EP0289184B1 - Détonateur activable par le faisceau d'un laser - Google Patents

Détonateur activable par le faisceau d'un laser Download PDF

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Publication number
EP0289184B1
EP0289184B1 EP19880303457 EP88303457A EP0289184B1 EP 0289184 B1 EP0289184 B1 EP 0289184B1 EP 19880303457 EP19880303457 EP 19880303457 EP 88303457 A EP88303457 A EP 88303457A EP 0289184 B1 EP0289184 B1 EP 0289184B1
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EP
European Patent Office
Prior art keywords
explosive
laser beam
charged
chamber
detonable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19880303457
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German (de)
English (en)
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EP0289184A1 (fr
Inventor
Yoji Tasaki
Koichi Kurokawa
Katsuhide Hattori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kajima Corp
NOF Corp
Original Assignee
Kajima Corp
Nippon Oil and Fats Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP10674487A external-priority patent/JPS63273799A/ja
Priority claimed from JP10674587A external-priority patent/JPS63273800A/ja
Application filed by Kajima Corp, Nippon Oil and Fats Co Ltd filed Critical Kajima Corp
Publication of EP0289184A1 publication Critical patent/EP0289184A1/fr
Application granted granted Critical
Publication of EP0289184B1 publication Critical patent/EP0289184B1/fr
Expired legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C7/00—Non-electric detonators; Blasting caps; Primers
    • 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 a laser beam-detonable blasting cap having an improved detonability, wherein a specifically limited explosive is used, and further the structure of the chamber to be charged with the explosive, the loading density of the explosive and the restraining condition for the chamber are specifically limited.
  • ruby laser YAG (yttrium-aluminum-garnet) laser and the like.
  • US-A-3620166 discloses a radiant energy signal transmission system for the operation of a work function at a work station located remotely from the source of the radiant signal.
  • the system was graphite or other black material added to either a mixture of boron and red lead, boron and barium chromate or the like as a polytechnic material sensitive to a luminous energy signal.
  • US-A-3258910 discloses a method of igniting a rocket motor using a laser in combination with fiber optics.
  • US-A-3724383 discloses a laser stimulated ordnance initiation device which uses fiber optics and a spherical glass focusing head to distribute the light pulse, and a low energy laser to initiate the explosive material, potassium hexanitrodiphenylamine a secondary explosive, is initiated to low order detonation which in turn sets off pentaerythrital tetranitrate, also a secondary explosive, to give a high order detonation.
  • This laser beam-detonable blasting cap 40 comprises a vacant space 49, a first chamber 41 defined by a plate 48, and a second chamber 42, wherein an optical fiber 43 is connected through a lens 45 to the top of the explosive 46 arranged in the first chamber 41, both the chambers 41 and 42, the plate 48, the vacant space 49, the lens 45 and the optical fiber 43 are surrounded with a restraining wall 47, the end of the optical fiber 45 is tightly closed by means of a plug 44, the explosives 46 and 50 charged in the first chamber 41 and second chamber 42, respectively, in the form of a multilayered structure are secondary explosives, and the loading density of an explosive charged in the upper portion is higher than that of an explosive charged in the lower portion in each chamber, and both the chambers are same in the average loading density of the explosives charged therein.
  • the numeral 51 represents a bottom plate of the blasting cap 40.
  • the above described laser beam-detonable blasting cap has the following drawbacks.
  • a secondary explosive is charged alone in the first chamber at the portion contacting with an optical fiber, and therefore a laser beam irradiated to the explosive through the optical fiber is substantially wholly reflected, and hence the laser beam is not able to be effectively absorbed in the explosive.
  • the loading density of an explosive charged in the upper portion is higher than that of an explosive charged in the lower portion in each chamber, and therefore the explosives charged in the first chamber are low in the ignition sensitivity by the laser beam.
