Detection and Imaging of Magnetic Field in the Low-Frequency Regime Using a Ferromagnetic Thin Film Coated With a Thermo-Fluorescent Layer

Abstract

A novel and original method of LF magnetic field imaging is presented, that uses a magnetic thin film coated with fluorescent dye. Due to high permeability and consequent hysteresis losses, the film is heated by the field. As the fluorescence of the coated material is temperature-dependent, magnetic field mapping can be obtained in a short time and on a large surface by recording images with a S-CMOS camera. This principle had been previously presented in the microwave regime, for both electric and magnetic fields imaging; here we propose first results in the low frequency regime (kHz frequency range). Index Terms-Magnetic field imaging, thermography, thermo-fluorescence, magnetic coil I.