Electro-mechanical vs. Electronic Safe and Arm Devices
Pacific Scientific Energetic Materials Company
When Milliseconds Matter
What are Safe and Arm Devices?
A Safe and Arm Device (SAD) controls the initiation of a pyrotechnic device such that the energetic output is fired only when commanded and is safe at all other times. It’s a device that prevents inadvertent arming or firing of a pyrotechnic event and makes the system is insensitive to environmental stimulus, such as fires, electro-magnetic fields, stray voltages and?electro-static discharge.
Electro-mechanical Safe & Arm Devices
Definition
This device is constructed out of aluminum alloy and mitigates the hazards associated with the initiation of explosives by preventing inadvertent initiation while at the same time assuring the ordnance will detonate on command and only when commanded.
How It Works
With the Electro-Mechanical Safe and Arm Device, a low voltage?bridgewire initiator is integrated internally?to the SAD and a mechanical device physically moves or rotates?the initiator.
When the SAD is in the SAFE position the device is intrinsically safe from Safe Arm Device inadvertently initiating the connected explosive train. In the SAFE position, the detonator is both electrically and mechanically isolated (rotated out-of-line with the output port) from any electrical inputs and explosive train outputs providing the needed intrinsic safety. The ESAD is commanded to the ARM state when the arming circuit is energized with the required input voltage pulse.
In the ARM state, the EED is rotated to the ESAD output port putting it in line with the explosive ordnance train. Once in the ARM state, the Electro-mechanical Safe and Arm Device can be initiated when the required electrical input stimulus is provided to the EED firing circuit.
Key Features
Applications
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Electronic Safe & Arm Devices
Definition
This fully electronic device is commanded to terminate a vehicle flight when it is off course or in an unsafe condition. This is achieved with the use of a Bulk Destruct Charge or Linear Shaped Charge.
How It Works
After arming and upon receipt of terminate command, the ESAD produces a high voltage firing current which detonates an Exploding Foil Initiator (EFI). The EFI then transfers that detonation into the Flight Termination Destruct Charge.
To provide maximum safety, the ESAD requires 2 independent and verifiable inhibits before the unit can arm the high voltage firing circuitry.
Key Features
Applications
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