  • the restraining wall is arranged so as to surround not only the first chamber but also the second chamber, and therefore when the explosives in the second chamber are detonated, the power of the explosives in the second chamber is concentrated to the bottom of the second chamber, and the explosives are poor in the ability for initiating an explosive, which has been charged in the cartridge case at the portion contacting with the restraining wall.
  • the object of the present invention is to eliminate the above described drawbacks and to provide a laser beam-detonable blasting cap having a specifically limited structure, which cap can absorb effectively the laser beam, and can be ignited easily and detonated surely, and hence can initiate completely an explosive charged in a cartridge case.
  • the present invention provides a laser beam-detonable blasting cap, wherein an optical fiber is contacted with the upper portion of a multilayerly arranged explosive and a restraining wall is arranged on the side of the explosive, characterised by comprising:
  • a laser beam-detonable blasting cap 1 comprises a shell 2 having a bottom plate 3 and containing a secondary explosive 4, which has been charged in the upper portion of the shell 2 and contains a laser beam-absorbing material, and a secondary explosive 5 charged in the lower portion of the shell 2.
  • a restraining wall 6 is arranged inside of the shell 2 so as to surround the side of the explosive 4 charged in the upper portion of the shell 2, and a plug 7 having an optical fiber 8 penetrating through its center portion is arranged on the upper side of the explosive 4 so as to cover the explosive 4. That is, the plug 7 is fitted into the upper end portion of the shell 2 while maintaining the state, wherein an optical fiber 8 is penetrated through the center portion of the plug 7, whereby the opening at the end of the optical fiber 8 is directly contacted with the explosive 4.
  • the explosive to be used in the laser beam-detonable blasting cap according to the present invention there can be used secondary explosives, such as PETN (pentaerythritol tetranitrate), tetryl (trinitrophenylmethylnitramine), RDX (trimethylene-trinitramine), HMX (cyclotetramethylene-tetranitramine) and the like.
  • PETN penentaerythritol tetranitrate
  • tetryl trinitrophenylmethylnitramine
  • RDX trimethylene-trinitramine
  • HMX cyclotetramethylene-tetranitramine
  • a secondary explosive containing 0.5-10% by weight of a laser beam-absorbing material, such as carbonaceous black material, for example carbon black, graphite or the like, or a dyestuff having an absorption band in the wavelength of laser beam, for example black dyestuff (for example, Direct Fast Black B, sold by Sumitomo Chemical Co.) or the like, in order to absorb efficiently the laser beam.
  • a laser beam-absorbing material such as carbonaceous black material, for example carbon black, graphite or the like
  • a dyestuff having an absorption band in the wavelength of laser beam for example black dyestuff (for example, Direct Fast Black B, sold by Sumitomo Chemical Co.) or the like, in order to absorb efficiently the laser beam.
  • the secondary explosive for example, when PETN is used, is charged into the laser beam-detonable blasting cap in a loading density within the range of 0.8-1.7.
  • the loading density of the explosive 4 charged into the upper portion should be generally within the range of 0.8-1.4, and preferably within the range of 0.8-1.2.
  • the loading density of the explosive 5 charged into the lower portion should be generally within the range of 1-1.7, and preferably within the range of 1.2-1.7.
  • the loading density of the explosive 4 charged in the upper portion should be low in order that the explosive 4 has a high ignition sensitivity by the laser beam, can continue easily its combustion after ignition, can be easily changed from combustion to deflagration and can be easily changed from deflagration to detonation. Further, it is necessary that the loading density of the explosive 5 charged in the lower portion should be high in order that the explosive 5 can be completely detonated by the detonation wave of the explosive 4 charged in the upper portion, and the explosive 5 exhibits a high explosion power enough to initiate completely an explosive, in which the laser beam-detonable blasting cap according to the present invention has been set.
  • the restraining wall 6 is made of metals, such as iron, stainless steel, aluminum and the like, having a high tensile strength, or is made of reinforced plastics having the same tensile strength as that of these metals.
