CA2031409A1 - Electro-optical detonator - Google Patents
Electro-optical detonatorInfo
- Publication number
- CA2031409A1 CA2031409A1 CA002031409A CA2031409A CA2031409A1 CA 2031409 A1 CA2031409 A1 CA 2031409A1 CA 002031409 A CA002031409 A CA 002031409A CA 2031409 A CA2031409 A CA 2031409A CA 2031409 A1 CA2031409 A1 CA 2031409A1
- Authority
- CA
- Canada
- Prior art keywords
- detonator
- electromagnetic radiation
- pyrotechnic
- switching means
- primary battery
- 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.)
- Abandoned
Links
Abstract
8.
ABSTRACT:
The invention relates to a Optical Detonator comprising provision to accept a fibreoptic light guide cable 14 within a terminal socket 12 whereby a electromagnetic radiation signal passed down the fibreoptic light guide cable 14 activates a photo-conductor device 16 located within the hollow body portion 3 of the detonator 1 to allow adjacent primary battery means 20 as the electrical energizing source to pass a electric current through fusehead 7/8 to fire the detonator.
8.
ABSTRACT:
The invention relates to a Optical Detonator comprising provision to accept a fibreoptic light guide cable 14 within a terminal socket 12 whereby a electromagnetic radiation signal passed down the fibreoptic light guide cable 14 activates a photo-conductor device 16 located within the hollow body portion 3 of the detonator 1 to allow adjacent primary battery means 20 as the electrical energizing source to pass a electric current through fusehead 7/8 to fire the detonator.
8.
Description
- - 2~3~40 1.
TITLE: EL CTRO -OPTICAL DETONATOR.
FIELD OF INVENTION
.
This invention is concerned with a detonator for explosive composit- . --ions and in particular is concerned with a detonator which employes as - ;~
a fail safe device , an opti~ally actuated switching means to close an electrical energizing circuit.
Electrically actuated detonators comprising a thermo-resistive element coated with an initiating "flashing" pyrotechnic compound are well known.
Such devices are inexpensive to manufacture and are known to be extremely lO.reliable in use as well as relatively safe in storage and handling.
Electrical detonators have a major disadvantage in that they require connection via electrically conductive cables to a remote detonating device providing a source of electrical energy. Accidental explosions have been attributed to spurious electrical currents induced or conducted in the electrical conductors by electrical machinery, static earth charges, lightning, high voltage transmission line corona discharge, radio frequ--ency transmission and the like.
In an endeavour to overcome the dangers associated with conventional electrically actuated detonators of the type described above, various 20.non-electric systems have been proposed.
One type of non-electrically actuated detonator described in the known patent specifications relating to blasting detonators systems `: , ; .
. .................. . .
~ )31~
employs a tubular lead, the inner surface of which i5 coated with a deflagrating material. When the deflagrating material is fired at a remote end of the tubular lead, a shock wave is propagated down the interior of the tubular lead to detonate the explosive composite of the detonator. A non-electrical blssting initiating system of this type is described in United States patent number 4,757,764.
While generally effective for its purpose and relatively safe in use such non-electric initiating systems have been the cause of a number of large blast project failures and are limited to a short shelf life. lhe system is complicated to systemize with a shock wave speed ot 1.8 kilometers per second compared to 300,000 kilometers per second for optic initiation.
Swedish patent application number 8,503,595 describes a fibre-optic ignition system for explos~e compositions wherein optical energy is converted by a photo-voltaic cell into electrical energy. The elect-rical energy is amplified and stored in a capacitor for selective release via electrical conductors to a conventional electric detonator. While this system avoids the necessity for long electrical conductors between tho dutonator and the remote initiating position (with the attendant 2û riaks described above) the requirement of expensive fibre-optic cables capable of transmitting a large amount of energy to charge the capacitor, with its ability to hold the full charge for only a short period. The firing of the detonator would require a further signal from the remote triggering station.
