Abstract

RESTREPO-ALVAREZ, Andrés Fernando; FRANCO-MEJIA, Edinson; CADAVID-RAMIREZ, Héctor  and  PINEDO-JARAMILLO, Carlos Rafael. A simple geomagnetic field compensation system for uniform magnetic field applications. Rev.fac.ing.univ. Antioquia [online]. 2017, n.83, pp.65-71. ISSN 0120-6230.  https://doi.org/10.17533/udea.redin.n83a09.

In this paper a simple geomagnetic field compensation system for uniform magnetic field applications of low magnitude and frequency is presented. The compensation system is based on an array of Tri-axial Square Helmholtz (TSH) coils, an array of tri-axial Hall effect sensors and a microcontroller system in order to compensate the small variations of the ambient magnetic fields (magnitudes close to the geomagnetic field between 25 μT and 65 μT) on a volume of interest. The geomagnetic field experimentally obtained of 39.5 μT was compensated, achieving a uniform magnetic field of approximately zero. Finally, the proposed system emerges as a simple alternative for control and compensation of magnetic fields in several applications.

Keywords : Uniform magnetic field; square Helmholtz coils; tri-axial Hall effect sensors; magnetic field control; geomagnetic field compensation.

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