  • the thickness of the restraining wall 6 is determined depending upon the inner diameter of the upper chamber and the kind of the material to be used in the restraining wall. When the chamber has an inner diameter of 6 mm, and a restraining wall is made of iron, the use of a restraining wall having a thickness of at least 0.1 mm can attain the object of the present invention, but a restraining wall having a thickness of 1-2 mm is generally used.
  • This restraining wall 6 is used in order to maintain the gas pressure generated by the ignition and combustion of an explosive 4 charged in the upper portion. Accordingly, the length of the restraining wall 6 must be such that the wall 6 covers at least the side of the explosive 4 charged in the upper portion. Further, not only the side of the explosive 4 charged in the upper portion, but also the side of an explosive 5 charged in the lower portion may be covered with the restraining wall 6. However, in this case, the explosive 5 charged in the lower portion is poor in the ability for initiating an explosive charged in a cartridge case at the portion contacted with the side of the explosive 5 as compared with the case, wherein the restraining wall 6 does not cover the side of the explosive 5.
  • the shell 2 is used as a vessel for receiving explosives 4 and 5 charged therein, and the material and the thickness of the shell 2 can be freely selected insofar as that the shell is not deformed by the pressure generated during the charging of the explosives.
  • the material of the shell 2 there can be used iron, copper, aluminum, reinforced plastic material and the like.
  • the optical fiber 8 may be directly contacted with the secondary explosive 4 containing a laser beam-absorbing material or may be indirectly contacted with the explosive 4 containing the laser beam-absorbing material through a lens.
  • a laser beam-detonable blasting cap 10 comprises a shell 11 having a bottom plate 12.
  • a secondary explosive 4 containing a laser beam-absorbing material is charged into the upper portion of the shell 11 in a length, generally, within the range of 1-15 mm, which is large enough to cause a complete ignition of the explosive 4 by the absorption of a laser beam, and secondary explosives 13 and 5 are charged in the middle portion and lower portion of the shell 11, respectively.
  • the upper side of the shell 11 is covered with a plug 7 having an optical fiber 8 penetrating through its center portion. That is, the plug 7 is fitted into the upper end portion of the shell 11 while maintaining the penetrated state of the optical fiber 8, whereby the opening at the end of the optical fiber 8 is directly contacted with the explosive 4.
  • the outer side of the shell 11 is surrounded with a restraining wall 6 at the portion surrounding the explosives 4 and 13 arranged in the upper and middle portions, respectively.
  • the pressure of the combustion gas is increased to a high pressure enough to detonate the explosive charged in the lower portion, and the explosive charged in the lower portion is detonated to initiate an explosive, which has been charged in a cartridge case, and in which the laser beam-detonable blasting cap of the present invention has been set.
  • the laser beam-detonable blasting cap of the present invention illustrated in Fig. 2 acts in the same manner as described in the blasting cap illustrated in Fig. 1, except that the explosion proceeds from the explosive in the upper portion through the explosive in the middle portion to the explosive in the lower portion.
  • Figs. 3 and 4 are cross-sectional views illustrating the laser beam-detonable blasting caps according to the second aspect of the present invention, wherein a vacant space is formed between a first chamber and a second chamber, both containing a secondary explosive charged therein.
  • a laser beam-detonable blasting cap 20 comprises a first chamber 21, a second chamber 22 adjacent to the first chamber 21, and an optical fiber 8 arranged in the first chamber 21 at the side opposite to the second chamber 22, the first chamber 21 being defined by a restraining wall 6, a plug 7 and a plate 24, and the second chamber 22 being defined by a shell 26 and a bottom plate 24.
  • a secondary explosive 4 containing a laser beam-absorbing material is charged into the first chamber 21, and the opening at the end of the above described optical fiber 8 is directly contacted with the explosive 4 at its top.
  • the explosive 4 and the end of the optical fiber 8 are surrounded with a restraining wall 6 in the following manner.
  • One end of the optical fiber 8 is fitted into the plug 7, and the plug 7 is fitted into one end of the restraining wall 6 so as to seal the explosive 23 in the first chamber 21.
