EP2395315B1 - Test method and system for an electro-pyrotechnical initiator - Google Patents

Test method and system for an electro-pyrotechnical initiator Download PDF

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Publication number
EP2395315B1
EP2395315B1 EP20110290255 EP11290255A EP2395315B1 EP 2395315 B1 EP2395315 B1 EP 2395315B1 EP 20110290255 EP20110290255 EP 20110290255 EP 11290255 A EP11290255 A EP 11290255A EP 2395315 B1 EP2395315 B1 EP 2395315B1
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Prior art keywords
electro
pyrotechnic initiator
electric current
electromagnetic field
initiator
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German (de)
French (fr)
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EP2395315A1 (en
EP2395315B8 (en
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Maël GODARD
Marc Steinberg
Hervé Huguenin
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MBDA France SAS
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MBDA France SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B35/00—Testing or checking of ammunition
    • 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
    • F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C21/00—Checking fuzes; Testing fuzes

Definitions

  • the present invention relates to a method and a test system for an electro-pyrotechnic initiator.
  • an electro-pyrotechnic initiator comprises a pyrotechnic charge, in particular a pyrotechnic powder, which is initiated by a resistive element placed in contact with this charge.
  • This resistive element may be formed of a filament, in particular a cylindrical filament, which is preferably made of an alloy of high resistivity. The generation of an electric current in the resistive filament causes the heating of the latter by Joule effect, and this heating can trigger the pyrotechnic charge.
  • such an electro-pyrotechnic initiator is applied to a weapon system, including a missile.
  • an electric current can be induced in the resistive filament of the electro-pyrotechnic initiator when the latter is subjected to an electromagnetic field. In certain surrounding circumstances, it may even happen that the electric current induced in the electro-pyrotechnic initiator is such that it triggers the latter. Therefore, when a system, in particular a weapon system, which is equipped with such an electro-pyrotechnic initiator enters an area subjected to significant electromagnetic aggression, generated in particular by radars or by radio sources, these In some cases, electromagnetic aggression may cause an inadvertent tripping of the electro-pyrotechnic initiator and thus of the system in which it is mounted.
  • German patent DE 43 12 043 C1 which is considered to be the closest state of the art of the present invention, describes such a method and an appropriate test system.
  • This conventional method is very efficient for electromagnetic fields having sustained wave forms, because the Electrical currents induced in the electro-pyrotechnic initiator by this type of waveforms are continuous, as is the case for the electric currents taken into account in the calibration step of the test method.
  • the electromagnetic aggressions encountered in the theaters of operations or during specific tests are not always of maintained form, but may especially be of impulse shape, so as to generate non-continuous currents in the electropyrotechnic initiators.
  • the present invention aims to overcome these disadvantages. It relates to a method for testing an electro-pyrotechnic initiator, which makes it possible to carry out tests relating to any type of electromagnetic field to which it may be subjected, and in particular electromagnetic aggressions of non-maintained form.
  • pulses means a uniform and uniform variation in the form of pulses, the duration of which can be determined (or of generation), as well as the duration of recurrence (or appearance), that is, say the frequency.
  • step a) the different values of the pulsed electric current have pulses of holding times and variable recurrence times
  • step b) the electro-pyrotechnic initiator is subjected to an electromagnetic field. having pulsed-shaped electromagnetic waves for determining said variation of the induced electric current.
  • the present invention therefore proposes a new calibration step making it possible to determine the correspondence between the measured heating of an electro-pyrotechnic initiator and a current pulsed electric through the latter, which is at the origin of this heating, the resulting calibration curve can be used to determine in step b) the electric current actually flowing in the electro-pyrotechnic initiator as a function of a measured heating that is generated by electromagnetic aggression of unserviceable form, which can be at the origin of electric currents of this type.
  • said pulsed electric current for supplying the electro-pyrotechnic initiator may be generated by any type of conventional pulsed current generator.
  • a breaking device is arranged at the electrical connection between electrical supply means of the electro-pyrotechnic initiator and said electro-pyrotechnic initiator. power supply, which is likely to cut durations and variable recurrences.
  • the new calibration step can be implemented in a simple and low-cost manner by simply integrating a device for disconnecting the power supply into a conventional test system, as specified below.
  • an electromagnetic field value which generates an induced electric current is determined. having a predetermined value, in particular the value causing the triggering of the electro-pyrotechnic initiator or a value lower than the latter by a predetermined margin.
  • the present invention also relates to a system for testing an electro-pyrotechnic initiator which is capable of being subjected to electromagnetic fields including in particular electromagnetic waves of non-maintained form.
  • said second, third, fifth, and sixth means are part of an optical temperature measurement unit, which simplifies the implementation of tests according to the present invention.
  • the present invention thus makes it possible to know unambiguously, in the field of use considered, the value of the electric current flowing through the resistive filament of the electro-pyrotechnic initiator when the electromagnetic field to which it is subjected is of the pulsed type.
  • the figure 1 is the block diagram of an optical measurement unit that is applied to an electro-pyrotechnic initiator to perform a test according to the invention.
  • the figure 2 is a graph for explaining the characteristics of a test according to the invention.
  • the present invention is applied to an electro-pyrotechnic initiator 1 which is intended to be mounted in a system, and in particular in a weapon system such as a missile for example.
  • An electro-pyrotechnic initiator 1 comprises, in the usual way, a pyrotechnic charge, in particular a pyrotechnic powder, which is initiated by a resistive element placed in contact with this charge.
  • This resistive element is preferably formed of a filament 2, in particular cylindrical, which generally consists of an alloy of high resistivity. The generation of an electric current in the resistive filament 2 causes the latter to heat up by the Joule effect and, from a certain value, this heating triggers the pyrotechnic charge of the initiator 1.
  • the present invention relates to a method and a system 3 for testing such an electro-pyrotechnic initiator 1.
  • This method comprises, in the usual way, a first calibration step, and a second test step.
  • the electro-pyrotechnic 1 is preferably made inert by removing its pyrotechnic charge, in particular a pyrotechnic powder. This makes it possible to avoid triggering the load during calibration and to gain easier access to the filament 2 for performing the optical measurements of the heating.
  • the electro-pyrotechnic initiator 1 is preferably mounted in the system for which it is intended, in particular in a weapon system such as a missile, for example to obtain test conditions as close as possible to the operating conditions.
  • said electro-pyrotechnic initiator 1 is not rendered inert.
  • said means 4 of the test system 3 are formed so as to feed the electro-pyrotechnic initiator 1 with a pulsed electric current.
  • the term "electric current (or electromagnetic field) pulsed" a variation of the electric current (or the electromagnetic field) which is in the form of regular pulses IM uniform over time t, whose retention (or generation) T1 times can be determined, as well as the duration of recurrence T2 (or appearance), as represented on the figure 2 for an electric current i. It can also be irregular pulses, but that we know and that we know how to reproduce. On the example of the figure 2 , the pulses IM have an intensity of value i0.
  • the means 4 in order to carry out said first measurements, the means 4 generate different values of pulsed electric current which have IM pulses of holding times T1 and of variable recurrence periods T2, and at the step of test, to carry out said second measurements, the electro-pyrotechnic initiator 1 is subjected to an electromagnetic field having variable electromagnetic waves also of pulsed shape.
  • the present invention therefore proposes a new calibration step making it possible to determine the correspondence between the measured heating of an electro-pyrotechnic initiator 1 and a pulsating electric current passing through the latter, which is at the origin of this heating.
  • the resulting calibration curve is then used to determine, in the test step, the electrical current actually flowing in the electro-pyrotechnic initiator 1 as a function of a measured temperature rise that is generated by non-electromagnetic electromagnetic aggression. maintained (which can be at the origin of electric currents of this type).
  • test system 3 in accordance with the invention is complete and makes it possible to test an electro-pyrotechnic initiator 1 with respect to all types of electromagnetic aggression, whether they are of maintained shape (using a curve conventional calibration obtained from a continuous electric current) or non-maintained form (using a calibration curve according to the invention, obtained from a pulsed electric current), in the field of identified employment.
  • said pulsed electric current for supplying the electro-pyrotechnic initiator 1 may be generated by any type of conventional pulsed current generator.
  • This preferred embodiment makes it possible to implement the new calibration step in a simple and low-cost way, integrating only a device 14 for cutting off the power supply in a usual test system.
  • said system 3 (and in particular the unit 7) can determine, by means of said variation of the electric current induced in the electro-pyrotechnic initiator 1 as a function of the electromagnetic field, an electromagnetic field value which generates a induced electric current having a predetermined value, in particular the value causing the triggering of the electropyrotechnic initiator 1 or a value lower than the latter by a predetermined margin.
  • the system 3 can also perform tests on different types of initiators 1 or on different variants of the same initiator 1 in order to search for an electro-pyrotechnic initiator 1 which is not triggered by the electromagnetic attacks likely to be encountered in the theaters of operations envisaged or in specific tests envisaged.
  • the method and system 3 in accordance with the invention thus make it possible to know without ambiguity the value of the electric current flowing through the resistive filament 2 of an electro-pyrotechnic initiator 1 when the electromagnetic field to which it is subjected is of the pulsed type.

