MIL-STD-1901A
3.9 Igniter charge. A source of heat and pressure that actually ignites the motor propellant.
3.10 Ignition safety device (ISD). A device that is an integral part of the munition whose purpose is to prevent an unintended functioning of the rocket or missile motor through interruption of the pyrotechnic train, interruption of the firing energy train, or control of the energy required to arm the ISD and function the initiator.
3.11 Ignition system (IS). The aggregate of devices in a weapon system, including those in the munition, launcher and munition launch platform (e.g., fire control system, armament control unit), which control the arming and firing signals to cause the munition propulsion system to function.
3.12 Independent safety feature. A safety feature is independent if its integrity is not affected by the functioning or malfunctioning of the other safety features.
3.13 Initiator. The component or components which convert the firing energy resulting in initiation of the first explosive or pyrotechnic element, even in the case of a distributed system where the energy conversion may occur at some distance and in a physically different module from the explosive or pyrotechnic element. The first explosive or pyrotechnic element of the explosive train will always be considered as part of the initiator. Examples of Initiators include but are not limited to:
a. Exploding Bridgewire (EBW) devices;
b. Semi-Conductor Bridge (SCB) initiators;
c. Laser diodes, the first component of the explosive or pyrotechnic train, and the in between (transfer) components;
d. Exploding Foil Initiators (EFI) including the bridge and explosive component;
e. Stab Detonators.
3.14 Interrupted firing energy train. A firing energy train with its elements physically and functionally separated until arming to interrupt the firing energy path and thus prevent ignition of the first element of a non-interrupted pyrotechnic train in the event of unintended activation of any sensitive element in the firing energy train (e.g., low voltage laser diodes).
3.15 Interrupted pyrotechnic train. A pyrotechnic train (see 3.18) with elements of the train physically and functionally separated until arming to interrupt the firing path and thus prevent ignition of the motor propellant in the event of unintended ignition of any sensitive element of the train.
3.16 Maximum no-fire stimulus (MNFS). The stimulus level at which the initiator will not fire or unsafely degrade with a probability of .995 at a confidence level of 95%. Stimulus refers to characteristic(s) such as current, rate of change of current (di/dt), power, voltage, or energy which is (are) most critical in defining the no-fire performance of the initiator.
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