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A Method for Increasing the Sensitivity of Magnetoimpedance Magnetic Field Sensors

  • ELECTROMAGNETIC METHODS
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Abstract

The possibility of increasing the sensitivity of magnetoimpedance (metal) magnetic field sensors by including a high-frequency resonant circuit is considered. Various schemes of resonant circuits are presented, allowing one to increase the sensitivity of a metal magnetoimpedance sensor at a frequency of 75 MHz. The best results were obtained for a Q multiplication circuit that increases the transmission coefficient of the sensor from the external magnetic field strength from 31 to 132%/Oe with a narrowing of the bandwidth to 2.5 MHz, which results in an increase of the signal-to-noise ratio by an order of magnitude. This approach using quadrature demodulation of the signal makes it possible to distinguish signals of an alternating magnetic field with an amplitude of 1 nT with a signal-to-noise ratio of 10 dB. The proposed method can be applied for magnetoimpedance and magnetoresistive magnetic field sensors as well as for metal strain gauges during highly sensitive measurements.

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Funding

This work was supported by the Russian Foundation for Basic Research, project no. 20-48-660044.

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Authors and Affiliations

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

    S. V. Shcherbinin & I. V. Beketov

  2. Ural Federal University, 620002, Yekaterinburg, Russia

    S. V. Shcherbinin, I. V. Beketov & K. A. Yarushin

Authors
  1. S. V. Shcherbinin
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  2. I. V. Beketov
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  3. K. A. Yarushin
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Correspondence to S. V. Shcherbinin.

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Shcherbinin, S.V., Beketov, I.V. & Yarushin, K.A. A Method for Increasing the Sensitivity of Magnetoimpedance Magnetic Field Sensors. Russ J Nondestruct Test 58, 1118–1128 (2022). https://doi.org/10.1134/S1061830922700127

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  • DOI: https://doi.org/10.1134/S1061830922700127

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