EP1067356A1 - Optical igniter using a graded index glass rod lens - Google Patents

Optical igniter using a graded index glass rod lens Download PDF

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Publication number
EP1067356A1
EP1067356A1 EP00401935A EP00401935A EP1067356A1 EP 1067356 A1 EP1067356 A1 EP 1067356A1 EP 00401935 A EP00401935 A EP 00401935A EP 00401935 A EP00401935 A EP 00401935A EP 1067356 A1 EP1067356 A1 EP 1067356A1
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EP
European Patent Office
Prior art keywords
optical
connector
surrounds
glass
optical fiber
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Granted
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EP00401935A
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German (de)
French (fr)
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EP1067356B1 (en
Inventor
Henry Moulard
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Institut Franco Allemand de Recherches de Saint Louis ISL
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Institut Franco Allemand de Recherches de Saint Louis ISL
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/113—Initiators therefor activated by optical means, e.g. laser, flashlight

Definitions

  • the present invention relates to an igniter optics comprising a pyrotechnic composition of which ignition is achieved by laser radiation which is brought to this pyrotechnic composition by an optical fiber.
  • one of the ends of the optical fiber is connected to a laser radiation source and the other end of this fiber is engaged in a connector.
  • This type of optical igniter also includes means for ensuring a removable mechanical connection between the fiber optic connector and the pyrotechnic composition.
  • the object of the present invention is to overcome the above difficulties, by creating an optical igniter both simple to make and to assemble, inexpensive, which saves energy and whose functioning is perfectly reliable.
  • the invention thus relates to an optical igniter comprising a pyrotechnic composition and a fiber one end of which is connected to a source of laser radiation, the other end adjacent to the pyrotechnic composition being engaged in a connector, means ensuring a mechanical connection removable between the fiber optic connector and the pyrotechnic composition.
  • this optical igniter is characterized in that between the connector and the pyrotechnic composition is inserted a glass rod whose axis is aligned along the axis of the optical fiber and that of the pyrotechnic composition, this bar in glass having an index gradient and consisting of one or two coaxial parts in contact with the composition pyrotechnic and with the end of the optical fiber, so that the laser radiation from said end of the optical fiber crosses the bar in glass and focuses on the face of the glass rod contact with the pyrotechnic composition.
  • the insertion of the aforementioned glass bar between the optical fiber and the pyrotechnic composition ensures perfect transmission of laser energy to this pyrotechnic composition, which guarantees a perfectly reliable operation of the igniter.
  • the gradient glass bar index is engaged in a bore in a element of thermally non-conductive material.
  • This material may be made of metal which is not very thermally conductive, which excludes copper and aluminum.
  • the above item can also be ceramic.
  • the element in slightly thermally conductive material is shaped cylindrical or frustoconical.
  • the optical igniter comprises a composition pyrotechnics 1 and an optical fiber 2 including one end is connected to a radiation source laser such as a laser diode.
  • connection ring 3a The other end of fiber optic 2 adjacent to the pyrotechnic composition 1 is engaged in a connector 3 carried by a connection ring 3a.
  • Means which will be detailed later provide a removable mechanical connection between the fiber optic connector 2 and composition pyrotechnics 1.
  • This bore 5 contains a glass rod 6 to index gradient one side of which is in contact with the pyrotechnic composition 1.
  • the opposite side of the bar glass 6 is intended, after mounting to come in contact with the end 2a of the optical fiber 2.
  • laser radiation 7 (see figure 2) from the end 2a of the optical fiber 2 cross the glass rod 6 and focuses on the face 6d of the glass rod 6 in contact with the composition pyrotechnics 1.
  • Element 4 made of non-conductive material thermally can be made of non-conductive metal thermally, such as stainless steel. Metals such that copper and aluminum cannot agree.
  • Element 4 made of non-conductive material thermally can also be ceramic.
  • element 4 in slightly thermally conductive material is shaped cylindrical.
  • cylinder 4 is housed in a cylindrical cavity 8 formed in the metallic envelope 9 which surrounds the composition pyrotechnic 1.
  • a tip 11 is screwed into a bore threaded 9a of the casing 9, so that the end piece presses hermetically cylinder 4 against composition pyrotechnics 1.
  • the diameter of the gradient glass rod 6 index can vary between 1 and 2 mm approximately.
  • the length of the gradient glass rod index is of the order of 5 mm.
  • This length is such that the radiation laser 7 from optical fiber 2 can focus on its end.
  • the ratio of the length of the glass rod 6 on its diameter corresponds to the characteristic half-step optics of gradient index glass.
  • the cylinder 4 which carries the bar 6 is housed in a cylindrical cavity 8a formed in the metal tip 11a which surrounds the connector 3 of the optical fiber (2) after screwing in the metallic envelope 9 which surrounds the composition pyrotechnics 1.
  • the bar 6 made of gradient index glass is housed in a bore 5a made in the metal tip 11b which after mounting surrounds the connector 3 of the optical fiber 2 and which is screwed into the metal casing 9 which surrounds the pyrotechnic composition 1.
  • the bar in Gradient index glass is in two parts.
  • a first part 6a of the gradient glass bar index is housed in a bore 5b made in a metal tip 11c which after mounting surrounds the connector 3 of the optical fiber 2 and which is screwed into the metallic envelope 9 which surrounds the composition pyrotechnics 1.
  • a second part 6b of the bar in glass is housed in a bore in an element 12 attached to the end of the fiber connector 3 optics 2.
  • Figure 6 shows the arrangement of the two bar parts 6a, 6b, after screwing on the ring 3a on tip 11c.
  • the ratio of the length to the diameter of each part 6a, 6b of the glass rod corresponds to the quarter characteristic optical step of the gradient index glass.
  • Figure 6 also illustrates the path of the laser radiation in the two parts 6a, 6b of Gradient index bar.
  • the laser radiation focuses on the end of the pyrotechnic composition 1.
  • FIG. 6 shows that a space d exists between the two bar parts 6a, 6b. This distance d can vary from one igniter to another, which thus makes it possible to compensate for manufacturing tolerances and to save manufacturing and assembly costs.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

