This paper presents a miniaturized magnetic induction sensor (MMIS), where geomagnetism and high rpm rotation of ammunition are used to detect the turn number of the ammunition for applications to small-caliber turn-counting fuzes. The MMIS, composed of cores and a coil, has a robust structure without moving parts to increase the shock survivability in a gunfire environment of ~30,000 g’s. The ...

As New Zealander geophysicist Gillian Turner’s book North Pole, South Pole: The Epic Quest to Solve the Great Mystery of Earth’s Magnetism [1] shows, our planet’s magnetic properties have intrigued people since a...