne II-II de la fig. 1.
The invention will be described below in more detail using an embodiment and two figures.
  • 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.

Sur la fig. 1, on voit un transducteur ultrasonore (5 MHz) 1, qui est muni d'un contact électrique 2 servant d'une part à la transmission d'une impulsion électrique d'excitation vers le transducteur en émission et d'autre part à la transmission d'un signal de réponse vers un amplificateur (non représenté) en réception.In fig. 1, we see 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.

Le transducteur 1 est accolé à une ligne à retard 3 en aluminium dont l'extrémité libre 4 est apparente à travers un trou 5 dans une rondelle 6. On distingue trois zones sur cette ligne à retard, à savoir une zone de section carrée proche du transducteur 1, une zone cylindrique, qui s'ajuste dans la partie cylindrique du trou 5, et une zone extérieure de forme tronconique et de diamètre croissant vers l'extérieur. Le trou 5 de la rondelle 6 comporte lui-même ladite partie cylindrique et une partie de forme tronconique, mais de diamètre tel qu'il reste une fente conique entre l'extrémité de la ligne à retard 3 et la rondelle 6.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. There are three zones on 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 hole 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.

Cette fente est comblée en fin d'assemblage par un rivet annulaire 7 en aluminium recuit, qui est introduit à force.This slot is filled at the end of assembly by an annular rivet 7 of annealed aluminum, which is force-fitted.

Le transducteur 1, son contact 2 et la zone intérieure de la ligne à retard 3 sont enrobés d'une résine 8 chargée de poudre non conductrice et contenus dans un boîtier 9 cylindrique, qui présente une zone de diamètre plus faible en proximité de l'extrémité libre de la ligne à retard.The transducer 1, its contact 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 housing 9, which has a zone of smaller diameter in proximity to the free end of the delay line.

La rondelle 6 présente de son côté une bordure de diamètres extérieur et intérieure similaires aux diamètres extérieur et intérieur du boîtier hors de ladite zone.The washer 6 has for its part an edge of outside and inside diameters similar to the outside and inside diameters of the housing outside of said zone.

Un fil de sécurité 10 passe avant assemblage entre la bordure de la rondelle 6 et le boîtier 9 de part et d'autre de la ligne à retard. Lors du scellement il est déformé comme l'indiquent les figures.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.

La réponse du sceau à une impulsion ultrasonore dépend d'une part de la forme plus ou moins reproductible de la ligne à retard et d'autre part du marquage aléatoire, qui est pratiqué sur la surface sphérique de l'extrémité 4 de la ligne à retard.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.

Ce marquage et les stries provenant de l'insertion à force du rivet 7 dans la fente constituent l'identité ultrasonore du sceau.This marking and the streaks originating from the forced insertion of the rivet 7 into the slot constitute the ultrasonic identity of the seal.

Lors de l'assemblage d'un sceau, on passe d'abord les deux brins du fil de sécurité entre la rondelle 6 et le boîtier 9, contenant le transducteur 1 avec son contact 2 et la ligne à retard 3, ce qui donne au fil de sécurité un double pli. Pour maintenir cet ensemble en position dans la rondelle, on insert à force un rivet 7 en aluminium recuit dans la fente entre la rondelle 6 et l'extrémité 4 de la ligne à retard. Ce rivet a initialement une forme cylindrique et se déforme coniquement lors de l'insertion. Pour réduire la force d'insertion et ainsi l'épaisseur du rivet annulaire, on choisit le diamètre le plus grand de la partie conique de l'extrémité 4 de la ligne à retard 3 de telle façon que cette extrémité passe juste à travers la partie cylindrique du trou 5.When assembling a seal, first pass the two strands of the safety wire between the washer 6 and the housing 9, containing the transducer 1 with its contact 2 and the delay line 3, which gives the double fold safety thread. To maintain this assembly in position in the washer, a rivet 7 of annealed aluminum is forced into the slot between the washer 6 and the end 4 of the delay line. This rivet initially has a cylindrical shape and deforms conically during insertion. To reduce the insertion force and thus the thickness of the annular rivet, the largest diameter of the conical part of the end 4 of the delay line 3 is chosen so that this end just passes through the part cylindrical hole 5.