Description

La présente invention concerne un procédé et un système de test pour un initiateur électro-pyrotechnique.The present invention relates to a method and a test system for an electro-pyrotechnic initiator.

De façon usuelle, un initiateur électro-pyrotechnique comprend une charge pyrotechnique, en particulier une poudre pyrotechnique, qui est initiée par un élément résistif placé au contact de cette charge. Cet élément résistif peut être formé d'un filament, en particulier cylindrique, qui est de préférence constitué d'un alliage de grande résistivité. La génération d'un courant électrique dans le filament résistif provoque l'échauffement de ce dernier par effet Joule, et cet échauffement peut déclencher la charge pyrotechnique.Usually, an electro-pyrotechnic initiator comprises a pyrotechnic charge, in particular a pyrotechnic powder, which is initiated by a resistive element placed in contact with this charge. This resistive element may be formed of a filament, in particular a cylindrical filament, which is preferably made of an alloy of high resistivity. The generation of an electric current in the resistive filament causes the heating of the latter by Joule effect, and this heating can trigger the pyrotechnic charge.

Plus particulièrement, bien que non exclusivement, un tel initiateur électro-pyrotechnique est appliqué à un système d'arme, et notamment à un missile.More particularly, although not exclusively, such an electro-pyrotechnic initiator is applied to a weapon system, including a missile.

On sait qu'un courant électrique peut être induit dans le filament résistif de l'initiateur électro-pyrotechnique lorsque ce dernier est soumis à un champ électromagnétique. Dans certaines circonstances environnantes, il peut même arriver que le courant électrique induit dans l'initiateur électro-pyrotechnique soit tel qu'il provoque le déclenchement de ce dernier. Par conséquent, lorsqu'un système, en particulier un système d'arme, qui est muni d'un tel initiateur électro-pyrotechnique pénètre dans une zone soumise à des agressions électromagnétiques importantes, engendrées notamment par des radars ou par des sources radio, ces agressions électromagnétiques peuvent, dans certains cas, provoquer un déclenchement intempestif de l'initiateur électro-pyrotechnique et donc du système, dans lequel il est monté.It is known that an electric current can be induced in the resistive filament of the electro-pyrotechnic initiator when the latter is subjected to an electromagnetic field. In certain surrounding circumstances, it may even happen that the electric current induced in the electro-pyrotechnic initiator is such that it triggers the latter. Therefore, when a system, in particular a weapon system, which is equipped with such an electro-pyrotechnic initiator enters an area subjected to significant electromagnetic aggression, generated in particular by radars or by radio sources, these In some cases, electromagnetic aggression may cause an inadvertent tripping of the electro-pyrotechnic initiator and thus of the system in which it is mounted.

Aussi, pour éviter un tel déclenchement intempestif, il convient de tester l'initiateur électro-pyrotechnique monté sur le système correspondant pour vérifier si cet ensemble est en mesure de résister aux agressions électromagnétiques susceptibles d'être rencontrées dans les conditions opérationnelles prévues pour ledit système ou s'il convient de le protéger davantage.Also, to avoid such inadvertent tripping, it is necessary to test the electro-pyrotechnic initiator mounted on the corresponding system to verify if this assembly is able to withstand the electromagnetic attacks likely to be encountered in the operating conditions provided for said system or whether to protect it further.