  • the first chamber 21, and hence the restraining wall 6, is covered with the plate 24 at the end opposite to the plug 7 so as to seal the explosive 23 in the first chamber 21.
  • the second chamber 22 defined by a shell 26 having a bottom plate 3 is arranged adjacent to the plate 24 forming the first chamber 21.
  • a secondary explosive 5 is charged into the shell 26 in an amount that a vacant space 25 is formed in the upper portion of the shell 26.
  • the outer diameter of the shell 26 is made into substantially the same as the outer diameter of the restraining wall 6.
  • the kinds of the secondary explosive and the laser beam-absorbing material, and the addition amount of the laser beam-absorbing material to the secondary explosive are the same as those in the above described first aspect of the present invention.
  • the loading density of the explosive for example when PENT is used, charged in the first chamber 21 and second chamber 22 should be generally within the range of 0.8-1.7.
  • the loading density of the explosive 23 charged in the first chamber 21 should be generally selected from the range of 0.8-1.4, and preferably selected from the range of 0.8-1.2. Because, it is necessary that an explosive 4 charged in the first chamber 21 has a high ignition sensitivity by the laser beam, and can continue combustion after ignition, and can be easily changed from combustion into deflagration, and further can fly the plate 24 of the first chamber 21 by the gas pressure generated in the first chamber 21 to the second chamber 22 in a speed high enough to detonate the explosive 5 charged as a based charge in the second chamber 22 by the collision of the plate 24 with the explosive 5.
  • the loading density of the explosive 5 charged in the second chamber 22 is selected generally from the range of 1-1.7, and preferably from the range of 1.2-1.7. Because, it is necessary that the explosive 5 charged in the second chamber 22 is completely detonated by its collision with the plate 24 flown from the first chamber 21 and has a power high enough to initiate completely an explosive, in which the laser beam-detonable blasting cap according to the present invention has been set. As described above, it is advantageous that the loading density of the explosive charged in the second chamber 22 is higher than that of the explosive charged in the first chamber 21.
  • the restraining wall 6 is arranged in order that, when the explosive 4 charged in the first chamber 21 illustrated in Fig. 3 is ignited and combusted, the pressure of the combustion gas is maintained.
  • the length of the restraining wall 6 should be such that the restraining wall covers the side of the explosive 4 charged in the first chamber 21 illustrated in Fig. 3, and should be at least the same length as the length of the explosive 4 charged in the first chamber 21.
  • This restraining wall 6 may be extended so as to cover the side of the vacant space 25.
  • the restraining wall 6 may be further extended so as to cover the side of the second chamber 22.
  • the explosive 5 charged in the second chamber 22 is somewhat poor in the power for initiating an explosive charged in a cartridge case at the portion contacting with the surface of the outer side of the second chamber 22, as compared with case wherein the side of the second chamber 22 is not covered.
  • the material, thickness and the like of the restraining wall 6 are the same as those in the first aspect of the present invention.
  • the plate 24 for the first chamber 21 illustrated in Fig. 3 is used in order to maintain the explosive 4 in the first chamber 21, and further to be flown to the second chamber 22 by the gas pressure generated by the combustion of the explosive 4, and to collide to the explosive 27 contained in the second chamber 22, causing the detonation of the explosive 5. Therefore, any plates which can be easily flown by the gas pressure generated in the first chamber 21, can be used as the plate 24, and the plate 24 is generally made of a metal of iron, copper, aluminum or the like, and has a thickness within the range of 0.1-1 mm.
  • the material, thickness and the like of the shell 26 can be determined in the same manner as described in the first aspect of the present invention.
  • the optical fiber 8 may be directly contacted with the secondary explosive 4 containing a laser beam-absorbing material or may be indirectly contacted with the explosive 4 through a lens in the same manner as described in the first aspect of the present invention.
