Calibration of Magnetic Field Sensors up to 10 kHz Based on 50 Hz Helmholtz Coils

Ionel Dumbravă, Georgiana Roşu, Ion Pătru, Aurelia Scornea, Octavian Baltag, Andrei Marinescu

Abstract

Helmholtz coils (HC) are used to develop uniform magnetic fields for a variety of research applications. Helmholtz coils can be easily constructed and the fields easily calculated. This makes them especially useful in calibrating sensors and numerous other low-frequency magnetic-field testing applications. Such a calibration system with Helmholtz coils can be found in ICMET, operating at a frequency of 50 Hz. Recently, the issue was raised for calibration of certain measuring devices up to 10 kHz frequencies needed for measurement in industrial applications such as induction hardening of metal parts. The first part of the paper presents theoretical analysis on the volume confining the space where the magnetic field components have a predetermined deviation (a 2% threshold) from the center of the classical Helmholtz system followed by a comparison with a 3D FEM simulation and measurement of HC field. The second part describes the parameters identification and the resonant power supply used to significantly reduce the excitation output required for the Helmholtz coil system at these frequencies.

Keywords

Helmholtz coils, parameters, resonant supply, FEM model, uniform field volume

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IMEKO-TC4-2017-041.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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