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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From the available explosives, only PETN at low densities can be initiated by sufficiently low shock to make its use practical in commercial systems as a part of the EBW initiator. This accounts for the heavy cables seen in photos of the Trinity ” Gadget “; high voltage cable requires good insulation and they detonxtor to deliver a large current with little voltage drop, lest the EBW not achieve the phase transition quickly enough.
Detonator wires highlighted in yellow. This is roughly 1, to 10, times longer and less precise than the EBW electrical vaporization. Detonators Nuclear weapon design. This paper is the first of three characterising the initiation of PETN in an exploding bridgewire detonator to understand the underlying mechanism.
This is achieved via conventional explosives placed uniformly around the pit.
A view on the functioning mechanism of EBW detonators -part 1: electrical characterisation
Modern exploding-bridgewire detonators arranged in a tray. Retrieved July 14, 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. However, there is still not a universally accepted mechanism.
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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. 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 ebs quarries. Two EBW arms circled in light green. 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 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.
Primary explosives such as lead azide are very sensitive to static electricity, radio frequency, shock, etc. The EBW is the Y-shaped device with two wires coming in at angles along the surface. Any further distribution detonaotr this work must maintain attribution to the author s and the title of the work, journal citation and DOI. 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.
Consequently, the detonators must have very precise timing. To find out more, detonaator our Privacy and Cookies policy. 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 cross the weapon.
Since their invention there have been numerous studies to identify the mechanism by which the exploding bridgewire initiates the detnator.
RP EBW Detonator
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. The extremely short rise times are usually achieved by discharging a low- inductancehigh-capacitance, high-voltage capacitor e.
E A Lee et al J. The slapper detonator is a more recent development along similar lines. A very rough approximation for the capacitor is a rating of 5 kilovolts and 1 microfarad, and the peak current ranges between and amperes. The larger round objects with two wires coming out parallel to the surface are diagnostic equipment.
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. EBWs dtonator a different physical mechanism than blasting caps, using more electricity delivered much more rapidly, and explode in a much more precise detinator after the electric current is applied, by the process of exploding degonator method.
Sign up for new issue notifications. Given a sufficiently high and well known amount of electric current and voltage, the timing of the bridgewire vaporization is detobator extremely short a few microseconds and extremely precise and predictable standard deviation of time to detonate as low as a few tens of nanoseconds.