Pour réaliser un tel test, on met en oeuvre, généralement, les opérations suivantes :

  1. a) dans une première étape de calibrage :
    • on alimente l'initiateur électro-pyrotechnique avec un courant électrique continu, qui est réglable en intensité ;
    • on réalise optiquement des premières mesures de l'échauffement provoqué par ce courant électrique dans ledit initiateur électro-pyrotechnique ; et
    • on détermine, à l'aide de ces premières mesures, une courbe de calibrage qui illustre la variation de l'échauffement de l'initiateur électro-pyrotechnique en fonction du courant électrique qui l'alimente ; et
  2. b) dans une seconde étape de test :
    • on soumet l'initiateur électro-pyrotechnique à un champ électromagnétique ;
    • on réalise optiquement des secondes mesures de l'échauffement provoqué par ce champ électromagnétique dans ledit initiateur électro-pyrotechnique ; et
    • on détermine, à l'aide de ces secondes mesures et de ladite courbe de calibrage, la variation du courant électrique induit dans l'initiateur électro-pyrotechnique en fonction du champ électromagnétique, auquel il est soumis.
To carry out such a test, the following operations are generally carried out:
  1. a) in a first calibration step:
    • the electro-pyrotechnic initiator is supplied with a continuous electric current, which is adjustable in intensity;
    • optically taking first measurements of the heating caused by this electric current in said electro-pyrotechnic initiator; and
    • using these first measurements, a calibration curve is determined which illustrates the variation of the heating of the electro-pyrotechnic initiator as a function of the electric current which supplies it; and
  2. b) in a second test step:
    • the electro-pyrotechnic initiator is subjected to an electromagnetic field;
    • second measurements of the heating caused by this electromagnetic field in said electro-pyrotechnic initiator are optically performed; and
    • the variation of the electric current induced in the electro-pyrotechnic initiator as a function of the electromagnetic field to which it is subjected is determined by means of these second measurements and of said calibration curve.

Le brevet allemand DE 43 12 043 C1 , qui est considéré comme le plus proche état de la technique de la présente invention, décrit un tel procédé et un système de test approprié.The German patent DE 43 12 043 C1 , which is considered to be the closest state of the art of the present invention, describes such a method and an appropriate test system.

Ce procédé usuel est très performant pour des champs électromagnétiques présentant des formes d'ondes entretenues, car les courants électriques induits dans l'initiateur électro-pyrotechnique par ce type de formes d'ondes sont continus, comme cela est le cas pour les courants électriques pris en compte dans l'étape de calibrage du procédé de test.This conventional method is very efficient for electromagnetic fields having sustained wave forms, because the Electrical currents induced in the electro-pyrotechnic initiator by this type of waveforms are continuous, as is the case for the electric currents taken into account in the calibration step of the test method.

Toutefois, les agressions électromagnétiques rencontrées sur les théâtres d'opérations ou lors d'essais spécifiques ne sont pas toujours de forme entretenue, mais peuvent notamment être de forme impulsionnelle, de manière à engendrer des courants non continus dans les initiateurs électro-pyrotechniques.However, the electromagnetic aggressions encountered in the theaters of operations or during specific tests are not always of maintained form, but may especially be of impulse shape, so as to generate non-continuous currents in the electropyrotechnic initiators.

Par conséquent, le procédé de test usuel précité n'est pas optimal pour de tels types d'agressions électromagnétiques de forme non entretenue. Ce procédé de test usuel, bien que très performant dans son domaine d'utilisation habituel, n'apparaît pas en mesure de réaliser des tests pour l'ensemble des agressions électromagnétiques qu'un initiateur électro-pyrotechnique est susceptible de rencontrer.Therefore, the above-mentioned conventional testing method is not optimal for such types of electromagnetically unmaintained forms of aggression. This usual test method, although very efficient in its usual field of use, does not appear able to perform tests for all electromagnetic attacks that an electro-pyrotechnic initiator is likely to encounter.

La présente invention a pour objet de remédier à ces inconvénients. Elle concerne un procédé pour tester un initiateur électro-pyrotechnique, qui permet de réaliser des tests relatifs à tout type de champ électromagnétique auquel il peut être soumis, et notamment à des agressions électromagnétiques de forme non entretenue.The present invention aims to overcome these disadvantages. It relates to a method for testing an electro-pyrotechnic initiator, which makes it possible to carry out tests relating to any type of electromagnetic field to which it may be subjected, and in particular electromagnetic aggressions of non-maintained form.

A cet effet, selon l'invention, ledit procédé selon lequel on réalise les opérations suivantes :

  1. a) dans une première étape (de calibrage) :
    • on alimente l'initiateur électro-pyrotechnique avec un courant électrique, et on réalise optiquement une première mesure de l'échauffement provoqué par ce courant électrique dans ledit initiateur électro-pyrotechnique, cette mesure étant répétée pour des valeurs différentes du courant électrique ; et
    • on détermine, à l'aide des premières mesures ainsi obtenues, une courbe de calibrage qui illustre la variation de l'échauffement de l'initiateur électro-pyrotechnique en fonction du courant électrique qui l'alimente ; et b) dans une seconde étape :
    • on soumet l'initiateur électro-pyrotechnique à un champ électromagnétique, et on réalise optiquement une seconde mesure de l'échauffement provoqué par ce champ électromagnétique dans ledit initiateur électro-pyrotechnique, cette mesure étant répétée pour des valeurs différentes du champ électromagnétique ; et
    • on détermine, à l'aide des secondes mesures ainsi obtenues et de ladite courbe de calibrage, la variation du courant électrique induit dans l'initiateur électro-pyrotechnique en fonction du champ électromagnétique, auquel il est soumis,
      est remarquable en ce qu'à l'étape a), pour déterminer ladite courbe de calibrage, on alimente ledit initiateur électro-pyrotechnique avec un courant électrique pulsé.
For this purpose, according to the invention, said method according to which the following operations are carried out:
  1. a) in a first step (calibration):
    • the electro-pyrotechnic initiator is supplied with an electric current, and a first measurement of the heating caused by this electric current in said electro-pyrotechnic initiator is performed optically, this measurement being repeated for different values of the electric current; and
    • a calibration curve is determined with the aid of the first measurements thus obtained, which illustrates the variation of the heating of the electro-pyrotechnic initiator as a function of the electric current which supplies it; and b) in a second step:
    • the electro-pyrotechnic initiator is subjected to an electromagnetic field, and a second measurement of the heating caused by this electromagnetic field in said electro-pyrotechnic initiator is performed optically, this measurement being repeated for different values of the electromagnetic field; and
    • the variation of the electric current induced in the electropyrotechnic initiator as a function of the electromagnetic field to which it is subjected is determined using the second measurements thus obtained and of the calibration curve;
      is remarkable in that in step a), to determine said calibration curve, said electro-pyrotechnic initiator is supplied with a pulsed electric current.

