Measurement of magnetic noise in magnetoimpedance sensing element
IMPEDANCE JSC, 124527 Zelenograd, Moscow, Russia
2 Scientific & Research Institute of Natural Gases and Gas Technologies – Gazprom VNIIGAZ, 142717 Razvilka, Leninsky District, Moscow Region, Russia
3 Decima LLC, 124498, Zelenograd, Moscow, Russia
* Corresponding author : firstname.lastname@example.org
Published online: 4 July 2018
A method for measurement of magnetic noise in magnetoimpedance sensing element is proposed. Glass-coated Co-based amorphous microwires with a slightly negative magnetostriction were used as the sensing element. The operation principle of the sensing element was based on the nonlinear off-diagonal magnetoimpedance, when field dependent higher harmonic components appeared in voltage in the pick-up coil wound around the microwire. The magnetic noise for the second harmonic in the pick-up coil voltage was studied. The dependences of the magnetic noise and the signal-to-noise ratio in the sensitive element on the current amplitude were analyzed. The noise performance of the second harmonic in the pick-up coil voltage was compared to that for a flux-gate sensing element.
© The Authors, published by EDP Sciences, 2018
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