The optical ignite for a pyrotechnic has a fibre optic (2). Between the connector (3) and fibre optic is an insulating insert (4). The insert has an orifice (5) aligned with a fibre optic. The orifice has a glass bar (6) with one end of the fibre optic is positioned to project a laser beam through the bar onto the pyrotechnic.

Description

La présente invention concerne un allumeur optique comprenant une composition pyrotechnique dont l'allumage est réalisé au moyen d'un rayonnement laser qui est amené vers cette composition pyrotechnique par une fibre optique.The present invention relates to an igniter optics comprising a pyrotechnic composition of which ignition is achieved by laser radiation which is brought to this pyrotechnic composition by an optical fiber.

Dans ce type d'allumeur optique l'une des extrémités de la fibre optique est raccordée à une source de rayonnement laser et l'autre extrémité de cette fibre est engagée dans un connecteur.In this type of optical igniter one of the ends of the optical fiber is connected to a laser radiation source and the other end of this fiber is engaged in a connector.

Ce type d'allumeur optique comporte également des moyens pour assurer une liaison mécanique amovible entre le connecteur de la fibre optique et la composition pyrotechnique.This type of optical igniter also includes means for ensuring a removable mechanical connection between the fiber optic connector and the pyrotechnic composition.

Un tel allumeur optique a été décrit dans un article publié en 1997 dans la revue « EG & G Opto-electronics » et intitulé « Commercialization of a laser ignited actuator ».Such an optical igniter has been described in a article published in 1997 in the journal “EG & G Opto-electronics "And entitled" Commercialization of a laser ignited actuator ".

Dans la pratique, la réalisation d'un tel allumeur optique présente de nombreuses difficultés pour obtenir une parfaite transmission du rayonnement laser, sans perte d'énergie, entre la fibre optique et la composition pyrotechnique.In practice, the realization of such optical igniter presents many difficulties for obtain perfect transmission of laser radiation, without loss of energy, between optical fiber and pyrotechnic composition.