On entend par « pulsé » une variation régulière et uniforme sous forme d'impulsions, dont on peut déterminer les durées de maintien (ou de génération), ainsi que les durées de récurrence (ou d'apparition), c'est-à-dire la fréquence.The term "pulsed" means a uniform and uniform variation in the form of pulses, the duration of which can be determined (or of generation), as well as the duration of recurrence (or appearance), that is, say the frequency.

Avantageusement, à l'étape a), les différentes valeurs du courant électrique pulsé présentent des impulsions de durées de maintien et de durées de récurrence variables, et à l'étape b), on soumet l'initiateur électro-pyrotechnique à un champ électromagnétique présentant des ondes électromagnétiques de forme pulsée pour déterminer ladite la variation du courant électrique induit.Advantageously, in step a), the different values of the pulsed electric current have pulses of holding times and variable recurrence times, and in step b), the electro-pyrotechnic initiator is subjected to an electromagnetic field. having pulsed-shaped electromagnetic waves for determining said variation of the induced electric current.

La présente invention propose, par conséquent, une nouvelle étape de calibrage permettant de déterminer la correspondance entre l'échauffement mesuré d'un initiateur électro-pyrotechnique et un courant électrique pulsé traversant ce dernier, qui est à l'origine de cet échauffement, la courbe de calibrage qui en résulte pouvant être utilisée pour déterminer à l'étape b) le courant électrique circulant réellement dans l'initiateur électro-pyrotechnique en fonction d'un échauffement mesuré qui est généré par des agressions électromagnétiques de forme non entretenue, pouvant être à l'origine de courants électriques de ce type.The present invention therefore proposes a new calibration step making it possible to determine the correspondence between the measured heating of an electro-pyrotechnic initiator and a current pulsed electric through the latter, which is at the origin of this heating, the resulting calibration curve can be used to determine in step b) the electric current actually flowing in the electro-pyrotechnic initiator as a function of a measured heating that is generated by electromagnetic aggression of unserviceable form, which can be at the origin of electric currents of this type.

Ainsi, grâce à l'invention, on obtient un procédé de test complet permettant de tester l'initiateur électro-pyrotechnique par rapport à tous types d'agressions électromagnétiques, de forme entretenue (à l'aide de la méthode de calibrage usuelle) ou de forme non entretenue (à l'aide de la nouvelle méthode de calibrage conforme à l'invention).Thus, thanks to the invention, there is obtained a complete test method for testing the electro-pyrotechnic initiator with respect to all types of electromagnetic aggression, of maintained form (using the usual calibration method) or of non-maintained form (using the new calibration method according to the invention).

Dans le cadre de la présente invention, ledit courant électrique pulsé destiné à alimenter l'initiateur électro-pyrotechnique peut être engendré par tout type de générateur usuel de courant pulsé. Toutefois, dans un mode de réalisation préféré, pour générer ledit courant électrique pulsé, on agence, au niveau de la liaison électrique entre des moyens d'alimentation électrique de l'initiateur électro-pyrotechnique et ledit initiateur électro-pyrotechnique, un dispositif de coupure de l'alimentation électrique, qui est susceptible de réaliser des coupures de durées et de récurrences variables.In the context of the present invention, said pulsed electric current for supplying the electro-pyrotechnic initiator may be generated by any type of conventional pulsed current generator. However, in a preferred embodiment, in order to generate said pulsed electric current, a breaking device is arranged at the electrical connection between electrical supply means of the electro-pyrotechnic initiator and said electro-pyrotechnic initiator. power supply, which is likely to cut durations and variable recurrences.

Ainsi, on peut mettre en oeuvre la nouvelle étape de calibrage de façon simple et à coût réduit, en intégrant simplement un dispositif de coupure de l'alimentation électrique dans un système de test usuel, comme précisé ci-dessous.Thus, the new calibration step can be implemented in a simple and low-cost manner by simply integrating a device for disconnecting the power supply into a conventional test system, as specified below.

Par ailleurs, avantageusement, à une étape c) supplémentaire, on détermine, à l'aide de ladite variation du courant électrique induit dans l'initiateur électro-pyrotechnique en fonction du champ électromagnétique, une valeur de champ électromagnétique qui engendre un courant électrique induit présentant une valeur prédéterminée, notamment la valeur provoquant le déclenchement de l'initiateur électro-pyrotechnique ou une valeur inférieure à cette dernière d'une marge prédéterminée.Furthermore, advantageously, in a further step c), using said variation of the electric current induced in the electro-pyrotechnic initiator as a function of the electromagnetic field, an electromagnetic field value which generates an induced electric current is determined. having a predetermined value, in particular the value causing the triggering of the electro-pyrotechnic initiator or a value lower than the latter by a predetermined margin.

Ainsi, on peut connaître la valeur du champ électromagnétique, à partir de laquelle le courant électrique induit risque de provoquer un déclenchement de l'initiateur électro-pyrotechnique. Cette information peut être utilisée, en particulier, pour s'assurer que cet initiateur électro-pyrotechnique puisse être employé sur les théâtres d'opérations ou lors d'essais spécifiques, envisagés.Thus, one can know the value of the electromagnetic field, from which the induced electric current may cause a triggering of the electro-pyrotechnic initiator. This information can be used, in particular, to ensure that this electro-pyrotechnic initiator can be used in the theaters of operations or during specific tests, envisaged.

La présente invention concerne également un système pour tester un initiateur électro-pyrotechnique qui est susceptible d'être soumis à des champs électromagnétiques comprenant notamment des ondes électromagnétiques de forme non entretenue.The present invention also relates to a system for testing an electro-pyrotechnic initiator which is capable of being subjected to electromagnetic fields including in particular electromagnetic waves of non-maintained form.

