How Exploding Foil Initiators Work
A high voltage pulse applied to the EFI provides the energy and shock needed to detonate insensitive secondary explosives, which further enhances their safety. An electrical stimulus in excess of 500 volts is required to function an EFI, providing enhanced safety in many critical applications, such as rocket motor ignition and warhead initiation. Function times are typically much less than one microsecond. The EFI is an improvement over the similar Exploding Bridge Wire (EBW) detonator with more efficient detonation transfer, lower voltage initiation, increased safety, and the ability to initiate a greater variety of insensitive explosives.