Le but de la présente invention est de surmonter les difficultés ci-dessus, en créant un allumeur optique à la fois simple à réaliser et à monter, peu coûteux, qui économise l'énergie et dont le fonctionnement est parfaitement fiable.The object of the present invention is to overcome the above difficulties, by creating an optical igniter both simple to make and to assemble, inexpensive, which saves energy and whose functioning is perfectly reliable.

L'invention vise ainsi un allumeur optique comprenant une composition pyrotechnique et une fibre optique dont une extrémité est raccordée à une source de rayonnement laser, l'autre extrémité adjacente à la composition pyrotechnique étant engagée dans un connecteur, des moyens assurant une liaison mécanique amovible entre le connecteur de la fibre optique et la composition pyrotechnique.The invention thus relates to an optical igniter comprising a pyrotechnic composition and a fiber one end of which is connected to a source of laser radiation, the other end adjacent to the pyrotechnic composition being engaged in a connector, means ensuring a mechanical connection removable between the fiber optic connector and the pyrotechnic composition.

Suivant l'invention, cet allumeur optique est caractérisé en ce qu'entre le connecteur et la composition pyrotechnique est inséré un barreau en verre dont l'axe est aligné suivant l'axe de la fibre optique et celui de la composition pyrotechnique, ce barreau en verre étant à gradient d'indice et constitué d'une ou deux parties coaxiales en contact avec la composition pyrotechnique et avec l'extrémité de la fibre optique, de telle sorte que le rayonnement laser issu de ladite extrémité de la fibre optique traverse le barreau en verre et se focalise sur la face du barreau en verre en contact avec la composition pyrotechnique.According to the invention, this optical igniter is characterized in that between the connector and the pyrotechnic composition is inserted a glass rod whose axis is aligned along the axis of the optical fiber and that of the pyrotechnic composition, this bar in glass having an index gradient and consisting of one or two coaxial parts in contact with the composition pyrotechnic and with the end of the optical fiber, so that the laser radiation from said end of the optical fiber crosses the bar in glass and focuses on the face of the glass rod contact with the pyrotechnic composition.

Etant donné que la réalisation d'un tel allumeur ne pose pas de problème d'alignement très précis entre la fibre optique et le barreau en verre à gradient d'indice, sa fabrication peut être effectuée à faible coût avec les moyens techniques usuels.Since the realization of such an igniter does not pose a very precise alignment problem between fiber optics and the gradient glass bar index, its manufacture can be carried out at low cost with the usual technical means.

De plus, l'insertion du barreau en verre précité entre la fibre optique et la composition pyrotechnique, assure une transmission parfaite de l'énergie laser vers cette composition pyrotechnique, ce qui garantit une parfaitement fiabilité du fonctionnement de l'allumeur.In addition, the insertion of the aforementioned glass bar between the optical fiber and the pyrotechnic composition, ensures perfect transmission of laser energy to this pyrotechnic composition, which guarantees a perfectly reliable operation of the igniter.

De préférence, le barreau en verre à gradient d'indice est engagé dans un alésage pratiqué dans un élément en matière peu conductrice thermiquement. Cette matière peut être en métal peu conducteur thermiquement, ce qui exclut le cuivre et l'aluminium. L'élément ci-dessus peut également être en céramique.Preferably, the gradient glass bar index is engaged in a bore in a element of thermally non-conductive material. This material may be made of metal which is not very thermally conductive, which excludes copper and aluminum. The above item can also be ceramic.

Selon une version de l'invention l'élément en matière peu conductrice thermiquement est de forme cylindrique ou tronconique.According to a version of the invention, the element in slightly thermally conductive material is shaped cylindrical or frustoconical.

D'autres particularités et avantages de l'invention apparaítront encore dans la description ci-après. Other features and advantages of the invention will appear further in the description below.

