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Self-Biased Bidomain LiNbO3/Ni/Metglas Magnetoelectric Current Sensor.

Mirza I BichurinRoman V PetrovViktor S LeontievOleg V SokolovAndrei V TurutinVictor V KutsIlya V KubasovAlexander M KislyukAlexander A TemirovMikhail D MalinkovichYuriy N Parkhomenko
Published in: Sensors (Basel, Switzerland) (2020)
The article is devoted to the theoretical and experimental study of a magnetoelectric (ME) current sensor based on a gradient structure. It is known that the use of gradient structures in magnetostrictive-piezoelectric composites makes it possible to create a self-biased structure by replacing an external magnetic field with an internal one, which significantly reduces the weight, power consumption and dimensions of the device. Current sensors based on a gradient bidomain structure LiNbO3 (LN)/Ni/Metglas with the following layer thicknesses: lithium niobate-500 μm, nickel-10 μm, Metglas-29 μm, operate on a linear section of the working characteristic and do not require the bias magnetic field. The main characteristics of a contactless ME current sensor: its current range measures up to 10 A, it has a sensitivity of 0.9 V/A, its current consumption is not more than 2.5 mA, and its linearity is maintained to an accuracy of 99.8%. Some additional advantages of a bidomain lithium niobate-based current sensor are the increased sensitivity of the device due to the use of the bending mode in the electromechanical resonance region and the absence of a lead component in the device.
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