The formation of a continuous electrically conductive circuit between the electrical switching means of the optical initiating device and the detonator is considered to pose an unacceptable risk of premature detonation from spurious induced or conductive currents in the electrical conductors. 2 ' '. ~
:
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~ 3~
3.
United States Patent Numbers 3812783,4403143 and 3408937 are illust--rative of non-electric blast initiation systems employing high intensity laser radiation transmitted via an optical fire cable to a detonating device.
Prior art blast initiating systems employing Laser energy as a sole energizing source are relatively safe in use but currently uneconomical in use and of dubious reliability.
It is an aim of the present invention to overcome or alleviate the problems of prior art blast initiation systems and to provide a safe, 10. reliable and economic explosives detonator and initiation system therefore.
BROAD DESCRIPTION OF THE INVENTION
According to one aspect of the invention there is provided a deton--ator comprising:-a hollow body portion containing adjacent a closed end thereof a quantity of explosive material;
a electrical resistance element spaced from a said quantity of explosive material, which may be combined with an optional deflagrating chemical time-delay charge to fire the main detonating charge; said elect--rical resistance element having associated therewith a quantity af therm-20.-ally energizable initiating pyrotechnic material; and, a switching means responsive to electromagnetic radiation.
a contained primary battery means as the electrical energizing source.
a terminal socket located wlthin the proximal end of the deton--ator hollow body portion to securely accept the terminal plug attached to the distal end of the fibreoptic light guide cable.
Switching means responsive to electromagnetic radiation is coupled with a primary battery means and the electrical resistance element .
Said switching means when actuated by the correct radiation signal closes 30-an electrical circuit associated with said resistance element and primary battery means whereby the pyrotechnic fusehead is thermally ignited.
Preferably said electromagnetic radiation responsive switching means comprises a photo-conductive device.
3.
. .
TITLE: EL CTRO -OPTICAL DETONATOR.
FIELD OF INVENTION
.
This invention is concerned with a detonator for explosive composit- . --ions and in particular is concerned with a detonator which employes as - ;~
a fail safe device , an opti~ally actuated switching means to close an electrical energizing circuit.
Electrically actuated detonators comprising a thermo-resistive element coated with an initiating "flashing" pyrotechnic compound are well known.
Such devices are inexpensive to manufacture and are known to be extremely lO.reliable in use as well as relatively safe in storage and handling.
Electrical detonators have a major disadvantage in that they require connection via electrically conductive cables to a remote detonating device providing a source of electrical energy. Accidental explosions have been attributed to spurious electrical currents induced or conducted in the electrical conductors by electrical machinery, static earth charges, lightning, high voltage transmission line corona discharge, radio frequ--ency transmission and the like.
In an endeavour to overcome the dangers associated with conventional electrically actuated detonators of the type described above, various 20.non-electric systems have been proposed.
One type of non-electrically actuated detonator described in the known patent specifications relating to blasting detonators systems `: , ; .
. .................. . .
~ )31~
employs a tubular lead, the inner surface of which i5 coated with a deflagrating material. When the deflagrating material is fired at a remote end of the tubular lead, a shock wave is propagated down the interior of the tubular lead to detonate the explosive composite of the detonator. A non-electrical blssting initiating system of this type is described in United States patent number 4,757,764.
While generally effective for its purpose and relatively safe in use such non-electric initiating systems have been the cause of a number of large blast project failures and are limited to a short shelf life. lhe system is complicated to systemize with a shock wave speed ot 1.8 kilometers per second compared to 300,000 kilometers per second for optic initiation.
Swedish patent application number 8,503,595 describes a fibre-optic ignition system for explos~e compositions wherein optical energy is converted by a photo-voltaic cell into electrical energy. The elect-rical energy is amplified and stored in a capacitor for selective release via electrical conductors to a conventional electric detonator. While this system avoids the necessity for long electrical conductors between tho dutonator and the remote initiating position (with the attendant 2û riaks described above) the requirement of expensive fibre-optic cables capable of transmitting a large amount of energy to charge the capacitor, with its ability to hold the full charge for only a short period. The firing of the detonator would require a further signal from the remote triggering station.
