Resumen
The sensor e.g. fluxgate has a small, ferromagnetic and helical magnetic core, which measures the magnitude and direction of magnetic fields or continuous alternating fields of low frequency. The sensor consists of a tubular copper substrate of small sized polycrystalline, which is 1 centimeter long and 2 millimeter in diameter, and has two propellers of ferromagnetic material deposited by electrolysis in opposite directions.