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Autoparametric Amplification of a Magnetic Induction Signal in a Magnetomodulating Meter with an Amorphous Ferromagnetic Core

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Abstract

A magnetomodulating meter of a magnetic field based on an LC circuit with a core made of an amorphous ferromagnetic alloy with compensated longitudinal magnetostriction operating in the autoparametric resonance mode is considered. The autoparametric resonance in an oscillating LC circuit is due to magnetoelastic interaction in the amorphous ferromagnetic core upon excitation by a weak high-frequency harmonic magnetic field. It is shown that the stable conversion factor of a 35-mm-long meter based on an LC circuit with autoparametric amplification at the modulation frequency of 256 kHz may equal 10 mV/nT or more, which makes it possible (with the existing element base) to record signals of a weak variable magnetic field with an amplitude of ~0.03 pT/Hz1/2 in the frequency range of 10–1000 Hz. Magnetomodulating meters with autoparametric amplification can be applied in geophysics, magnetobiology, and biomedicine.

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Authors and Affiliations

  1. Institute of Geophysics, Ural Branch, Russian Academy of Sciences, 620016, Yekaterinburg, Russia

    O. L. Sokol-Kutylovskii

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  1. O. L. Sokol-Kutylovskii
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Correspondence to O. L. Sokol-Kutylovskii.

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Translated by A. Sin’kov

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Sokol-Kutylovskii, O.L. Autoparametric Amplification of a Magnetic Induction Signal in a Magnetomodulating Meter with an Amorphous Ferromagnetic Core. Tech. Phys. Lett. 48, 234–236 (2022). https://doi.org/10.1134/S1063785022080041

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  • DOI: https://doi.org/10.1134/S1063785022080041

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