Helically Wound Permalloy Tape Cores for ELF Antennas.
Abstract
An experimental study of the properties of helically wound permalloy tape cores shows that to obtain a combination of high signal sensitivity together with low stress sensitivity the tape core should be of small diameter, should be built up from a number of thin tapes rather than one thick one and should be wound at a helix angle lying in the region 55 degrees to 60 degrees and to be determined experimentally. The small diameter reduces the thermal noise of the enclosing signal winding. The thin tapes are less heavily worked mechanically when they are wound, and so retain more of their as-annealed permeability. The special helix angle is the one for which stress sensitivity is zero.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 21, 1974
- Accession Number
- ADA002316
Entities
People
- Michael L. Burrows
Organizations
- Massachusetts Institute of Technology