AC/DC transfer method for an AC magnetic flux density standard

Several methods for assuring a reference alternating (AC) magnetic field (densities up to few mT and frequencies up to 10 kHz) inside an air-cored coil are currently used (inductive pick-up coils, Hall magnetometer, fluxgate magnetometer). But irrespective of the method used, the measuring uncertain...

Full description

Saved in:
Bibliographic Details
Published in:Measurement science & technology 2005-08, Vol.16 (8), p.1656-1659, Article 1656
Main Authors: Humar, Janez, Fefer, Dušan, Geršak, Gregor
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Several methods for assuring a reference alternating (AC) magnetic field (densities up to few mT and frequencies up to 10 kHz) inside an air-cored coil are currently used (inductive pick-up coils, Hall magnetometer, fluxgate magnetometer). But irrespective of the method used, the measuring uncertainty of the reference AC magnetic field standard is always larger then the uncertainty of a reference direct (DC) magnetic field standard. The method proposed in this paper uses this fact. It employs a comparison between an unknown AC and a known DC magnetic field, generated by a Helmholtz coil, calibrated by means of a NMR (nuclear magnetic resonance) magnetometer. The basic idea of the method is to use a simple semiconductor magnetic sensor as a comparison medium. The purpose of this paper is the introduction of the common AC/DC transfer method into the field of magnetic flux density measurements, building an AC magnetic flux density standard, and evaluating its measuring uncertainty.
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/16/8/017