Selon l'invention, ledit système de test, du type comportant :

  • des premiers moyens pour alimenter l'initiateur électro-pyrotechnique avec un courant électrique ;
  • des deuxièmes moyens pour réaliser optiquement des premières mesures de l'échauffement provoqué par ce courant électrique dans ledit initiateur électro-pyrotechnique, ces mesures étant répétées pour des valeurs différentes du courant électrique ;
  • des troisièmes moyens pour déterminer, à l'aide de ces premières mesures, une courbe de calibrage qui illustre la variation de l'échauffement de l'initiateur électro-pyrotechnique en fonction du courant électrique qui l'alimente ;
  • des quatrièmes moyens pour soumettre l'initiateur électro-pyrotechnique à un champ électromagnétique ;
  • des cinquièmes moyens pour réaliser optiquement des secondes mesures de l'échauffement provoqué par ce champ électromagnétique dans ledit initiateur électro-pyrotechnique, ces mesures étant répétées pour des valeurs différentes du champ électromagnétique ; et
  • des sixièmes moyens pour déterminer, à l'aide de ces secondes mesures et de ladite courbe de calibrage, la variation du courant électrique induit dans l'initiateur électro-pyrotechnique en fonction du champ électromagnétique, auquel il est soumis, est remarquable en ce que lesdits premiers moyens sont formés de manière à alimenter l'initiateur électro-pyrotechnique avec un courant électrique pulsé.
According to the invention, said test system, of the type comprising:
  • first means for supplying the electro-pyrotechnic initiator with an electric current;
  • second means for optically making first measurements of the heating caused by this electric current in said electro-pyrotechnic initiator, these measurements being repeated for different values of the electric current;
  • third means for determining, using these first measurements, a calibration curve which illustrates the variation of the heating of the electro-pyrotechnic initiator as a function of the electric current which supplies it;
  • fourth means for subjecting the electro-pyrotechnic initiator to an electromagnetic field;
  • fifth means for optically performing second measurements of the heating caused by this electromagnetic field in said electro-pyrotechnic initiator, these measurements being repeated for different values of the electromagnetic field; and
  • sixth means for determining, with the aid of these second measurements and of said calibration curve, the variation of the electric current induced in the electro-pyrotechnic initiator as a function of the electromagnetic field to which it is subjected, is remarkable in that said first means are formed to supply the electro-pyrotechnic initiator with a pulsed electric current.

Dans un mode de réalisation préféré, qui est simplifié, lesdits premiers moyens comprennent :

  • des moyens d'alimentation électrique dudit initiateur électro-pyrotechnique ; et
  • un dispositif de coupure de l'alimentation électrique susceptible de réaliser des coupures de durées et de récurrences variables, qui est agencé au niveau de la liaison électrique entre lesdits moyens d'alimentation électrique et ledit initiateur électro-pyrotechnique.
In a preferred embodiment, which is simplified, said first means comprise:
  • power supply means of said electro-pyrotechnic initiator; and
  • a device for disconnecting the electrical power supply capable of making interruptions of variable durations and recurrences, which is arranged at the level of the electrical connection between said power supply means and said electro-pyrotechnic initiator.

En outre, avantageusement, lesdits deuxièmes, troisièmes, cinquièmes, et sixièmes moyens font partie d'une unité de mesure optique de la température, ce qui permet de simplifier la mise en oeuvre des tests conformes à la présente invention.In addition, advantageously, said second, third, fifth, and sixth means are part of an optical temperature measurement unit, which simplifies the implementation of tests according to the present invention.

La présente invention permet donc de connaître sans ambiguïté, dans le domaine d'emploi considéré, la valeur du courant électrique traversant le filament résistif de l'initiateur électro-pyrotechnique lorsque le champ électromagnétique auquel il est soumis est de type pulsé.The present invention thus makes it possible to know unambiguously, in the field of use considered, the value of the electric current flowing through the resistive filament of the electro-pyrotechnic initiator when the electromagnetic field to which it is subjected is of the pulsed type.

Elle permet également, comme précisé ci-dessous :

  • de connaître le domaine d'emploi du système de test ; et
  • d'améliorer les techniques de collage d'une fibre optique de l'unité de mesure optique sur le filament résistif de l'initiateur électro-pyrotechnique.
It also allows, as specified below:
  • to know the field of use of the test system; and
  • to improve the techniques for bonding an optical fiber of the optical measurement unit to the resistive filament of the electro-pyrotechnic initiator.

Les figures du dessin annexé feront bien comprendre comment l'invention peut être réalisée. Sur ces figures, des références identiques désignent des éléments semblables.The figures of the appended drawing will make it clear how the invention can be realized. In these figures, identical references designate similar elements.

La figure 1 est le schéma synoptique d'une unité de mesure optique qui est appliquée à un initiateur électro-pyrotechnique pour réaliser un test conforme à l'invention.The figure 1 is the block diagram of an optical measurement unit that is applied to an electro-pyrotechnic initiator to perform a test according to the invention.

La figure 2 est un graphique permettant d'expliquer les caractéristiques d'un test conforme à l'invention.The figure 2 is a graph for explaining the characteristics of a test according to the invention.

La présente invention est appliquée à un initiateur électro-pyrotechnique 1 qui est destiné à être monté dans un système, et notamment dans un système d'arme tel qu'un missile par exemple.The present invention is applied to an electro-pyrotechnic initiator 1 which is intended to be mounted in a system, and in particular in a weapon system such as a missile for example.

Un initiateur électro-pyrotechnique 1 comprend, de façon usuelle, une charge pyrotechnique, en particulier une poudre pyrotechnique, qui est initiée par un élément résistif placé au contact de cette charge. Cet élément résistif est, de préférence, formé d'un filament 2, en particulier cylindrique, qui est généralement constitué d'un alliage de grande résistivité. La génération d'un courant électrique dans le filament résistif 2 provoque l'échauffement de ce dernier par effet Joule et, à partir d'une certaine valeur, cet échauffement déclenche la charge pyrotechnique de l'initiateur 1.An electro-pyrotechnic initiator 1 comprises, in the usual way, a pyrotechnic charge, in particular a pyrotechnic powder, which is initiated by a resistive element placed in contact with this charge. This resistive element is preferably formed of a filament 2, in particular cylindrical, which generally consists of an alloy of high resistivity. The generation of an electric current in the resistive filament 2 causes the latter to heat up by the Joule effect and, from a certain value, this heating triggers the pyrotechnic charge of the initiator 1.

La présente invention concerne un procédé et un système 3 pour tester un tel initiateur électro-pyrotechnique 1.The present invention relates to a method and a system 3 for testing such an electro-pyrotechnic initiator 1.

Ce procédé comporte, de façon usuelle, une première étape de calibrage, et une seconde étape de test.This method comprises, in the usual way, a first calibration step, and a second test step.

