Abstract
tic resonance (Fig. 2, 2), at the second harmonic of the excitation frequency was compared with the output signal of a control element with an ordinary core. The element that was tuned to resonance gave a signal that was 40 times greater than the control with a reduction of magnetic noise by a factor of two or three and approximately the same instability. The magnetic noise and the instability of the readings of the compared elements were monitored with a Unipan 232B phase-sensitive nanovoltmeter in the electromagnetic field of a ferromagnetic shield. The effect of an increase in sensitivity by tuning to low-frequency magnetoacoustic resonance is caused by an increase in the coherence of the conversion processes, when excitation energy is pumped into the system, intensifying the matched processes and supressing parasitic oscillations [I0].
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