Aux dessins annexés, donnés à titre d'exemples non limitatifs :

  • la figure 1 est une vue en coupe longitudinale de l'allumeur optique selon l'invention ;
  • la figure 2 est une vue à échelle agrandie du barreau en verre à gradient d'indice ;
  • la figure 3 est une vue analogue à la figure 1, montrant une deuxième version de l'allumeur selon l'invention ;
  • la figure 4 est une vue analogue à la figure 1, montrant une troisième version de l'allumeur selon l'invention ;
  • la figure 5 est une vue analogue à la figure 1, montrant une quatrième version de l'allumeur selon l'invention ;
  • la figure 6 est une vue à échelle agrandie du barreau en verre en deux parties de l'allumeur représenté sur la figure 5.
In the appended drawings, given by way of nonlimiting examples:
  • Figure 1 is a longitudinal sectional view of the optical igniter according to the invention;
  • Figure 2 is an enlarged view of the glass rod index gradient;
  • Figure 3 is a view similar to Figure 1 showing a second version of the igniter according to the invention;
  • Figure 4 is a view similar to Figure 1 showing a third version of the igniter according to the invention;
  • Figure 5 is a view similar to Figure 1 showing a fourth version of the igniter according to the invention;
  • FIG. 6 is an enlarged view of the two-part glass rod of the igniter shown in FIG. 5.

Dans la réalisation représentée sur la figure 1, l'allumeur optique comprend une composition pyrotechnique 1 et une fibre optique 2 dont une extrémité est raccordée à une source de rayonnement laser telle qu'une diode laser.In the embodiment shown in FIG. 1, the optical igniter comprises a composition pyrotechnics 1 and an optical fiber 2 including one end is connected to a radiation source laser such as a laser diode.

L'autre extrémité de la fibre optique 2 adjacente à la composition pyrotechnique 1 est engagée dans un connecteur 3 porté par une bague de connexion 3a.The other end of fiber optic 2 adjacent to the pyrotechnic composition 1 is engaged in a connector 3 carried by a connection ring 3a.

Des moyens qui seront détaillés plus loin assurent une liaison mécanique amovible entre le connecteur 3 de la fibre optique 2 et la composition pyrotechnique 1.Means which will be detailed later provide a removable mechanical connection between the fiber optic connector 2 and composition pyrotechnics 1.

Dans l'exemple de la figure 1, entre le connecteur 3 et la composition pyrotechnique 1 est inséré un élément 4 en une matière peu conductrice thermiquement comportant un alésage 5 dont l'axe est aligné suivant l'axe de la fibre optique 2. In the example in Figure 1, between the connector 3 and the pyrotechnic composition 1 is inserted an element 4 in a slightly conductive material thermally comprising a bore 5 whose axis is aligned along the axis of the optical fiber 2.

Cet alésage 5 renferme un barreau en verre 6 à gradient d'indice dont une face est en contact avec la composition pyrotechnique 1. La face opposée du barreau en verre 6 est destinée, après montage à venir en contact avec l'extrémité 2a de la fibre optique 2.This bore 5 contains a glass rod 6 to index gradient one side of which is in contact with the pyrotechnic composition 1. The opposite side of the bar glass 6 is intended, after mounting to come in contact with the end 2a of the optical fiber 2.

Du fait que le barreau 6 soit en verre à gradient d'indice, le rayonnement laser 7 (voir figure 2) issu de l'extrémité 2a de la fibre optique 2 traverse le barreau en verre 6 et se focalise sur la face 6d du barreau en verre 6 en contact avec la composition pyrotechnique 1.Because the bar 6 is made of glass index gradient, laser radiation 7 (see figure 2) from the end 2a of the optical fiber 2 cross the glass rod 6 and focuses on the face 6d of the glass rod 6 in contact with the composition pyrotechnics 1.

L'élément 4 en matière peu conductrice thermiquement peut être en métal peu conducteur thermiquement, tel que de l'acier inox. Les métaux tels que le cuivre et l'aluminium ne peuvent convenir.Element 4 made of non-conductive material thermally can be made of non-conductive metal thermally, such as stainless steel. Metals such that copper and aluminum cannot agree.

