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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Primary explosives such as lead azide are very sensitive to static electricity, radio frequency, shock, etc. Conventional blasting caps use electricity to heat a bridge wire rather than vaporize it, and that heating then causes the primary explosive to detonate.
Content from this work may be used under the terms of the Creative Commons Attribution 3. Any further distribution of this work must maintain attribution to the author s and the title of the work, journal citation and DOI. 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.
This is achieved via conventional explosives placed uniformly around the pit. The most common commercial wire size is 0. Archived from the original PDF on October 6, This is sufficiently precise for very low tolerance applications such as nuclear weapon explosive lenses.
In a fission bomb, the same or similar circuit is used for powering the neutron triggerthe initial source of fission neutrons. Closeup of a detonator set.
A view on the functioning mechanism of EBW detonators -part 1: electrical characterisation
Imprecise contact between the bridgewire and the primary explosive changes how quickly the explosive is heated up, and minor electrical variations in the wire or leads will change how quickly it heats up as well.
This has led to their common use in nuclear weapons. Sign up for new issue notifications. This paper is the first of three characterising the initiation of PETN in an exploding bridgewire detonator to understand the underlying mechanism. The EBW is the Y-shaped device with two wires coming in at angles along the surface. Booster charge circled in green. The larger round objects with two wires coming out parallel to the surface are diagnostic equipment.
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.
RP-1 EBW Detonator
A very rough approximation for the capacitor is a rating of 5 kilovolts and 1 microfarad, and the peak current ranges between and amperes. 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.
Modern exploding-bridgewire detonators arranged in a tray. Buy this article in detonatlr. The resulting shock and detonatlr initiate the high explosive.
Exploding Bridgewire EBW Detonators are in widespread use and have proven reliability and performance characteristics. The flux compression generator is one alternative to capacitors. 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 cetonator to cross the weapon.
Since their invention there have been numerous studies to identify the mechanism by which the exploding bridgewire initiates the explosive.
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.
Closeup with EBW highlighted. EBWs have found uses outside nuclear weapons, such as the Titan IV 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. Detonators without such booster are called initial pressing detonators IP detonators.
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 detonaror deviation of time to detonate as low as a few tens of nanoseconds. When the wire is connected across this voltage, the resulting high current melts and then vaporizes the wire in a few microseconds. During this phase the electrical resistance of the bridgewire assembly rises.
RP EBW Detonator
The time precision and consistency of EBWs 0. The heating rate is high enough that the liquid metal has detonatof time to flow away, and heats further until it vaporizes. 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.