Pour mettre en oeuvre l'étape de calibrage, ledit système 3 comporte, comme représenté sur la figure 1 :

  • des moyens 4 pour alimenter l'initiateur électro-pyrotechnique 1 avec un courant électrique ;
  • des moyens 5 pour réaliser optiquement des premières mesures de l'échauffement provoqué par ce courant électrique dans ledit initiateur électro-pyrotechnique 1, ces mesures étant répétées pour des valeurs différentes du courant électrique ; et
  • des moyens pour 6 déterminer, à l'aide de ces premières mesures, une courbe de calibrage qui illustre la variation de l'échauffement de l'initiateur électro-pyrotechnique 1 en fonction du courant électrique qui l'alimente.
To implement the calibration step, said system 3 comprises, as shown in FIG. figure 1 :
  • means 4 for supplying the electro-pyrotechnic initiator 1 with an electric current;
  • means 5 for optically making first measurements of the heating caused by this electric current in said electro-pyrotechnic initiator 1, these measurements being repeated for different values of the electric current; and
  • means for determining, with the aid of these first measurements, a calibration curve which illustrates the variation in the heating of the electro-pyrotechnic initiator 1 as a function of the electric current which supplies it.

Pour mettre en oeuvre cette étape de calibrage, on rend de préférence inerte ledit électro-pyrotechnique 1, en lui retirant sa charge pyrotechnique, en particulier une poudre pyrotechnique. Ceci permet d'éviter un déclenchement de la charge lors du calibrage et d'accéder plus facilement au filament 2 pour réaliser les mesures optiques de l'échauffement.To carry out this calibration step, the electro-pyrotechnic 1 is preferably made inert by removing its pyrotechnic charge, in particular a pyrotechnic powder. This makes it possible to avoid triggering the load during calibration and to gain easier access to the filament 2 for performing the optical measurements of the heating.

Dans un mode de réalisation préféré, lesdits moyens 5 et 6 font partie d'une unité 7 de mesure optique de la température. Une telle unité 7 de mesure optique présente, notamment, l'avantage d'être insensible aux agressions électromagnétiques et de ne pas rendre le système globalement sensible aux champs électriques. Ladite unité 7 comporte :

  • une fibre optique 8 équipée d'un interféromètre, dont une extrémité 8A est collée sur le filament 2, dont on désire mesurer la température ;
  • une unité d'analyse 9 qui réalise notamment le traitement des mesures réalisées ; et
  • une interface homme/machine 10, par exemple un ordinateur portable, qui est reliée par une liaison 11 à ladite unité d'analyse 9 et qui comporte un écran 12 pour afficher les résultats des mesures.
In a preferred embodiment, said means 5 and 6 are part of a unit 7 for optical measurement of the temperature. Such an optical measurement unit 7 has, in particular, the advantage of being insensitive to electromagnetic aggression and not to make the system generally sensitive to electric fields. Said unit 7 comprises:
  • an optical fiber 8 equipped with an interferometer, one end 8A is bonded to the filament 2, the temperature of which it is desired to measure;
  • an analysis unit 9 which performs in particular the processing of the measurements made; and
  • a man / machine interface 10, for example a laptop computer, which is connected by a link 11 to said analysis unit 9 and which comprises a screen 12 for displaying the results of the measurements.

Par ailleurs, pour mettre en oeuvre l'étape suivante de test qui est de préférence réalisée dans une chambre anéchoïque ou réverbérante, ledit système 3 comporte :

  • des moyens usuels (non représentés) pour soumettre l'initiateur électro-pyrotechnique 1 à un champ électromagnétique ; et
  • des moyens, de préférence ladite unité 7 de mesure optique de la température ou une unité similaire, pour :
  • réaliser optiquement des secondes mesures de l'échauffement provoqué par ce champ électromagnétique dans ledit initiateur électro-pyrotechnique 1, ces mesures étant répétées pour des valeurs différentes du champ électromagnétique ; et
  • déterminer, à l'aide de ces secondes mesures et de ladite courbe de calibrage, la variation du courant électrique induit dans l'initiateur électro-pyrotechnique 1 en fonction du champ électromagnétique, auquel il est soumis.
Moreover, to implement the next test step which is preferably performed in an anechoic or reverberant chamber, said system 3 comprises:
  • conventional means (not shown) for subjecting the electro-pyrotechnic initiator 1 to an electromagnetic field; and
  • means, preferably said optical temperature measuring unit 7 or a similar unit, for:
  • optically perform second measurements of the heating caused by this electromagnetic field in said electro-pyrotechnic initiator 1, these measurements being repeated for different values of the electromagnetic field; and
  • with the aid of these second measurements and of said calibration curve, determining the variation of the electric current induced in the electro-pyrotechnic initiator 1 as a function of the electromagnetic field to which it is subjected.

Pour mettre en oeuvre cette seconde étape (de test), on monte, de préférence, ledit initiateur électro-pyrotechnique 1, dans le système auquel il est destiné, notamment dans un système d'arme tel qu'un missile par exemple, de manière à obtenir des conditions de test le plus proche possible des conditions opérationnelles. De plus, dans cette seconde étape, ledit initiateur électro-pyrotechnique 1 n'est pas rendu inerte.To implement this second (test) step, the electro-pyrotechnic initiator 1 is preferably mounted in the system for which it is intended, in particular in a weapon system such as a missile, for example to obtain test conditions as close as possible to the operating conditions. In addition, in this second step, said electro-pyrotechnic initiator 1 is not rendered inert.

Selon l'invention, lesdits moyens 4 du système de test 3 sont formés de manière à alimenter l'initiateur électro-pyrotechnique 1 avec un courant électrique pulsé.According to the invention, said means 4 of the test system 3 are formed so as to feed the electro-pyrotechnic initiator 1 with a pulsed electric current.

Dans le cadre de la présente invention, on entend par « courant électrique (ou champ électromagnétique) pulsé » une variation du courant électrique (ou du champ électromagnétique) qui se présente sous forme d'impulsions IM régulières et uniformes au cours du temps t, dont on peut déterminer les durées T1 de maintien (ou de génération), ainsi que les durées de récurrence T2 (ou d'apparition), comme représenté sur la figure 2 pour un courant électrique i. Il peut également s'agir d'impulsions irrégulières, mais que l'on connaît et que l'on sait reproduire. Sur l'exemple de la figure 2, les impulsions IM présentent une intensité de valeur iO.In the context of the present invention, the term "electric current (or electromagnetic field) pulsed" a variation of the electric current (or the electromagnetic field) which is in the form of regular pulses IM uniform over time t, whose retention (or generation) T1 times can be determined, as well as the duration of recurrence T2 (or appearance), as represented on the figure 2 for an electric current i. It can also be irregular pulses, but that we know and that we know how to reproduce. On the example of the figure 2 , the pulses IM have an intensity of value i0.