L'élément 4 en matière peu conductrice thermiquement peut également être en céramique.Element 4 made of non-conductive material thermally can also be ceramic.

Dans l'exemple représenté, l'élément 4 en matière peu conductrice thermiquement est de forme cylindrique.In the example shown, element 4 in slightly thermally conductive material is shaped cylindrical.

Comme montré par la figure 1, le cylindre 4 est logé dans une cavité cylindrique 8 formée dans l'enveloppe métallique 9 qui entoure la composition pyrotechnique 1. Un embout 11 est vissé dans un alésage fileté 9a de l'enveloppe 9, de façon que l'embout appuie hermétiquement le cylindre 4 contre la composition pyrotechnique 1.As shown in Figure 1, cylinder 4 is housed in a cylindrical cavity 8 formed in the metallic envelope 9 which surrounds the composition pyrotechnic 1. A tip 11 is screwed into a bore threaded 9a of the casing 9, so that the end piece presses hermetically cylinder 4 against composition pyrotechnics 1.

Le diamètre du barreau en verre 6 à gradient d'indice peut varier entre 1 et 2 mm environ.The diameter of the gradient glass rod 6 index can vary between 1 and 2 mm approximately.

La longueur du barreau en verre à gradient d'indice est de l'ordre de 5 mm.The length of the gradient glass rod index is of the order of 5 mm.

Cette longueur est telle que le rayonnement laser 7 issu de la fibre optique 2 puisse se focaliser à son extrémité. This length is such that the radiation laser 7 from optical fiber 2 can focus on its end.

Le rapport de la longueur du barreau en verre 6 sur son diamètre correspond au demi-pas caractéristique optique du verre à gradient d'indice.The ratio of the length of the glass rod 6 on its diameter corresponds to the characteristic half-step optics of gradient index glass.

Dans l'exemple de la figure 3, le cylindre 4 qui porte le barreau 6 est logé dans une cavité cylindrique 8a formée dans l'embout métallique 11a qui entoure le connecteur 3 de la fibre optique (2) après son vissage dans l'enveloppe métallique 9 qui entoure la composition pyrotechnique 1.In the example of Figure 3, the cylinder 4 which carries the bar 6 is housed in a cylindrical cavity 8a formed in the metal tip 11a which surrounds the connector 3 of the optical fiber (2) after screwing in the metallic envelope 9 which surrounds the composition pyrotechnics 1.

Dans la version selon la figure 4, le barreau 6 en verre à gradient d'indice est logé dans un alésage 5a pratiqué dans l'embout métallique 11b qui après montage entoure le connecteur 3 de la fibre optique 2 et qui est vissé dans l'enveloppe métallique 9 qui entoure la composition pyrotechnique 1.In the version according to FIG. 4, the bar 6 made of gradient index glass is housed in a bore 5a made in the metal tip 11b which after mounting surrounds the connector 3 of the optical fiber 2 and which is screwed into the metal casing 9 which surrounds the pyrotechnic composition 1.

Dans l'exemple de la figure 5, le barreau en verre à gradient d'indice est en deux parties. Une première partie 6a du barreau en verre à gradient d'indice est logée dans un alésage 5b pratiqué dans un embout métallique 11c qui après montage entoure le connecteur 3 de la fibre optique 2 et qui est vissé dans l'enveloppe métallique 9 qui entoure la composition pyrotechnique 1. Une seconde partie 6b du barreau en verre est logée dans un alésage pratiqué dans un élément 12 fixé à l'extrémité du connecteur 3 de la fibre optique 2.In the example in Figure 5, the bar in Gradient index glass is in two parts. A first part 6a of the gradient glass bar index is housed in a bore 5b made in a metal tip 11c which after mounting surrounds the connector 3 of the optical fiber 2 and which is screwed into the metallic envelope 9 which surrounds the composition pyrotechnics 1. A second part 6b of the bar in glass is housed in a bore in an element 12 attached to the end of the fiber connector 3 optics 2.