The formation of a continuous electrically conductive circuit between the electrical switching means of the optical initiating device and the detonator is considered to pose an unacceptable risk of premature detonation from spurious induced or conductive currents in the electrical conductors. 2 ' '. ~
:
`, .
~ 3~
3.
United States Patent Numbers 3812783,4403143 and 3408937 are illust--rative of non-electric blast initiation systems employing high intensity laser radiation transmitted via an optical fire cable to a detonating device.
Prior art blast initiating systems employing Laser energy as a sole energizing source are relatively safe in use but currently uneconomical in use and of dubious reliability.
It is an aim of the present invention to overcome or alleviate the problems of prior art blast initiation systems and to provide a safe, 10. reliable and economic explosives detonator and initiation system therefore.
BROAD DESCRIPTION OF THE INVENTION
According to one aspect of the invention there is provided a deton--ator comprising:-a hollow body portion containing adjacent a closed end thereof a quantity of explosive material;
a electrical resistance element spaced from a said quantity of explosive material, which may be combined with an optional deflagrating chemical time-delay charge to fire the main detonating charge; said elect--rical resistance element having associated therewith a quantity af therm-20.-ally energizable initiating pyrotechnic material; and, a switching means responsive to electromagnetic radiation.
a contained primary battery means as the electrical energizing source.
a terminal socket located wlthin the proximal end of the deton--ator hollow body portion to securely accept the terminal plug attached to the distal end of the fibreoptic light guide cable.
Switching means responsive to electromagnetic radiation is coupled with a primary battery means and the electrical resistance element .
Said switching means when actuated by the correct radiation signal closes 30-an electrical circuit associated with said resistance element and primary battery means whereby the pyrotechnic fusehead is thermally ignited.
Preferably said electromagnetic radiation responsive switching means comprises a photo-conductive device.
3.
. .
2~3~ 3 4.
DETAILED DESCRIPTION OF THE INVENTION.
In order that the invention may be more clearly understood ,refer--ence will now be made to a preferred embodiment illustrated in the accompanying drawings. Figure 1 shows a typical embodiment of the device `
of the invention.
The drawings illustrate in cross-section a detonator l and portion of a free end of a fibreoptic light guide 2, as a schematic projection.
Detonator 1 comprises a hollow body portion 3 having a closed distal end 4 adjacent which is located a quantity of explosive chemical material 10. 5. Chemical time-delay deflagrating material 10 may be optionally incorp--orated adjacent to the detonating material 5.
A insulating means 9 supports the electrical resistance element 7 which is coated with a chemical deflagrating pyrotechnic material 8 of the type commonly employed in prior art electric detonators to initiate fusion of the detonating material 10 and 5.
Said electrical resistance element 7 coated with a thermally ignit--able pyrotechnic material 8 as the "fusehead",is spaced from a quantity of chemical explosive material lO and 5 placed adjacent to closed end 4 of detonator l elongated body portion 3. Quantity of chemical explosive 20. material lO and 5 may consist of more than one part compounded as a quant--ity of deflagrating pyrotechnic chemical time-delay material lO placed adjacent to a quantity of detonating chemical explosive material 5 ,said quantity of deflagrating pyrotechnic chemical time-delay material lO
would be spaced from the pyrotechnic fusehead 8.
A primary battery means 20 contained adjacent to the electrical resistance element 7 would provide the electrical energy source to power the device. Activation of the circuit would occur when a electromagnetic radiation signal sent down the fibreoptic light guide engaged within the proximal end ll of the detonator casing 3 to impinge at 15 on an adj-30. -acent placed photo-conducter device 16 such as a photo-diode or as a photo-transister switching means responsive to electromagnetic radiation.
Said primary battery means 20 will have a energy capacity level suff--icient to heat the electrical resistance element 7 to provide thermal energizing of the resistance element 7 chemical pyrotechnic coating 8 to cause ignition of the adjacent explosive materials lO and 5 contained within the detonator casing 3.
