High-speed imaging captures blast initiation

The development of new detonation systems requires diagnostic imaging techniques capable of accurately characterizing detonator functionality.

Th Snap Initiator 0908vsd

The development of new detonation systems requires diagnostic imaging techniques capable of accurately characterizing detonator functionality. Using a SIM-8 ultrahigh-speed framing camera, Specialised Imaging (Tring, UK; www.specialised-imaging.com) has demonstrated such a system.

Th Snap Initiator 0908vsd
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Applied to short-duration electrical-pulse detonators such as the exploding bridge wire and exploding foil initiator, the technique allows initiation of secondary explosives to be done with a higher level of safety, repeatability, and reliability than is achievable with hot wire detonators.

A spark source was placed behind the event to produce a pseudo-schlieren imaging system able to see through the bright flash produced by an exploding blast initiator that normally obscures the ejection of the disc and fragments. Framing data (50-ns exposures, 250-ns separation) is presented that clearly shows the shock waves from the blast as well as the ejected fragments.

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