Toute tentative de fraude conduirait à une déformation de l'extrémité 4 de la ligne à retard et donc à une modification de l'identité. Cette même remarque vaut bien sûr aussi, lorsqu'on ouvre volontairement le sceau en usinant la rondelle 6 et le rivet 7 jusqu'à la partie conique de la ligne de retard.Any attempted fraud would lead to a distortion of the end 4 of the delay line and therefore to a change in identity. This same remark also applies, of course, when voluntarily opens the seal by machining the washer 6 and the rivet 7 to the conical part of the delay line.

Par cette opération, le rivet 7 et la rondelle sont détruits et doivent être remplacés.By this operation, the rivet 7 and the washer are destroyed and must be replaced.

Grâce à.la forme irrégulière de la ligne à retard, l'onde émise par le transducteur 1 est réfléchie en divers modes (ondes de surface et ondes transversales), ce qui assure l'unicité d'identité. Dans ces cas pratiques, il suffit d'obtenir quatre à cinq pics dans une dynamique de 10 dB contenus dans une fenêtre temporelle de 10 µs pour définir sans ambiguité une identité. Ces pics dépendent surtout du marquage de la surface extérieure de l'extrémité 4, car les réflexions sur cette surface sont décelées par le transducteur en priorité.Thanks to the irregular shape of the delay line, the wave emitted by the transducer 1 is reflected in various modes (surface waves and transverse waves), which ensures uniqueness of identity. In these practical cases, it suffices to obtain four to five peaks in a dynamic range of 10 dB contained in a time window of 10 µs to unambiguously define an identity. 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.

L'invention n'est pas limitée à l'exemple de réalisation cité- ci-dessus. On peut adapter le sceau dans le cadre de l'invention à une utilisation sans fil de sécurité, dans laquelle la rondelle 6 est partie intégrante de l'objet à protéger. On peut en outre utiliser d'autres matériaux que l'aluminium pour la ligne à retard, l'aluminium recuit pour le rivet 7 et le duralu- minpour le boîtier 9 et la rondelle 6. En particulier, on peut choisir une rondelle en matière isolante, le contact de la masse étant amené au transducteur par le boîtier 9 et le fil de sécurité.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. It is also possible to use other materials than aluminum for the delay line, annealed aluminum for the rivet 7 and duralum for the housing 9 and the washer 6. In particular, one can choose a material washer insulating, the earth contact being brought to the transducer by the housing 9 and the safety wire.

En ce qui concerne l'acquisition de l'identité, on excite le transducteur par une impulsion électrique et on compare ensuite le signal analogique de réponse du transducteur à un signal analogique préétabli. Mieux encore, on extrait de ce signal des caractéristiques numériques qui sont comparées à des caractéristiques préétablies de même type.As regards the acquisition of the identity, the transducer is excited by an electrical pulse and then the analog signal of response of the transducer is compared with a preset analog signal. Better still, we extract from this signal digital characteristics which are compared with preset characteristics of the same type.

Claims (6)

