Relationship between exploding bridgewire and spark initiation of low density PETN

Recent work has shown that the energy delivered after bridgewire burst affects the function time of an EBW detonator. The spark which is formed post bridgewire burst is the means by which the remaining fireset energy contributes to the reaction. Therefore, by studying the characteristics of spark-gap detonators, insight into the contribution of spark initiation to the functioning of EBW detonators may be achieved. Spark initiation of low density explosives consists of: (i) spark formation, (ii) spark interaction with the bed, and (iii) ignition and growth of reaction. Experiments were performed in which an inert simulant was used to study the formation and propagation of sparks as a function of spark energy. The effect of the spark on inert porous beds was studied over a limited delivered energy range. The disruption of the bed was found to be dependent on the energy delivered. The effect of spark initiation on a low density PETN bed was then examined, the relationship between delivered energy and functio...