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Appl. Sci. 2017, 7(8), 755; doi:10.3390/app7080755

Development of a Magnetostrictive FeNi Coated Surface Acoustic Wave Current Sensor

1
China Electric Power Research Institute of State Grid, Beijing 100192, China
2
State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, No. 21, Beisihuan West Road, Beijing 100190, China
3
School of Electronic. Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Received: 7 July 2017 / Revised: 19 July 2017 / Accepted: 20 July 2017 / Published: 25 July 2017
(This article belongs to the Section Acoustics)
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Abstract

A magnetostrictive FeNi-coated surface acoustic wave (SAW)-based current sensor was proposed in this work. The weak remanence and hysteresis effect of the FeNi itself contributes to suppress the asymmetry in sensor response at increasing and decreasing current. The sensor response was simulated by solving the coupled electromechanical field equation in layered structure considering the magnetostrictive effect and an approach of effective dielectric constant. The effects from the aspect ratio and thickness of the FeNi film on sensor response were analyzed to determine the optimal design parameters. Differential oscillation structure was used to form the sensor, in which, the FeNi thin film was deposited along the SAW propagation of the sensor chip by using RF magnetron sputtering. The magnetostrictive effect of the FeNi coating induced by the magnetic loading generates the perturbation in SAW velocity, and corresponding oscillation frequency. High sensitivity of 10.7 KHz/A, good linearity and repeatability, lower hysteresis error of 0.97% were obtained from the developed prototype 150 MHz SAW FeNi coated current sensor. View Full-Text
Keywords: current sensor; differential oscillator; FeNi; magnetomechanics effect; surface acoustic wave current sensor; differential oscillator; FeNi; magnetomechanics effect; surface acoustic wave
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MDPI and ACS Style

Tong, J.; Jia, Y.; Wang, W.; Wang, Y.; Wang, S.; Liu, X.; Lei, Y. Development of a Magnetostrictive FeNi Coated Surface Acoustic Wave Current Sensor. Appl. Sci. 2017, 7, 755.

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