4.
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Primary battery means 20 may have an isolating switch means 17 incorporated in the electric circuitry layout . Said switching means would be separate and additional to the electromagnetic radiation respon--ive switching means.
A terminal socket placed within the mouth at the proximal end of the elongated hollow body portion of the detonator casing is arranged to accept the mating terminal plug encasing the distal end of the fibreoptic light guide cable 24 .
Isolating switch means incorporated in the primary battery means 20 10. circuit may be located within the socket terminal 12 placed within the proximal end 11 of the detonator casing 3.
Isolating switch 17 would be in the normallynopen~state and would be "closed"by the insertion of the fibreoptic light guide cable terminal plug 14 into the terminal socket 12 of the detonator.
The photo-conductor device 16 as the electromagnetic radiation respon--sive switching means is mounted within the hollow body portion 3 of the detonator near its proximal end 12 adjacent to the rear of the terminal socket 12 whereby the radiation sensing area 15 of the photo-conductor switching means is in axial alignment with the optic fibres encased by 20. the terminal plug 14 of the light guide cable when inserted into said terminal socket means 12 of the detonator.
In operation the photo- conducter device 16 of the detonator on receiving an electromagnetic radiation signal from the external radiation source by way of the connected fibreoptic light guide cable , triggers the electromagnetic switching means to allow a conductive circuit to be formed to pass an electric current from the primary battery means 20 through the electrical resistance element 7, thereby to ignite the thermal pyrotechnic chemical coating 8 to fire the detonator .
Preferably the external electromagnetic radiation source would be a 30. laser device producing a radiation signal as a coherent monochromatic collimated energy beam. Due to the need only for low powered energy by photo-conductive switching means within the detonator a low cost fibre -optic light guide cable would suffice.
5.
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Fibre optic light guide can be arranged as a suitable plug-in/adaptor means or be crimp sealed into the body portions 3 at prox-imal end 11 of the detonator case.
It is understood the distal end of the fibre optic light guide would align with the optic sensing means of the photo-conductor switching means 16 to allow electromagnetic radiation energy such a infra-red radiato~to imping on sensitive area of ~hoto-conductor 16 such as a photo-diode or transistor to close the electrical circuit between the adjacent mounted primary battery and the circuit of the resistance element to fire the fusing means. This would only occur when the correct pre-selected radiation energy signal was sent down the fibre optic light guide from the firing station to the detonator. : ~
-In use the detonator 1 is connected to free end of optical conductor, the opposite ends of conductor is connected at a remote position to a source of electromagnetic radiation energy respectively controlled by the remote firing means.
'.
It will be appreciated by a skilled addressee that even though the detonator according to the present invention i5 structurally and otherwise functionally identical to a prior art electric detonator, the inherent dangers associated with spurious electrical charges are avoided by the incorporation in detonator of ~a switching means responsive to electromagnetic radiation to close the detonator in-housed electrical circuit of the primary battery means and the electrical element of the fusing means, g4~ranteeing no-risk of premature detonation of the device.
6.
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The detonator may be manufactured with a suitable length of fibre optic cable attachedthereto, the free end of the fibre optic cable terminating in an optical coupling device.
Alternatively the detonator may be manufactured without a fibre optic cable attached. The plug 13 may be made of a resilient poly-meric material or other deformable material with a central cable receiv-ing aperture. Dver the end of the plug 13 is a thin piercable closure such as a plastics film or aluminium foil to protect the detonator against ingress of contaminants such as waterl dirt etc.
In use the frse end of a fibre optic-cable is pushed against the closure to pierce an aperture therein and the cable is then pushed through the aperture in plug 13 until the free end abuts against the inner wall. The resilient plug 13 firmly retains the fibre-optics cable.
In the variation described above, the use of expensive fibre optics couplers may be avoided.
The detonators according to the present invention thus possess the advantages of prior art electrical detonators in terms of relia-bility and economy but otherwise avoid the dangers inherent therein.