La figure 6 montre la disposition des deux parties de barreau 6a, 6b, après vissage de la bague 3a sur l'embout 11c.Figure 6 shows the arrangement of the two bar parts 6a, 6b, after screwing on the ring 3a on tip 11c.

Dans ce cas, le rapport de la longueur sur le diamètre de chaque partie 6a, 6b du barreau en verre correspond au quart de pas caractéristique optique du verre à gradient d'indice.In this case, the ratio of the length to the diameter of each part 6a, 6b of the glass rod corresponds to the quarter characteristic optical step of the gradient index glass.

La figure 6 illustre également le trajet du rayonnement laser dans les deux parties 6a, 6b de barreau à gradient d'indice. Figure 6 also illustrates the path of the laser radiation in the two parts 6a, 6b of Gradient index bar.

Comme dans le cas d'un barreau d'une seule pièce, le rayonnement laser focalise sur l'extrémité de la composition pyrotechnique 1.As in the case of a single bar piece, the laser radiation focuses on the end of the pyrotechnic composition 1.

La figure 6 montre qu'un espace d existe entre les deux parties de barreau 6a, 6b. Cette distance d peut varier d'un allumeur à l'autre, ce qui permet ainsi de compenser les tolérances de fabrication et d'économiser les coûts de fabrication et de montage.FIG. 6 shows that a space d exists between the two bar parts 6a, 6b. This distance d can vary from one igniter to another, which thus makes it possible to compensate for manufacturing tolerances and to save manufacturing and assembly costs.

L'allumeur optique que l'on vient de décrire présente les principaux avantages suivants :

  • le barreau en verre 6 à gradient d'indice permet une transmission du rayonnement laser 7 pratiquement sans perte d'énergie (inférieure à 5%) ce qui permet l'utilisation d'une source laser de faible puissance, de l'ordre de 1W, telle qu'une diode laser ;
  • le fait que le barreau en verre 6 soit porté par un élément facilement usinable, facilite le montage du barreau en verre dans l'allumeur et son alignement par rapport à la fibre optique et résout également le problème de l'étanchéité de l'intérieur de l'allumeur par rapport au milieu extérieur.
The main advantages of the optical igniter just described:
  • the glass rod 6 with an index gradient allows a transmission of the laser radiation 7 practically without loss of energy (less than 5%) which allows the use of a low power laser source, of the order of 1W , such as a laser diode;
  • the fact that the glass rod 6 is carried by an easily machinable element, facilitates the mounting of the glass rod in the igniter and its alignment with respect to the optical fiber and also solves the problem of sealing the interior of the igniter in relation to the outside environment.

Bien entendu, l'invention n'est pas limitée à l'exemple que l'on vient de décrire et on peut apporter à celui-ci de nombreuses modifications sans sortir du cadre de l'invention.Of course, the invention is not limited to the example that we just described and we can bring to this one many modifications without leaving the part of the invention.

Claims (11)

