RP EBW Detonator. P/N . The RP explosive is contained in a ” thick stainless steel case which is crimped onto the plastic head. OPEN ACCESS. A view on the functioning mechanism of EBW detonators -part 1: electrical characterisation. To cite this article: E A Lee et al J. Phys.: Conf. Exploding Bridgewire (EBW) Detonators are in widespread use and have proven reliability and performance characteristics. Since their invention there have.
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Low- impedance capacitors and low-impedance coaxial cables are required to achieve the necessary current rise rate.
To find out more, see our Privacy and Cookies policy. This has led to their common use in nuclear weapons. Conventional blasting caps use electricity to heat a bridge wire rather than vaporize it, and that heating then causes the primary explosive to detonate. Since explosives detonate at typically 7—8 kilometers per second, or 7—8 meters per millisecond, a 1 millisecond delay in detonation from one side of a nuclear weapon to the other would be longer than the time the detonation would take detonatod cross the weapon.
Given a sufficiently high and well known amount of electric current and voltage, the timing of the bridgewire vaporization is both extremely short a few microseconds and extremely precise and predictable standard deviation of time to detonate as low as a few tens of nanoseconds. Closeup of a detonator set.
A view on the functioning mechanism of EBW detonators -part 1: electrical characterisation
The EBW and the slapper detonator are the safest known types of detonators, as only a very high-current fast-rise pulse can successfully trigger them. The precise timing of EBWs is achieved by the detonator using direct physical effects of the vaporized bridgewire to initiate detonation in the detonator’s booster charge. EBWs use a different physical mechanism than blasting caps, using more electricity delivered much more rapidly, and explode in a much more precise timing after the electric current is applied, by the process of exploding wire method.
Views Read Edit View history. Primary explosives such as lead azide are very sensitive to static electricity, radio frequency, shock, etc. Content from this work may be used under the terms of the Creative Commons Attribution 3.
To achieve the melting and subsequent vaporizing of the wire in time sufficiently short to create a shock wave, a current rise rate of at least amperes per microsecond is required. The flux compression generator is one alternative to capacitors. When the wire is connected across this voltage, the resulting high current melts and then vaporizes the wire in a few microseconds.
This accounts for the heavy cables seen in photos of the Trinity ” Gadget “; high voltage cable requires good insulation and they had to deliver a large current with little voltage drop, lest the EBW not achieve the phase transition quickly enough.
Exploding-bridgewire detonator – Wikipedia
In a fission bomb, the same or similar circuit is used for powering the neutron triggerthe initial source of fission neutrons. During initiation, the wire heats with the passing current until melting point is reached. Detonators without such booster are called initial pressing detonators IP detonators. Detonators Nuclear weapon design. This is roughly 1, to 10, times longer and less precise than the EBW electrical vaporization.
Their use is limited by the thermal stability range of PETN.
RP-1 EBW Detonator
Retrieved from ” https: The exploding-bridgewire detonator EBWalso known as exploding wire detonator is a type of detonator used to initiate the detonation reaction in explosive materialssimilar to a blasting cap because it is fired using an electric current. A low energy ewb capacitor equivalent to a compression generator would be roughly the size of a soda can.
However, they require a bulky power ebww for the current surges required. Any further distribution of this work must maintain attribution to the author s and the title of the work, journal citation and DOI. If the current rise rate dettonator lower, the bridge may burn, perhaps causing deflagration of the PETN pellet, but it will not cause detonation. E A Lee et al J. However, there is still not a universally accepted mechanism.
This is sufficiently precise for very low tolerance applications such as nuclear weapon explosive lenses.
This paper is the first of three characterising the initiation of PETN in an exploding bridgewire detonator to understand the underlying mechanism. Exploding Bridgewire EBW Detonators are in widespread use and have proven reliability and performance characteristics. Consequently, the detonators must have very precise timing.
The larger round objects with two wires coming out parallel to ew surface are diagnostic equipment.
Sign up for new issue notifications. The extremely short rise times are usually achieved by discharging a low- inductancehigh-capacitance, high-voltage capacitor e. The resulting shock and heat initiate the high explosive. This is achieved via conventional explosives placed uniformly around the pit. Closeup with EBW highlighted. The heating rate is high enough that the liquid metal has no time to flow away, and heats further until it vaporizes.
Detonator wires highlighted in yellow. From Wikipedia, the free encyclopedia. In the US, due to their common use in nuclear weapons, these devices are subject to the nuclear control authorities in every state, according to the Guidelines for the Export of Nuclear Material, Equipment and Technology. The Fat Man Model EBW detonators used an unusual, high reliability detonator system with two EBW “horns” attached to a single booster charge, which then fired each of the 32 explosive lens units.
EBWs have found uses outside nuclear weapons, such as the Titan IV safety ebs applications where stray electrical currents might detonate normal blasting caps, and applications requiring very precise timing for multiple point commercial blasting in mines or quarries. Since their invention there have been numerous studies to identify the mechanism by which the exploding bridgewire initiates the explosive.