  • a laser beam-detonable blasting cap 30 comprises a first chamber 21, and a second chamber 22 adjacent thereto, and an optical fiber 8 arranged in the first chamber 21 at the side opposite to the second chamber 22, the first chamber 21 being defined by a shell 31 having a bottom plate 12, an inner tube 32 and a plug 7, and the second chamber 22 being defined by a shell 37 having a bottom plate 12, and the bottom plate 12 of the upper shell 31.
  • a secondary explosive 13 is charged into the lower portion of the first chamber 21, and a secondary explosive 4 containing a laser beam-absorbing material is charged in the upper portion of the first chamber 21 in a length generally within the range of 1-15 mm.
  • the explosive 4 is covered with an inner tube 32 having a hole, and a plug 7 is arranged on the inner tube 32.
  • the optical fiber 8 is penetrated through the center portion of the plug 7 such that the opening at the end of the optical fiber 8 can be entered into the hole of the above described inner tube 32. Therefore, when the plug 7 is fitted into the upper end portion of the shell 31 and is contacted with the inner tube 32, the opening at the end of the optical fiber 8 is directly contacted with the explosive 4.
  • the shell 37 which defines the second chamber 22 is positioned beneath the shell 31, and the secondary explosive 5 is charged into the second chamber 22 such that a vacant space 25 is formed in the upper portion of the second chamber 5. Further, in this embodiment, the side of the explosives 4 and 13 charged in the first chamber 21 and the side of the vacant space 25 formed in the second chamber 22 are surrounded with a restraining wall 6.
  • the laser-oscillating apparatus for detonating the laser beam-detonable blasting cap there can be used solid lasers, such as ruby laser, YAG laser and the like, and gas lasers, such as carbonic acid gas laser and the like.
  • the oscillating system for laser there can be used any of a continuous oscillation system and a pulse oscillation system.
  • a laser beam having a wavelength of 0.6-11 ⁇ m and pulse duration of 0.1-10 ms is advantageously used.
  • the above described laser beam-detonable blasting cap according to the present invention has the following merits.
  • a laser beam-detonable blasting cap 1 illustrated in Fig. 1 was produced in the following manner.
  • a secondary explosive of PETN used as an explosive 5 to be charged in the lower portion of the shell 2
  • a loading density of 1.40 in a region ranging from 0 mm to 10 mm from the bottom.
  • an iron restraining wall 6 having an inner diameter of 5.0 mm, a thickness of 1 mm and a length of 30 mm was arranged in the shell 2 such that the restraining wall 6 would be in contact with the explosive 5 charged in the lower portion of the shell 2.
  • PETN containing 1% by weight of a laser beam-absorbing material of carbon black having an average particle size of 30 ⁇ m, used as an explosive 4 to be charged into the upper portion of the shell 2 was charged into the inside of the restraining wall 8.
  • a plug 7 was put into the inside of the shell 2 such that the plug 7 was contacted with the restraining wall 6, and the plug 7 was adhered and fixed to the shell 2.
  • An optical quartz fiber 8 having a core diameter of 0.8 mm, a damping factor of 6 dB/km and a length of 30 m was connected to the resulting laser beam-detonable blasting cap 1 illustrated in Fig. 1.
  • a laser beam having a wavelength of 1.06 ⁇ m, a pulse duration of 0.4 ms and an energy of 2.5 J was generated by means of a YAG laser and irradiated to the laser beam-detonable blasting cap 1, the blasting cap 1 was completely detonated and penetrated through the lead plate (40 mm ⁇ 40 mm ⁇ 4 mm) used in the lead plate test defined in Japanese Industrial Standard (abbreviated as JIS) K4806-1978.
  • JIS Japanese Industrial Standard
  • the blasting cap was able to initiate completely an explosive (TNT: trinitrotoluene 70%, talc 30%) used in the test for low explosives defined in JIS, and to give to a lead plate (70 mm ⁇ 70 mm ⁇ 30 mm) an explosion trace substantially the same as that obtained by the use of a No. 6 blasting cap.
  • TNT trinitrotoluene 70%, talc 30%
  • a laser beam-detonable blasting cap 10 illustrated in Fig. 2 was produced in the same manner as described in the production of the laser beam-detonable blasting cap 1 in Example 1, except the following.
