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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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. The slapper detonator is a more recent development along similar lines. This is achieved via conventional explosives placed uniformly around the pit.
The extremely short rise times are usually achieved by discharging a low- inductancehigh-capacitance, high-voltage capacitor e. Archived from the original PDF on October 6, Detonator wires highlighted in yellow.
The larger round objects with two wires coming out parallel to the surface are diagnostic equipment. EBWs have ebww 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.
When fired, it creates a strong electromagnetic pulsewhich is inductively coupled into one or more secondary coils connected to the bridge wires or slapper foils. Views Read Edit Dstonator history.
Since explosives detonate at typically 7—8 kilometers per second, or 7—8 meters per millisecond, a detonafor 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 cross the weapon. To find out more, see our Privacy and Cookies policy.
RP EBW Detonator
Closeup with EBW highlighted. During initiation, the wire heats with the passing current until melting point is reached. In a fission bomb, the same or similar circuit is used for powering the neutron triggerthe initial source of fission neutrons. Detonators without such booster are called initial pressing detonators IP detonators.
Since their invention there have been numerous studies to identify the mechanism by which the exploding bridgewire initiates the explosive. Modern exploding-bridgewire detonators arranged in a tray.
This page detnoator last edited on 31 Octoberat The resulting shock and heat initiate the high explosive.
A view on the functioning mechanism of EBW detonators -part 1: electrical characterisation
Detobator the current rise rate is lower, the bridge may burn, perhaps causing deflagration of the PETN pellet, but it will not cause detonation.
Consequently, the detonators must have very precise timing. Retrieved July 14, The flux compression generator is one alternative to capacitors. However, there is still not a universally accepted mechanism.
The precise timing of EBWs is achieved by the detonator using direct physical effects detomator the vaporized bridgewire to initiate detonation in the detonator’s booster charge. Primary explosives such as lead azide are very sensitive to static electricity, radio frequency, shock, etc. This has led to their common use in nuclear weapons.
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. Closeup of a detonator set. The heating process typically takes milliseconds to tens of milliseconds to complete and initiate detonation in the primary explosive. When the wire is connected across this voltage, the resulting high current melts and then vaporizes the wire in a few microseconds.
Conventional blasting caps use electricity to heat a bridge wire rather than vaporize it, and that heating then causes the primary explosive to detonate.
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. 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.
The implosion must be highly symmetrical or the plutonium would simply be ejected at the low-pressure points. This is sufficiently precise for very low tolerance applications such as nuclear weapon explosive lenses.