RevendicationsClaims 1/ Sceau à signature ultrasonore comportant une rondelle (6), un transducteur ultrasonore (1) associé axialement à une ligne à retard métallique (3), l'extrémité libre (4) de cette ligne à retard étant apparente dans le trou central (5) de la rondelle et donnant les éléments principaux de l'identité, caractérisé par le fait que ledit trou (5) et ladite extrémité (4) de la ligne à retard (3) ont chacun une forme tronconique telle qu'après l'assemblage il reste une fente circulaire conique de diamètre croissant vers l'extérieur, qui est comblée par un rivet annulaire (7) en métal mou.1 / Ultrasonic signature seal comprising a washer (6), an ultrasonic transducer (1) associated axially with a metallic delay line (3), the free end (4) of this delay line being visible in the central hole ( 5) of the washer and giving the main elements of the identity, characterized in that said hole (5) and said end (4) of the delay line (3) each have a frustoconical shape such that after the assembly there remains a conical circular slot of increasing diameter towards the outside, which is filled by an annular rivet (7) made of soft metal. 2/ Sceau selon la revendication 1, caractérisé par le fait que le transducteur (1) et la ligne à retard (3) sont protégés par un enrobage (8) d'une résine chargée de particules non conductrices et par un boîtier cylindrique (9) entourant cette résine.2 / Seal according to claim 1, characterized in that the transducer (1) and the delay line (3) are protected by a coating (8) of a resin charged with non-conductive particles and by a cylindrical housing (9 ) surrounding this resin. 3/ Sceau selon la revendication 2, caractérisé par le fait que le boîtier (9) comporte deux zones de diamètres extérieurs différents, la zone de diamètre plus faible étant proche de l'extrémité libre (4) de la ligne à retard (3), un fil de sécurité (10) passant entre une bordure de la rondelle (6) et la zone de diamètre plus faible du boîtier.3 / Seal according to claim 2, characterized in that the housing (9) has two zones of different external diameters, the zone of smaller diameter being close to the free end (4) of the delay line (3) , a security wire (10) passing between an edge of the washer (6) and the area of smaller diameter of the housing. 4/ Sceau selon l'une des revendications 1 à 3, caractérisé par le fait que l'extrémité libre (4) de la ligne à retard (3) possède une forme sphérique convexe portant un marquage aléatoire qui donne les éléments principaux de l'identité.4 / Seal according to one of claims 1 to 3, characterized in that the free end (4) of the delay line (3) has a convex spherical shape carrying a random marking which gives the main elements of the identity. 5/ Sceau selon l'une des revendications précédentes, caractérisé par le fait que le trou (5) de la rondelle (6) d'une part et l'extrémité (4) de la ligne à retard (3) d'autre part comportent chacun une zone conique extérieure et une zone cylindrique intérieure, le diamètre de la zone intérieure de la rondelle étant plus faible que le diamètre le plus faible dans la zone conique de la rondelle et n'étant que légèrement supérieur au diamètre le plus grand de la zone conique de la ligne à retard (3).5 / Seal according to one of the preceding claims, characterized in that the hole (5) of the washer (6) on the one hand and the end (4) of the delay line (3) on the other hand feature each an outer conical area and an inner cylindrical area, the diameter of the inner area of the washer being smaller than the smallest diameter in the conical area of the washer and being only slightly greater than the largest diameter of the conical zone of the delay line (3).
EP19820108127 1982-09-03 1982-09-03 Ultrasonic identity seal Expired EP0102405B1 (en)

Priority Applications (2)

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

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EP0102405A1 true EP0102405A1 (en) 1984-03-14
EP0102405B1 EP0102405B1 (en) 1987-01-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570533A1 (en) * 1984-09-18 1986-03-21 Commissariat Energie Atomique ULTRASONIC CABLE SEAL

Citations (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
EP0018198A2 (en) * 1979-04-24 1980-10-29 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

Patent Citations (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
EP0018198A2 (en) * 1979-04-24 1980-10-29 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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570533A1 (en) * 1984-09-18 1986-03-21 Commissariat Energie Atomique ULTRASONIC CABLE SEAL
EP0178970A1 (en) * 1984-09-18 1986-04-23 Commissariat A L'energie Atomique Ultrasonic cable seal
US4673922A (en) * 1984-09-18 1987-06-16 Commissariat A L'energie Automatique Cabled ultrasonic seal

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Publication number Publication date
EP0102405B1 (en) 1987-01-07
DE3275035D1 (en) 1987-02-12

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