Power Line Field Discrimination Method for Magnetic Sensors.
Abstract
The discriminator consists of two major parts; a nonlinear filter for low level rejection, and inhibiting logic for high level rejection, of ac magnetic fields. The nonlinear filter approximately halves the frequency characteristics of a particular class of signals, while at the same time doubling the frequency of normal interfering signals. The inhibiting logic uses the known in-phase relationship to sense and reject even very large time dependent interference. However, spatially variant signals observed from near field relative motion of two orthogonal magnetic sensors with respect to a ferro-magnetic object have a near quadrature relationship that permits signal recognition even when of less amplitude than the interference. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 18, 1981
- Accession Number
- ADD008913
Entities
People
- James W. Mckelvy
- Walter E. Miller Jr.
Organizations
- United States Army