Exploding Bridgewire Detonator and Arc Initiation Detonator Comparison

We have studied the function of both standard exploding bridgewire (EBW) and modified arc initiation detonators in order to understand how the input to the initial pressing explosive powder (IP) leads to detonation. Standard EBW detonators function with a bridgewire which is heated rapidly through melt/vaporization. The initiation of detonation in the surrounding low density explosive powder of the IP has been attributed to both shock and thermal pathways. In this study, we compare the function of EBW detonators with bridgewires to a modified design where the bridgewire does not present a continuous circuit. Without this wire, the application of power to the pins causes an arc across the pins when sufficient voltage is applied. This arc then initiates detonation in the IP. The comparison of observables including voltage, current flow, light emission, density, and temperature between the bridgewire detonators and the bridgeless arc initiated detonators teaches us about function of both. Results of both studies will be described and lessons learned from the comparison discussed.