Broadband high-sensitivity current-sensing device utilizing nonlinear magnetoelectric medium and nanocrystalline flux concentrator

• Published in: Review of scientific instruments Vol. 86; no. 9; p. 095005
• Main Authors: Zhang, Jitao, He, Wei, Zhang, Ming, Zhao, Hongmei, Yang, Qian, Guo, Shuting, Wang, Xiaolei, Zheng, Xiaowan, Cao, Lingzhi
• Format: Journal Article
• Language: English
• Published: United States 01.09.2015
• ISSN: 1089-7623
• DOI: 10.1063/1.4930150

A broadband current-sensing device with frequency-conversion mechanism consisting of Terfenol-D/Pb(Zr.Ti)O3 (PZT)/Terfenol-D magnetoelectric laminate and Fe73.5Cu1Nb3Si13.5B9 nanocrystalline flux concentrator is fabricated and characterized. For the purpose of acquiring resonance-enhanced sensitivity within broad bandwidth, a frequency-modulation mechanism is introduced into the presented device through the nonlinearity of field-dependence giant magnetostrictive materials. The presented configuration provides a solution to monitor the weak currents and achieves resonance-enhanced sensitivity of 178.4 mV/A at power-line frequency, which exhibits ∼3.86 times higher than that of direct output at power-line frequency of 50 Hz. Experimental results demonstrate that a weak step-change input current of 1 mA can be clearly distinguished by the output amplitude or phase. This miniature current-sensing device provides a promising application in power-line weak current measurement.