  • a copper shell 11 having an inner diameter of 6.2 mm, a thickness of 0.3 mm and a length of 55 mm and having a bottom plate 12 of 0.3 mm thickness was used.
  • a secondary explosive of PETN was charged into the shell 11 in a loading density of 1.40 in the lower region ranging from 0 mm to 15 mm from the bottom plate 12, and in a loading density of 1.15 in the middle region ranging from 15 mm to 35 mm from the bottom plate 12, and a secondary explosive of tetryl containing 1% by weight of a laser beam-absorbing material of a black dyestuff (trademark: Direct Fast Black B, sold by Sumitomo Chemical Co.) was charged into the shell 11 in a loading density of 1.15 in the upper region ranging from 35 mm to 45 mm from the bottom plate 12.
  • a restraining wall 6 made of iron and having an inner diameter of 6.8 mm, a thickness of 1 mm and a length of 40 mm was arranged around the shell 11 such that explosives 4 and 13 charged into the upper portion and middle portion, respectively, were surrounded with the restraining wall 6 and the explosive 5 charged into the lower portion was not covered with the restraining wall 6.
  • Example 1 When the same tests as described in Example 1 were carried out, the same results as obtained in Example 1 was obtained.
  • a conventional laser beam-detonable blasting cap 40 illustrated in Fig. 5 was produced in the following manner.
  • a glass lens 45 was put into a copper restraining wall 47 having a length of 58 mm, an inner diameter of 6 mm and a thickness of 1 mm.
  • a secondary explosive of PETN was used as an explosive 46 to be charged into a first chamber. That is, PETN was charged into the restraining wall 47 to form the first chamber 41 such that the PETN was charged in a loading density of 1.40 in a region ranging from 0 mm to 4 mm from the lens surface, in a loading density of 1.20 in a region ranging from 4 mm to 10 mm from the lens surface, and in a loading density of 1.10 in a region ranging from 10 mm to 16 mm from the lens surface.
  • a circular plate 48 made of copper and having a diameter of 6 mm and a thickness of 0.3 mm was arranged at the position corresponding to the bottom of the first chamber 41 and adhered and fixed to the restraining wall 47. Then, PETN, used as an explosive 50 for the second chamber 42, was charged into the restraining wall 47 so as to form a secondary chamber 42 separated from the first chamber 41 by a vacant space 49 having a length of 5 mm, such that the PETN was charged in a loading density of 1.40 in a region ranging from 21 mm to 25 mm from the lens surface, in a loading density of 1.20 in region ranging from 25 mm to 31 mm from the lens surface, in a loading density of 1.10 in a region ranging from 31 mm to 37 mm from the lens surface, and in a loading density of 1.00 in a region ranging from 37 mm to 43 mm from the lens surface.
  • a copper plate having a diameter of 8 mm and a thickness of 0.3 mm was adhered and fixed to the bottom of the restraining wall 47 to form a bottom plate 51. Then, a plug 44 was put into the restraining wall 47 and an optical fiber 43 was penetrated through the plug 44 and fixed thereto.
  • a laser beam-detonable blasting cap 20 illustrated in Fig. 3 was produced in the following manner.
  • a secondary explosive of PETN was used as an explosive 27 for a second chamber 22, and charged into a copper shell 26 having an outer diameter of 7.6 mm, a thickness of 0.3 mm and a length of 15 mm and having a bottom plate 3 of 0.3 mm thickness in a loading density of 1.40 in a region ranging from 0 mm to 10 mm from the bottom plate 3.
  • a circular plate 24 having a diameter of 7.6 mm and a length of 0.3 mm was adhered and fixed to a restraining wall 6 made of iron and having an inner diameter of 5.6 mm, a thickness of 1 mm and a length of 40 mm, and PETN containing 1% by weight of a laser beam-absorbing material of carbon black, used as an explosive 23 for a first chamber 21, was charged into the restraining wall 6 in a loading density of 1.15 in a region ranging from 0 mm to 30 mm from the plate 24.
