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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Booster charge circled in green. Buy this article in print. 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 results of the experimental work will be presented, together with the implications for the initiation mechanism of PETN in an exploding bridgewire detonator. 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.
Closeup of a detonator set. The heating process typically takes milliseconds to tens of milliseconds to complete and initiate detonation in the primary explosive. The time precision and consistency of EBWs 0. Content from this work may be used under the terms of the Creative Commons Attribution 3. Modern exploding-bridgewire detonators arranged in a tray. Detonators Nuclear weapon design. An EBW has two main parts: Closeup with EBW highlighted. detojator
RP-1 EBW Detonator
The EBW is the Y-shaped device with two wires coming in at angles along the surface. Archived from the original PDF on October 6, The measurement of current, time to detohator burst and the transient voltage across the bridgewire at burst have enabled the determination of the energy used in bursting the bridgewire.
Conventional blasting caps detonaor electricity to heat a bridge wire rather than vaporize it, and that heating then causes the primary explosive to detonate.
RP EBW Detonator
However, there is still not a universally accepted mechanism. Retrieved July 14, This is roughly 1, to 10, times longer and less precise than the EBW electrical vaporization.
The resulting shock and heat initiate the high explosive. The most common commercial wire size dbw 0.
This paper is the first of three characterising the initiation of PETN in an exploding bridgewire detonator to understand the underlying mechanism. 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 detnator as a few tens of nanoseconds.
The Fat Man Model EBW detonators used an unusual, evw reliability detonator system with two EBW “horns” attached to a single booster charge, which then fired each of the 32 explosive lens units. A low energy density capacitor equivalent to a compression generator would be roughly the size of a soda can.
During initiation, the wire heats with the passing current until melting point is reached. Detonator wires highlighted in yellow. 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 deonator with little voltage drop, lest the EBW not achieve the phase transition quickly enough.
However, they require a bulky power source for the current surges required. To find out more, see our Privacy and Cookies policy. Low- impedance capacitors and low-impedance coaxial cables are required to sbw the necessary current rise rate.
Since detnoator invention there have been numerous studies to identify the mechanism by which the exploding bridgewire initiates the explosive.
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.
When the wire is connected across this voltage, the resulting high current melts ew then vaporizes the wire in a few microseconds. The exploding-bridgewire detonator Detohatoralso 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.
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 implosion must be highly symmetrical or the plutonium would simply be ejected at the low-pressure points.
Exploding Bridgewire EBW Detonators are in widespread use and have proven reliability and performance characteristics.