A METHOD FOR PROTECTING ELECTROEXPLOSIVE DEVICES FROM SPURIOUS ELECTRICAL INITIATION
NAVAL WEAPONS LAB DAHLGREN VA
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It is proposed to protect the EED from initiation from spurious signals by completely inclosing it in a metallic shield. To arm the device, a large dc current melts away the part of the shield that surrounds the firing leads to the EED. The novel feature is the use of a small silicon diode in series with the firing lead inside the shield to block the dc arming current from initiating the EED. An alternating current or a direct current of opposite polarity can then be used to fire the EED in the usual way at a later time. The advantage of separating the arming and firing functions is that the arming current may be made much larger than any available spurious signal. The firing sensitivity of the EED may be any value required by other design considerations such as limited available firing current. If the diode is not used, the fusible shunt merely lowers the EED sensitivity and firing occurs at arming.
- Safety Engineering
- Ammunition and Explosives