  • the copper shell 26 of the second chamber 22 and the plate 24 of the first chamber 21 were adhered and fixed to each other by an adhesive such that the center axes of both the members were agreed to each other, and then a plug 7 was put into the restraining wall 6 and fixed thereto.
  • Example 1 When the same tests as described in Example 1 were carried out by using the resulting laser beam-detonable blasting cap illustrated in Fig. 3, the same good results as obtained in Example 1 were obtained.
  • a laser beam-detonable blasting cap 30 illustrated in Fig. 4 was produced in the same manner as described in Example 3, except the following.
  • a shell 31 having an inner diameter of 6.2 mm and a thickness of 0.3 mm was used as a vessel for a first chamber 38, and an inner tube 32 having an inner diameter of 5.5 mm, a thickness of 0.35 mm and a length of 8 mm was arranged in the shell 31 at the portion contacting with an optical fiber 8.
  • a shell 37 having an inner diameter of 6.2 mm and a thickness of 0.3 mm was used as a vessel for a second chamber 39.
  • Example 1 When the same tests as described in Example 1 were carried out, the same good results as obtained in Example 1 were obtained.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
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Claims (6)

1. Capsule détonante pouvant être mise à feu par un rayon laser, dans laquelle une fibre optique (8) est en contact avec la portion supérieure d'un explosif disposé en plusieurs couches et une paroi de retenue (6) est disposée sur le côté de l'explosif, caractérisée en ce qu'elle comprend:
― une douille (2);
― un explosif (4) chargé dans la portion supérieure de la douille (2) de façon à former l'explosif de couche supérieure (4) de l'explosif multicouche et à être en contact avec la fibre optique (8), cet explosif (4) étant un explosif secondaire constitué par du tétranitrate de pentaérythritol contenant un matériau noir absorbant le rayon laser et chargé à une densité de chargement de 0,8-1,4 g/cm3, et
― un explosif (5) chargé dans la portion inférieure de la douille (2) avec une densité de chargement de 1,1-1,7 g/cm3 de façon à former un explosif de couche inférieure (5) de l'explosif multicouche, seul, le côté de l'explosif de couche supérieure (4) étant entouré par la paroi de retenue.
2. Capsule détonante pouvant être mise à feu par un rayon laser, selon la revendication 1, dans laquelle le matériau noir absorbant le rayon laser est au moins un élément choisi dans le groupe comprenant le noir de charbon, le graphite et une matière colorante noire.
3. Capsule détonante pouvant être mise à feu par un rayon laser selon la revendication 1 ou la revendication 2, dans laquelle l'explosif de couche inférieure (5) est au moins un explosif secondaire choisi dans le groupe comprenant le tétranitrate de pentaérythritol, la trinitrophénylméthylnitramine, la triméthylènetrinitramine et la cyclotétraméthylènetétranitramine.
4. Capsule détonante pouvant être mise à feu par un rayon laser selon la revendication 1, dans laquelle un explosif (13) est chargé entre l'explosif de couche supérieure (4) et l'explosif de couche inférieure (5) pour former un explosif de couche médiane (13) de l'explosif multicouche, l'explosif de couche inférieure (5) et l'explosif de couche médiane (13) sont des explosifs secondaires et les densités de chargement des explosifs des couches supérieure (4), médiane (13) et inférieure (5) sont telles que la densité de chargement de l'explosif de couche médiane (13) est supérieure à celle de l'explosif de couche supérieure (4) et que la densité de chargement de l'explosif de couche inférieure (5) est supérieure à celle de l'explosif de couche médiane (13), et seuls les côtés des explosifs des couches supérieure (4) et médiane (13) sont entourés par la paroi de retenue (6).
