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proximity fuse[präk′sim·əd·ē ‚fyüz]
A fuse that detonates a warhead when the target is within some specified region near the fuse; radio, radar, photoelectric, or other devices may be used as activating elements. Also known as influence fuse; variable-time fuse; vt fuse.
A fuse in which the primary initiation occurs by remotely sensing the presence, distance, and/or direction of a target or its associated environment by means of a signal generated by the fuse or emitted by the target or by detecting a disturbance of a natural field surrounding the target.