Allumeur optique comprenant une composition pyrotechnique (1) et une fibre optique (2) dont une extrémité est raccordée à une source de rayonnement laser, l'autre extrémité étant engagée dans un connecteur (3), des moyens assurant une liaison mécanique amovible entre le connecteur (3) de la fibre optique (2) et la composition pyrotechnique (1), caractérisé en ce qu'entre le connecteur (3) et la composition pyrotechnique (1) est inséré un barreau en verre (6, 6a, 6b) dont l'axe est aligné suivant l'axe de la fibre optique (2), ce barreau étant en verre à gradient d'indice et constitué d'une ou deux parties (6a, 6b) coaxiales en contact d'une part avec la composition pyrotechnique (1) et d'autre part avec l'extrémité de la fibre optique (2), de telle sorte que le rayonnement laser issu de ladite extrémité de la fibre optique (2) traverse le barreau en verre (6, 6a, 6b) et se focalise sur la face du barreau en verre en contact avec la composition pyrotechnique (1).Optical igniter comprising a composition pyrotechnic (1) and an optical fiber (2) including one end is connected to a radiation source laser, the other end being engaged in a connector (3), means ensuring a connection mechanical removable between the fiber connector (3) optics (2) and the pyrotechnic composition (1), characterized in that between the connector (3) and the pyrotechnic composition (1) is inserted a bar in glass (6, 6a, 6b) whose axis is aligned along the axis of the optical fiber (2), this bar being made of glass index gradient consisting of one or two parts (6a, 6b) coaxial on the one hand in contact with the pyrotechnic composition (1) and on the other hand with the end of the optical fiber (2), so that laser radiation from said end of the optical fiber (2) passes through the glass rod (6, 6a, 6b) and focuses on the face of the glass rod in contact with the pyrotechnic composition (1). Allumeur optique conforme à la revendication 1, caractérisé en ce que le barreau en verre (6, 6a, 6b) à gradient d'indice est engagé dans un alésage (5, 5a, 5b) pratiqué dans un élément (4, 11a, 11b, 11c) en une matière peu conductrice thermiquement.Optical igniter according to claim 1, characterized in that the glass rod (6, 6a, 6b) with index gradient is engaged in a bore (5, 5a, 5b) practiced in an element (4, 11a, 11b, 11c) in one material with low thermal conductivity. Allumeur optique conforme à l'une des revendications 1 ou 2, caractérisé en ce que ledit élément (4) en matière peu conductrice thermiquement est en métal peu conducteur thermiquement. Optical igniter according to one of the claims 1 or 2, characterized in that said element (4) of thermally non-conductive material is made of heat-conductive metal. Allumeur optique conforme à la revendication 2, caractérisé en ce que ledit élément (4) en matière peu conductrice thermiquement est en céramique.Optical igniter according to claim 2, characterized in that said element (4) in material not very thermally conductive is ceramic. Allumeur optique conforme à l'une des revendications 1 à 4, caractérisé en ce que ledit élément (4) en matière peu conductrice thermiquement est de forme cylindrique.Optical igniter according to one of the claims 1 to 4, characterized in that said element (4) of thermally non-conductive material is cylindrical in shape. Allumeur optique conforme à la revendication 5, caractérisé en ce que ledit cylindre (4) est logé dans une cavité cylindrique (8) formée dans une enveloppe métallique (9) qui entoure la composition pyrotechnique (1), un embout (11) qui entoure le connecteur (3) de la fibre optique (2), et qui est vissé dans un alésage fileté du premier embout (9), prenant appui sur la face du cylindre (4) opposée à la composition pyrotechnique.Optical igniter according to claim 5, characterized in that said cylinder (4) is housed in a cylindrical cavity (8) formed in a metallic envelope (9) which surrounds the composition pyrotechnic (1), a tip (11) which surrounds the connector (3) of the optical fiber (2), and which is screwed in a threaded bore of the first end piece (9), taking support on the face of the cylinder (4) opposite the pyrotechnic composition. Allumeur optique conforme à l'une des revendications 1 à 5, caractérisé en ce que ledit cylindre (4) est logé dans une cavité cylindrique (8a) formée dans un embout métallique (11a) qui entoure le connecteur (3) de la fibre optique (2) et qui est vissé dans une enveloppe métallique (9) qui entoure = la composition pyrotechnique (1).Optical igniter according to one of the claims 1 to 5, characterized in that said cylinder (4) is housed in a cylindrical cavity (8a) formed in a metal tip (11a) which surrounds the connector (3) of the optical fiber (2) and which is screwed in a metal envelope (9) which surrounds = the pyrotechnic composition (1). Allumeur optique conforme à l'une des revendications 1 à 4, caractérisé en ce que le barreau (6) en verre à gradient d'indice est logé dans un alésage (5a) pratiqué dans un embout métallique (11b), qui entoure le connecteur (3) de la fibre optique (2) et qui est vissé dans un embout métallique (9) qui entoure la composition pyrotechnique (1). Optical igniter according to one of the Claims 1 to 4, characterized in that the bar (6) Gradient index glass is housed in a bore (5a) formed in a metal tip (11b), which surrounds the connector (3) of the optical fiber (2) and which is screwed into a metal end piece (9) which surrounds the pyrotechnic composition (1). Allumeur optique conforme à l'une des revendications 1 à 4, caractérisé en ce qu'une première partie (6a) du barreau en verre à gradient d'indice est logée dans un alésage (5b) pratiqué dans un embout métallique (11c) qui entoure le connecteur (3) de la fibre optique (2) et qui est vissé dans une enveloppe métallique (9) qui entoure la composition pyrotechnique (1), une seconde partie (6b) du barreau en verre étant logée dans un alésage pratiqué dans un élément (12) fixé à l'extrémité du connecteur (3) de la fibre optique (2).Optical igniter according to one of the Claims 1 to 4, characterized in that a first part (6a) of the graded index glass rod is housed in a bore (5b) made in a nozzle metal (11c) which surrounds the connector (3) of the fiber optic (2) and which is screwed into an envelope metallic (9) which surrounds the pyrotechnic composition (1), a second part (6b) of the glass rod being housed in a bore in a fixed element (12) at the end of the connector (3) of the optical fiber (2). Allumeur optique conforme à l'une des revendications 1 à 8, caractérisé en ce que dans le cas où le barreau en verre (6) est d'une seule partie, le rapport de sa longueur sur son diamètre correspond au demi-pas caractéristique optique dudit verre à gradient d'indice.Optical igniter according to one of the Claims 1 to 8, characterized in that in the case where the glass rod (6) is in one piece, the ratio of its length to its diameter corresponds to optical characteristic half-step of said gradient glass index. Allumeur optique conforme à la revendication 9, caractérisé en ce que le rapport de la longueur sur le diamètre de chaque partie (6a, 6b) du barreau en verre correspond au quart de pas caractéristique optique dudit verre à gradient d'indice.Optical igniter according to claim 9, characterized in that the ratio of the length to the diameter of each part (6a, 6b) of the bar in lens corresponds to the quarter characteristic optical step of said index gradient glass.
EP00401935A 1999-07-06 2000-07-05 Optical igniter using a graded index glass rod lens Expired - Lifetime EP1067356B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9908717A FR2796166B1 (en) 1999-07-06 1999-07-06 GLASS BAR INDEX WITH GRADIENT INDEX
FR9908717 1999-07-06