Par conséquent, à l'étape de calibrage, pour réaliser lesdites premières mesures, les moyens 4 engendrent différentes valeurs de courant électrique pulsé qui présentent des impulsions IM de durées de maintien T1 et de durées de récurrence T2 variables, et à l'étape de test, pour réaliser lesdites secondes mesures, on soumet l'initiateur électro-pyrotechnique 1 à un champ électromagnétique présentant des ondes électromagnétiques variables également de forme pulsée.Therefore, in the calibration step, in order to carry out said first measurements, the means 4 generate different values of pulsed electric current which have IM pulses of holding times T1 and of variable recurrence periods T2, and at the step of test, to carry out said second measurements, the electro-pyrotechnic initiator 1 is subjected to an electromagnetic field having variable electromagnetic waves also of pulsed shape.

La présente invention propose, par conséquent, une nouvelle étape de calibrage permettant de déterminer la correspondance entre l'échauffement mesuré d'un initiateur électro-pyrotechnique 1 et un courant électrique pulsé traversant ce dernier, qui est à l'origine de cet échauffement. La courbe de calibrage qui en résulte est ensuite utilisée pour déterminer, à l'étape de test, le courant électrique circulant réellement dans l'initiateur électro-pyrotechnique 1 en fonction d'un échauffement mesuré qui est généré par des agressions électromagnétiques de forme non entretenue (pouvant être à l'origine de courants électriques de ce type).The present invention therefore proposes a new calibration step making it possible to determine the correspondence between the measured heating of an electro-pyrotechnic initiator 1 and a pulsating electric current passing through the latter, which is at the origin of this heating. The resulting calibration curve is then used to determine, in the test step, the electrical current actually flowing in the electro-pyrotechnic initiator 1 as a function of a measured temperature rise that is generated by non-electromagnetic electromagnetic aggression. maintained (which can be at the origin of electric currents of this type).

Ainsi, le système de test 3 conforme à l'invention est complet et permet de tester un initiateur électro-pyrotechnique 1 par rapport à tous types d'agressions électromagnétiques, qu'elles soient de forme entretenue (à l'aide d'une courbe de calibrage usuelle obtenue à partir d'un courant électrique continu) ou de forme non entretenue (à l'aide d'une courbe de calibrage conforme à l'invention, obtenue à partir d'un courant électrique pulsé), dans le domaine d'emploi identifié.Thus, the test system 3 in accordance with the invention is complete and makes it possible to test an electro-pyrotechnic initiator 1 with respect to all types of electromagnetic aggression, whether they are of maintained shape (using a curve conventional calibration obtained from a continuous electric current) or non-maintained form (using a calibration curve according to the invention, obtained from a pulsed electric current), in the field of identified employment.

Dans le cadre de la présente invention, ledit courant électrique pulsé destiné à alimenter l'initiateur électro-pyrotechnique 1 peut être engendré par tout type de générateur usuel de courant pulsé.In the context of the present invention, said pulsed electric current for supplying the electro-pyrotechnic initiator 1 may be generated by any type of conventional pulsed current generator.

Toutefois, dans un mode de réalisation préféré, lesdits moyens 4 comprennent :

  • des moyens 13 usuels d'alimentation électrique de l'initiateur électro-pyrotechnique 1 ; et
  • un dispositif 14 de coupure de l'alimentation électrique qui est susceptible de réaliser des coupures de durées et de récurrences variables. Ce dispositif 14 est agencé sur une liaison électrique 15 entre lesdits moyens 13 d'alimentation électrique et ledit initiateur électro-pyrotechnique 1.
However, in a preferred embodiment, said means 4 comprise:
  • common means 13 for supplying electricity to the electro-pyrotechnic initiator 1; and
  • a device 14 for disconnecting the power supply which is capable of making breaks of durations and variable recurrences. This device 14 is arranged on an electrical connection 15 between said power supply means 13 and said electro-pyrotechnic initiator 1.

Ce mode de réalisation préféré permet de mettre en oeuvre la nouvelle étape de calibrage de façon simple et à coût réduit, en intégrant uniquement un dispositif 14 de coupure de l'alimentation électrique dans un système de test usuel.This preferred embodiment makes it possible to implement the new calibration step in a simple and low-cost way, integrating only a device 14 for cutting off the power supply in a usual test system.

Par ailleurs, ledit système 3 (et notamment l'unité 7) peut déterminer, à l'aide de ladite variation du courant électrique induit dans l'initiateur électro-pyrotechnique 1 en fonction du champ électromagnétique, une valeur de champ électromagnétique qui engendre un courant électrique induit présentant une valeur prédéterminée, notamment la valeur provoquant le déclenchement de l'initiateur électro-pyrotechnique 1 ou une valeur inférieure à cette dernière d'une marge prédéterminée.Moreover, said system 3 (and in particular the unit 7) can determine, by means of said variation of the electric current induced in the electro-pyrotechnic initiator 1 as a function of the electromagnetic field, an electromagnetic field value which generates a induced electric current having a predetermined value, in particular the value causing the triggering of the electropyrotechnic initiator 1 or a value lower than the latter by a predetermined margin.

Ainsi, on peut connaître la valeur du champ électromagnétique, à partir de laquelle le courant électrique induit risque de provoquer un déclenchement intempestif de l'initiateur électro-pyrotechnique 1. Cette information peut être utilisée, en particulier, pour renforcer le système muni dudit initiateur électro-pyrotechnique 1 lorsqu'il est susceptible d'être soumis à des agressions électromagnétiques aptes à présenter au moins une telle valeur.Thus, it is possible to know the value of the electromagnetic field, from which the induced electric current may cause an inadvertent tripping of the electro-pyrotechnic initiator 1. This information may be used, in particular, to reinforce the system provided with said initiator electro-pyrotechnic 1 when it is likely to be subjected to electromagnetic aggression capable of presenting at least one such value.

Le système 3 peut également réaliser des tests sur différents types d'initiateurs 1 ou sur différentes variantes de réalisation d'un même initiateur 1 dans le but de rechercher un initiateur électro-pyrotechnique 1 qui n'est pas déclenché par les agressions électromagnétiques susceptibles d'être rencontrées sur les théâtres d'opérations envisagés ou lors d'essais spécifiques envisagés.The system 3 can also perform tests on different types of initiators 1 or on different variants of the same initiator 1 in order to search for an electro-pyrotechnic initiator 1 which is not triggered by the electromagnetic attacks likely to be encountered in the theaters of operations envisaged or in specific tests envisaged.

