Core Design for Flexible H-Sensor for ELF.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent describes a counterwound, magnetic core for a towed-cable helically wound, ELF antenna comprising a cylindrical, plastic, center insert, with or without a center conductor, with two strips or sets of strips of magnetic material counterwound about it so that a plurality of good-mechanical-contact, strip, crossover points are formed distributed around the circumference of the insert and down its length. An insulating material is then wrapped around these counterwound strips and a conductor helically wound around that. This design, by providing alternate flux paths down the core via the crossover points provides a lower, core reluctance and, when the core is under stress, provides a flux path that avoids the high-stress regions of the core thus reducing the amount of flux that is stress-modulated Thus a substantial magnetostrictive noise reduction is obtained.
- Electrical and Electronic Equipment