Reliable & Flexible Electronic Safe and Arm Device
An Electronic Safe and Arm Device (ESAD) is designed for mission critical applications where a reliable arming and firing sequence with precise timing events is vital. Used for flight termination systems and rocket motor ignition, our ESADs meet the stringent requirements of RCC-319 and MIL-STD-1901A. Utilized with our bulk Destruct Charge or Linear Shaped Charge, our fully electronic device interfaces with a flight termination receiver, or mission controller, through a customizable input connector. This device outputs a high voltage firing current to initiate single or dual Low Energy Exploding Foil Initiators (LEEFIs). Our ESADs can be integral with the LEEFI energetic output or can initiate the LEEFIs through a high voltage flex tip. Also referred to as a high-energy electronic initiator firing unit, this device meets safety board requirements by incorporating two unique inhibits that must be satisfied prior to firing. Both “armed on the ground” and “armed after safe separation” approved variants are available.
The most recent pyro-technology type is the High Voltage Safe and Arm Device (HV SAD). Unlike all other safe and arm devices, it is an inline safe and arm, meaning, there is no physical block between the firing energy and the output pyrotechnic device. The output pyrotechnics for a HV SAD is an exploding foil initiator. For a high voltage safe and arm system to be considered a safety system, there are few requirements it must meet. It can only utilize insensitive secondary explosives. These are listed in MIL-STD-1316. And its initiator must require greater than 500 volts DC for initiation of the output. The two requirements are achieved by using what we call an exploding foil initiator (EFI). And the EFI is the fundamental enabling technology for the high voltage, safe and arm.
Sandia developed this enabling technology in the 90s, which does not depend on heat to ignite the pyrotechnic. Instead it uses an insensitive secondary explosive which is directly initiated with a high velocity detonation impact. The high velocity flyer is generated by discharging very high current (>1000A) through a small reactive semiconductor which then explodes and propels a tiny flyer at velocities greater the 3000m/s into the explosive pellet. Due to the insensitivity of this technology and the very specific electrical impulse required to fire it, the U.S. Safety Board community allowed for the use of an all-electronic firing system without the need for mechanical/physical barriers. Arming requires 3 MOSFETs to close in order to charge the
high voltage capacitor:
► Two Static
► One Dynamic
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