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EP1067356A1 true EP1067356A1 (en) 2001-01-10
EP1067356B1 EP1067356B1 (en) 2004-06-09

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US (1) US6539868B1 (en)
EP (1) EP1067356B1 (en)
DE (1) DE60011347T2 (en)
FR (1) FR2796166B1 (en)

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EP2386819A1 (en) 2010-05-10 2011-11-16 Institut Franco-Allemand de Recherches de Saint-Louis Firing device for an initiator
CN111121545A (en) * 2019-12-10 2020-05-08 南京理工大学 Optical fiber type laser igniter and ignition system

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US7478594B1 (en) * 2006-10-23 2009-01-20 The United States Of America As Represented By The Secretary Of The Army Laser primer
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CN104166187B (en) * 2013-05-17 2016-05-18 中航光电科技股份有限公司 The explosion-proof type laser ignition joints of optical fibre
CN104166186B (en) * 2013-05-17 2016-08-31 中航光电科技股份有限公司 The laser ignition joints of optical fibre
CN104570231A (en) * 2014-12-11 2015-04-29 中航光电科技股份有限公司 Optical fiber connector socket resisting to explosive shock
RU2592014C2 (en) * 2014-12-12 2016-07-20 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") Laser initiation means
RU2601845C2 (en) * 2015-04-08 2016-11-10 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" Device for initiation of explosive charges

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CN111121545A (en) * 2019-12-10 2020-05-08 南京理工大学 Optical fiber type laser igniter and ignition system

Also Published As

Publication number Publication date
FR2796166A1 (en) 2001-01-12
DE60011347T2 (en) 2004-10-07
DE60011347D1 (en) 2004-07-15
US6539868B1 (en) 2003-04-01
EP1067356B1 (en) 2004-06-09
FR2796166B1 (en) 2003-05-30

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