Core design for flexible H-sensor for ELF
US3932872A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1974 |
| Grant date | Jan 13, 1976 |
| Priority date | — |
| Expiry date | Dec 23, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q7/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A counterwound, magnetic core for a towed-cable, helically wound, ELF anta 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.