It will be clear to a qkilled addressee that many modifications nnd variations may be made to the present invention without departing from the ~.pirit and scope thereof.
DATED this ~ day of ~ ~oL~ , ~ , / 9 9 o ARTHUR GEûRGE YARRINGTON
1. ~'~' ,'.
~ '- ' ' '.' ' ~
:' '. - ~ : ~: .
DETAILED DESCRIPTION OF THE INVENTION.
In order that the invention may be more clearly understood ,refer--ence will now be made to a preferred embodiment illustrated in the accompanying drawings. Figure 1 shows a typical embodiment of the device `
of the invention.
The drawings illustrate in cross-section a detonator l and portion of a free end of a fibreoptic light guide 2, as a schematic projection.
Detonator 1 comprises a hollow body portion 3 having a closed distal end 4 adjacent which is located a quantity of explosive chemical material 10. 5. Chemical time-delay deflagrating material 10 may be optionally incorp--orated adjacent to the detonating material 5.
A insulating means 9 supports the electrical resistance element 7 which is coated with a chemical deflagrating pyrotechnic material 8 of the type commonly employed in prior art electric detonators to initiate fusion of the detonating material 10 and 5.
Said electrical resistance element 7 coated with a thermally ignit--able pyrotechnic material 8 as the "fusehead",is spaced from a quantity of chemical explosive material lO and 5 placed adjacent to closed end 4 of detonator l elongated body portion 3. Quantity of chemical explosive 20. material lO and 5 may consist of more than one part compounded as a quant--ity of deflagrating pyrotechnic chemical time-delay material lO placed adjacent to a quantity of detonating chemical explosive material 5 ,said quantity of deflagrating pyrotechnic chemical time-delay material lO
would be spaced from the pyrotechnic fusehead 8.
A primary battery means 20 contained adjacent to the electrical resistance element 7 would provide the electrical energy source to power the device. Activation of the circuit would occur when a electromagnetic radiation signal sent down the fibreoptic light guide engaged within the proximal end ll of the detonator casing 3 to impinge at 15 on an adj-30. -acent placed photo-conducter device 16 such as a photo-diode or as a photo-transister switching means responsive to electromagnetic radiation.
Said primary battery means 20 will have a energy capacity level suff--icient to heat the electrical resistance element 7 to provide thermal energizing of the resistance element 7 chemical pyrotechnic coating 8 to cause ignition of the adjacent explosive materials lO and 5 contained within the detonator casing 3.
4.
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Primary battery means 20 may have an isolating switch means 17 incorporated in the electric circuitry layout . Said switching means would be separate and additional to the electromagnetic radiation respon--ive switching means.
A terminal socket placed within the mouth at the proximal end of the elongated hollow body portion of the detonator casing is arranged to accept the mating terminal plug encasing the distal end of the fibreoptic light guide cable 24 .
Isolating switch means incorporated in the primary battery means 20 10. circuit may be located within the socket terminal 12 placed within the proximal end 11 of the detonator casing 3.
Isolating switch 17 would be in the normallynopen~state and would be "closed"by the insertion of the fibreoptic light guide cable terminal plug 14 into the terminal socket 12 of the detonator.
The photo-conductor device 16 as the electromagnetic radiation respon--sive switching means is mounted within the hollow body portion 3 of the detonator near its proximal end 12 adjacent to the rear of the terminal socket 12 whereby the radiation sensing area 15 of the photo-conductor switching means is in axial alignment with the optic fibres encased by 20. the terminal plug 14 of the light guide cable when inserted into said terminal socket means 12 of the detonator.
In operation the photo- conducter device 16 of the detonator on receiving an electromagnetic radiation signal from the external radiation source by way of the connected fibreoptic light guide cable , triggers the electromagnetic switching means to allow a conductive circuit to be formed to pass an electric current from the primary battery means 20 through the electrical resistance element 7, thereby to ignite the thermal pyrotechnic chemical coating 8 to fire the detonator .