Le procédé et le système 3 conformes à l'invention permettent donc de connaître sans ambiguïté la valeur du courant électrique traversant le filament résistif 2 d'un initiateur électro-pyrotechnique 1 lorsque le champ électromagnétique auquel il est soumis est de type pulsé.The method and system 3 in accordance with the invention thus make it possible to know without ambiguity the value of the electric current flowing through the resistive filament 2 of an electro-pyrotechnic initiator 1 when the electromagnetic field to which it is subjected is of the pulsed type.

Ils permettent également :

  • de connaître le domaine d'emploi du système de test 3, en définissant à partir de tests les types d'agressions électromagnétiques que ledit système de test 3 est en mesure de détecter. On peut en particulier définir les fréquences limites des agressions électromagnétiques susceptibles d'être mesurées par ledit système de test 3; et
  • d'améliorer les techniques de collage de la fibre optique 8 de l'unité de mesure optique 7 sur le filament résistif 2 de l'initiateur électro-pyrotechnique 1. En particulier, les coefficients thermiques des matériaux utilisés vont influer sur les mesures réalisées. On peut ainsi rechercher des types de collage permettant d'augmenter la résolution des mesures.
They also allow:
  • to know the field of use of the test system 3, by defining from the tests the types of electromagnetic attacks that said test system 3 is able to detect. In particular, it is possible to define the limiting frequencies of the electromagnetic aggressions that can be measured by said test system 3; and
  • to improve the bonding techniques of the optical fiber 8 of the optical measurement unit 7 on the resistive filament 2 of the electro-pyrotechnic initiator 1. In particular, the thermal coefficients of the materials used will influence the measurements made. It is thus possible to look for types of gluing that make it possible to increase the resolution of the measurements.

Claims (8)

  1. Test method for an electro-pyrotechnic initiator subjected to an electromagnetic field, method in which the following operations are carried out:
    a) in a first step:
    - the electro-pyrotechnic initiator (1) is supplied with an electric current, and a first measurement of the heating caused by this electric current in said electro-pyrotechnic initiator (1) is carried out optically, this measurement being repeated for various electric current values; and
    - on the basis of the first measurements obtained in this way, a calibration curve is determined that shows the fluctuation in the heating of the electro-pyrotechnic initiator (1) according to the electric current supplied thereto; and
    b) in a second step:
    - the electro-pyrotechnic initiator (1) is subjected to an electromagnetic field, and a second measurement of the heating caused by this electromagnetic field in said electro-pyrotechnic initiator (1) is carried out optically, this measurement being repeated for various electromagnetic field values; and
    - on the basis of the second measurements obtained in this way and of said calibration curve, the fluctuation in the electric current induced in the electro-pyrotechnic initiator (1) is determined according to the electromagnetic field to which it is subjected;
    characterised in that in step a), in order to determine said calibration curve, said electro-pyrotechnic initiator (1) is supplied with a pulsed electric current.
  2. Method according to claim 1, characterised in that in step a) the various pulsed electric current values have pulses of variable dwell times (T1) and repetition times (T2).
  3. Method according to either claim 1 or claim 2, characterised in that in step b) the electro-pyrotechnic initiator (1) is subjected to an electromagnetic field having pulsed electromagnetic waves to determine said fluctuation in the induced electric current.
  4. Method according to any of claims 1 to 3, characterised in that, in order to generate said pulsed electric current, a device (14) for cutting off the power supply, capable of carrying out cut-offs of variable duration and repetition, is arranged at the electrical connection (15) between means (13) for powering the electro-pyrotechnic initiator (1) and said electro-pyrotechnic initiator (1).
  5. Method according to any of claims 1 to 4, characterised in that in an additional step c) an electromagnetic field value that generates an induced electric current having a predetermined value is determined on the basis of said fluctuation in the electric current induced in the electro-pyrotechnic initiator (1) according to the electric field.
  6. System for testing an electro-pyrotechnic initiator subjected to an electromagnetic field, said system (3) comprising:
    - first means (4) for supplying the electro-pyrotechnic initiator (1) with an electric current;
    - second means (5) for optically carrying out first measurements of the heating caused by this electric current in said electro-pyrotechnic initiator (1), these measurements being repeated for various electric current values;
    - third means (6) for determining, on the basis of these first measurements, a calibration curve that shows the fluctuation in the heating of the electro-pyrotechnic initiator (1) according to the electric current supplied thereto;
    - fourth means for subjecting the electro-pyrotechnic initiator (1) to an electromagnetic field;
    - fifth means (5) for optically carrying out second measurements of the heating caused by this electromagnetic field in said electro-pyrotechnic initiator (1), these measurements being repeated for various electromagnetic field values; and
    - sixth means (6) for determining, on the basis of these second measurements and of said calibration curve, the fluctuation in the electric current induced in the electro-pyrotechnic initiator (1) according to the electromagnetic field to which it is subjected;
    characterised in that said first means (4) are formed in such a way as to supply the electro-pyrotechnic initiator (1) with a pulsed electric current.
  7. System according to claim 6, characterised in that said first means (4) comprise:
    - means (13) for powering the electro-pyrotechnic initiator (1); and
    - a device (14) for cutting off the power supply which is capable of carrying out cut-offs of variable duration and repetition and which is arranged at an electrical connection (15) between said power supply means (13) and said electro-pyrotechnic initiator (1).
  8. System according to either claim 6 or claim 7, characterised in that said second, third, fifth and sixth means belong to an optical temperature measurement unit (7).
EP20110290255 2010-06-14 2011-06-06 Test method and system for an electro-pyrotechnical initiator Not-in-force EP2395315B8 (en)

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US3518542A (en) * 1968-03-18 1970-06-30 Us Army Bridgewire current detector
US3667040A (en) * 1970-09-28 1972-05-30 Us Army Sensor for detecting radio frequency currents in carbon bridge detonator
DE3711421A1 (en) * 1987-04-04 1988-10-20 Messerschmitt Boelkow Blohm Test equipment
DE4312043C1 (en) * 1993-04-13 1994-02-03 Deutsche Aerospace Electronic circuit for igniting electrical explosion device - has heating measurement and test device, thermic sensor and high frequency filter

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EP2395315A1 (en) 2011-12-14
FR2961313A1 (en) 2011-12-16
FR2961313B1 (en) 2012-07-27
EP2395315B8 (en) 2015-01-28

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