5. Capsule détonante pouvant être mise à feu par un rayon laser selon la revendication 1, dans laquelle un espace vide (25) est formé entre l'explosif (4) chargé dans une première chambre (21) ménagée dans la portion supérieure de la douille (2) et l'explosif (5) chargé dans une deuxième chambre (22) ménagée dans la portion inférieure de la douille (2), et seul le côté de la première chambre (21) est entouré par une paroi de retenue (4).
6. Capsule détonante pouvant être mise à feu par un rayon laser selon la revendication 5, dans laquelle l'explosif chargé dans la première chambre (21) est formé d'un explosif secondaire (4), qui occupe sa portion supérieure et contient un matériau noir absorbant le rayon laser, et d'un explosif secondaire (13), qui occupe sa portion inférieure.
EP19880303457 1987-04-30 1988-04-18 Détonateur activable par le faisceau d'un laser Expired EP0289184B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP106744/87 1987-04-30
JP10674487A JPS63273799A (ja) 1987-04-30 1987-04-30 レ−ザ−起爆雷管
JP10674587A JPS63273800A (ja) 1987-04-30 1987-04-30 レ−ザ−起爆雷管
JP106745/87 1987-07-11

Publications (2)

Publication Number Publication Date
EP0289184A1 EP0289184A1 (fr) 1988-11-02
EP0289184B1 true EP0289184B1 (fr) 1991-12-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880303457 Expired EP0289184B1 (fr) 1987-04-30 1988-04-18 Détonateur activable par le faisceau d'un laser

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EP (1) EP0289184B1 (fr)
DE (1) DE3867117D1 (fr)

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FR2659137B1 (fr) * 1990-03-01 1994-06-17 France Etat Armement Initiateur pyrotechnique laser a fibre optique.
DE19546341C2 (de) * 1995-12-12 1999-03-18 Schneider Alexander Durch Laserstrahlung geringer Intensität initiierbarer, optischer Sprengzünder
EP0918667B1 (fr) * 1996-08-19 2002-11-06 Siemens Aktiengesellschaft Dispositif de declenchement d'un systeme de retenue dans un vehicule a moteur
DE19837839A1 (de) * 1998-08-20 2000-02-24 Dynamit Nobel Ag Zündelement mit einer Laserlichtquelle
FR2831659B1 (fr) * 2001-10-26 2004-04-09 Saint Louis Inst Detonateur optique basse energie
FR2914056B1 (fr) * 2007-03-21 2010-03-12 Nexter Munitions Initiateur opto pyrotechnique
US8161880B2 (en) * 2009-12-21 2012-04-24 Halliburton Energy Services, Inc. Deflagration to detonation transition device
SE539175C2 (en) * 2015-10-05 2017-05-02 Life Time Eng Ab Detonator provided with a securing device
CN109269366B (zh) * 2018-10-31 2023-10-20 绵阳市金华洋电器制造有限公司 一种冲击片雷管发火专用转接线及其铅板的注塑方法
RU2761916C1 (ru) * 2020-09-22 2021-12-14 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") Детонирующее устройство
CN115784825B (zh) * 2022-12-26 2023-08-11 山东泰山民爆器材有限公司 内置空腔式飞片雷管

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
WO2008113108A1 (fr) * 2007-03-16 2008-09-25 Orica Explosives Technology Pty Ltd Amorçage de matériaux explosifs
EP2142877A1 (fr) * 2007-03-16 2010-01-13 Orica Explosives Technology Pty Ltd Amorçage de matériaux explosifs
EA015380B1 (ru) * 2007-03-16 2011-08-30 Орика Иксплоусивз Текнолоджи Пти Лтд. Инициирование взрывчатых веществ
AU2008229625B2 (en) * 2007-03-16 2012-06-14 Orica Explosives Technology Pty Ltd Initiation of explosives materials
EP2142877A4 (fr) * 2007-03-16 2013-02-27 Orica Explosives Tech Pty Ltd Amorçage de matériaux explosifs

Also Published As

Publication number Publication date
DE3867117D1 (de) 1992-02-06
EP0289184A1 (fr) 1988-11-02

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