Preferably the external electromagnetic radiation source would be a 30. laser device producing a radiation signal as a coherent monochromatic collimated energy beam. Due to the need only for low powered energy by photo-conductive switching means within the detonator a low cost fibre -optic light guide cable would suffice.
5.
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Fibre optic light guide can be arranged as a suitable plug-in/adaptor means or be crimp sealed into the body portions 3 at prox-imal end 11 of the detonator case.
It is understood the distal end of the fibre optic light guide would align with the optic sensing means of the photo-conductor switching means 16 to allow electromagnetic radiation energy such a infra-red radiato~to imping on sensitive area of ~hoto-conductor 16 such as a photo-diode or transistor to close the electrical circuit between the adjacent mounted primary battery and the circuit of the resistance element to fire the fusing means. This would only occur when the correct pre-selected radiation energy signal was sent down the fibre optic light guide from the firing station to the detonator. : ~
-In use the detonator 1 is connected to free end of optical conductor, the opposite ends of conductor is connected at a remote position to a source of electromagnetic radiation energy respectively controlled by the remote firing means.
'.
It will be appreciated by a skilled addressee that even though the detonator according to the present invention i5 structurally and otherwise functionally identical to a prior art electric detonator, the inherent dangers associated with spurious electrical charges are avoided by the incorporation in detonator of ~a switching means responsive to electromagnetic radiation to close the detonator in-housed electrical circuit of the primary battery means and the electrical element of the fusing means, g4~ranteeing no-risk of premature detonation of the device.
6.
. .
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- , :. , :
The detonator may be manufactured with a suitable length of fibre optic cable attachedthereto, the free end of the fibre optic cable terminating in an optical coupling device.
Alternatively the detonator may be manufactured without a fibre optic cable attached. The plug 13 may be made of a resilient poly-meric material or other deformable material with a central cable receiv-ing aperture. Dver the end of the plug 13 is a thin piercable closure such as a plastics film or aluminium foil to protect the detonator against ingress of contaminants such as waterl dirt etc.
In use the frse end of a fibre optic-cable is pushed against the closure to pierce an aperture therein and the cable is then pushed through the aperture in plug 13 until the free end abuts against the inner wall. The resilient plug 13 firmly retains the fibre-optics cable.
In the variation described above, the use of expensive fibre optics couplers may be avoided.
The detonators according to the present invention thus possess the advantages of prior art electrical detonators in terms of relia-bility and economy but otherwise avoid the dangers inherent therein.
It will be clear to a qkilled addressee that many modifications nnd variations may be made to the present invention without departing from the ~.pirit and scope thereof.
DATED this ~ day of ~ ~oL~ , ~ , / 9 9 o ARTHUR GEûRGE YARRINGTON
1. ~'~' ,'.
~ '- ' ' '.' ' ~
:' '. - ~ : ~: .
Claims (10)
1.
THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:
1. A detonator comprising:-a elongated hollow body portion with a closed end encasing a con--tained quantity of chemical explosive material adjacent to said closed end;
a electrical resistance element coated with a thermally ignitable pyrotechnic chemical material as the pyrotechnic fusehead spaced from said quantity of chemical explosive material ;
a primary battery means contained adjacent to said electrical resistance element pyrotechnic fusehead ;
a electromagnetic radiation responsive switching means contained adjacent to said primary battery means whereby electrical circuit connect--ions allow a conductive circuit to be formed to pass a electric current from the primary battery means through the electrical resistance element, controlled by the electromagnetic radiation responsive switching means in response to energization by a electromagnetic radiation signal from an external radiation source;
a terminal socket means placed within the mouth at the proximal end of the elongated hollow body portion of the detonator casing , to accept the terminal of the fibreoptic light guide cable;
a isolating switch means incorporated in primary battery circuit, said isolating switch means being separate and additional to said electro-magnetic radiation responsive switching means.
THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:
1. A detonator comprising:-a elongated hollow body portion with a closed end encasing a con--tained quantity of chemical explosive material adjacent to said closed end;
a electrical resistance element coated with a thermally ignitable pyrotechnic chemical material as the pyrotechnic fusehead spaced from said quantity of chemical explosive material ;
a primary battery means contained adjacent to said electrical resistance element pyrotechnic fusehead ;
a electromagnetic radiation responsive switching means contained adjacent to said primary battery means whereby electrical circuit connect--ions allow a conductive circuit to be formed to pass a electric current from the primary battery means through the electrical resistance element, controlled by the electromagnetic radiation responsive switching means in response to energization by a electromagnetic radiation signal from an external radiation source;
a terminal socket means placed within the mouth at the proximal end of the elongated hollow body portion of the detonator casing , to accept the terminal of the fibreoptic light guide cable;
a isolating switch means incorporated in primary battery circuit, said isolating switch means being separate and additional to said electro-magnetic radiation responsive switching means.
2. A detonator as claimed in claim 1 wherein said quantity of chemical explosive material may consist of more than one part, compounded as a combination of aquantity of deflagrating pyrotechnic chemical time-delay material placed adjacent to a quantity of detonating chemical explosive material, said quantity of deflagrating pyrotechnic chemical time-delay material would be spaced from said pyrotechnic fusehead.
2.
2.
3. A detonator as claimed in claim 1 wherein the electromagnetic radiation responsive switching means has its radiation sensing area in axial alignment with optical fibres encased by the terminal plug of the light guide cable when inserted into terminal socket means of the detonator.
4. A detonator as claimed in claim 1 wherein the primary battery means has a energy capacity level sufficent to heat the electrical resistance element to provide thermal energizing of the elements chemical pyrotechnic coating.
5. A detonator as claimed in claim 1 wherein a isolating switch means incorporated in the primary battery means circuit to electromagnetic radiation responsive switching means , would be in the normally "open"
state and would be "closed" by the insertion of the fibreoptic light guide cable terminal plug into the terminal socket of the detonator.
state and would be "closed" by the insertion of the fibreoptic light guide cable terminal plug into the terminal socket of the detonator.
6. A detonator as claimed in claim 1 wherein said electromagnetic radiation responsive switching means comprises a photo-conductive device.
7. A detonator as claimed in claim 6 wherein said photo-conductive device comprises a photo-diode.
8. A detonator as claimed in claim 6 wherein said photo-conductive device comprises a photo-transister.
9. A detonator as claimed in claim 6 wherein said electromagnetic radiation responsive switching means is responsive to electromagnetic radiation from a laser device.
10. A detonator as described and illustrated in the accompanying specific--ations and drawings.
2.
2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002031409A CA2031409A1 (en) | 1990-12-04 | 1990-12-04 | Electro-optical detonator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002031409A CA2031409A1 (en) | 1990-12-04 | 1990-12-04 | Electro-optical detonator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2031409A1 true CA2031409A1 (en) | 1992-06-05 |
Family
ID=4146582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002031409A Abandoned CA2031409A1 (en) | 1990-12-04 | 1990-12-04 | Electro-optical detonator |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2031409A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7810430B2 (en) | 2004-11-02 | 2010-10-12 | Orica Explosives Technology Pty Ltd | Wireless detonator assemblies, corresponding blasting apparatuses, and methods of blasting |
| CN107843145A (en) * | 2017-10-20 | 2018-03-27 | 安徽理工大学 | A kind of laser ignition formula gas blast device and its application method |
-
1990
- 1990-12-04 CA CA002031409A patent/CA2031409A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7810430B2 (en) | 2004-11-02 | 2010-10-12 | Orica Explosives Technology Pty Ltd | Wireless detonator assemblies, corresponding blasting apparatuses, and methods of blasting |
| CN107843145A (en) * | 2017-10-20 | 2018-03-27 | 安徽理工大学 | A kind of laser ignition formula gas blast device and its application method |
| CN107843145B (en) * | 2017-10-20 | 2023-09-26 | 安徽理工大学 | Laser ignition type gas blasting device and application method thereof |
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Legal Events
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