ELF magnetic field receiver: frequency performance and natural signals detection
DOI:
https://doi.org/10.37537/rev.elektron.5.2.135.2021Keywords:
Loop antenna, ELF, magnetic fields, acquisition system, Schumann resonanceAbstract
This article presents the analog stage analysis of an extremely low frequency (ELF) magnetic field receiver. Details are described about the characterization and modeling of the antenna used, as well as the frequency behavior of the system. To achieve higher sensitivity, a coil was manufactured with a considerably high inductance (800 H), in addition to a high-gain amplification stage (88 dB). An equivalent circuit model was defined for the antenna, and its parasitic elements were determined by laboratory measurements and computational approximations. The acquisition system has a digitization stage with a sampling frequency of 100 Hz. To study its behavior against possible aliasing effects, an analysis of the analog stage in the frequency domain was carried out, determining the optimal operating conditions. Field tests of the equipment were carried out in the mountains of Villa Alpina, Cordoba, Argentina. Taking into account that the system was designed for the measurement and study of natural electromagnetic phenomena in the ELF band, the first six Schumann resonances have been successfully captured and detected.
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