proximity fuse

World English Dictionary
proximity fuse
 
n
an electronically triggered device designed to detonate an explosive charge in a missile, etc, at a predetermined distance from the target

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Encyclopedia Britannica
Encyclopedia

proximity fuse

an explosive ignition device used in bombs, artillery shells, and mines. The fuze senses when a target is close enough to be damaged or destroyed by the weapon's explosion. The sensor is typically a small radar set that sends out signals and listens for their reflections from nearby objects.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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