​​​​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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Views Read Edit View history. Since their invention there have been numerous studies to identify the mechanism by which the exploding bridgewire initiates the explosive. During initiation, the wire heats with the passing current until melting point is reached. This page was last edited on 31 Octoberat However, there is still not a universally accepted mechanism. The flux compression generator is one alternative to capacitors.

The EBW is the Y-shaped device with two wires coming in at angles along the surface. A very rough approximation for the capacitor is a rating of 5 kilovolts detontaor 1 microfarad, and the peak current ranges between and amperes. The most common commercial detonaror size is 0. Detonator wires highlighted in yellow.

The implosion must be highly symmetrical or the plutonium would simply be ejected at the low-pressure points. This is achieved via conventional explosives placed uniformly around the pit. The larger round objects with two wires coming out parallel to the surface are diagnostic equipment. To achieve the melting and subsequent vaporizing of the wire in time xetonator short to create a shock wave, a current rise rate of at least amperes per microsecond is required.

In a fission bomb, the same or similar circuit is used for powering the neutron triggerthe initial source of fission neutrons. During this phase the electrical resistance of the bridgewire assembly rises. This is sufficiently precise for very low tolerance applications such as nuclear weapon explosive lenses.


Modern exploding-bridgewire detonators arranged in a tray.

A view on the functioning mechanism of EBW detonators -part 1: electrical characterisation

Exploding Bridgewire EBW Detonators are in widespread use and have proven reliability and performance characteristics. The measurement of current, time to bridgewire burst and the transient voltage across the bridgewire at burst have enabled the determination of the energy used in bursting the bridgewire. Closeup with EBW highlighted. Conventional blasting caps use electricity to heat a bridge wire rather than vaporize it, and that heating then causes the primary explosive to detonate.

Low- impedance capacitors and low-impedance coaxial cables are required to achieve the necessary current rise rate.

Exploding-bridgewire detonator – Wikipedia

Then an electric arc forms in the metal vapor, leading to drop of electrical resistance and sharp growth of the current, quick further heating of the ionized metal vapor, and formation of a shock wave. This paper is the first of three characterising the initiation of PETN in an exploding bridgewire detonator to understand the underlying mechanism.

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. Retrieved from ” https: The results of the bew work will be presented, together with the implications for the initiation mechanism of PETN in an dteonator bridgewire detonator.

Exploding-bridgewire detonator

Detonators without such booster are called initial pressing detonators IP detonators. Retrieved July ebbw, The heating rate is high enough that the liquid metal has no time to flow away, detonatlr heats further until it vaporizes. However, they require a bulky power source for the current surges required. Primary explosives such as lead azide are very sensitive to static electricity, radio frequency, shock, etc.

The time precision and consistency of EBWs 0.

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 to ebe the weapon. 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. Content from this work may be used under the terms of the Creative Commons Attribution 3.


This in turn has led to the calculation of the energy efficiency of the fireset bridgewire system and an estimate of the energy delivered post bridgewire burst. 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 detonatot Guidelines for the Export of Nuclear Material, Equipment and Technology.

By using this site, you agree to the Terms of Use and Privacy Policy. When the wire is connected across this voltage, the resulting high current melts and then vaporizes the wire in a few microseconds.

This site uses cookies. Archived from the original PDF on October 6, EBWs have found uses outside nuclear weapons, such as the Titan IV[5] safety conscious 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. This is roughly 1, to 10, times longer and less precise than the EBW electrical vaporization.

To find out more, see our Privacy and Cookies policy. 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. Buy edtonator article rbw print.

If the current rise rate is lower, the bridge may burn, perhaps causing deflagration of the PETN pellet, but it will not cause detonation. The resulting shock and heat initiate the high explosive.

This has led to their common use in nuclear weapons.