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Title: Magnetoelectric intrinsic gradiometer with high detection sensitivity and ambient noise rejection
Authors: Zhang, M
Or, SW 
Yip, YM
Keywords: Ambient noise rejection
Intrinsic gradiometer
Magnetic field gradient
Magnetoelectric effect
Issue Date: 2017
Publisher: Institute of Electrical and Electronics Engineers Inc.
Source: Proceedings of IEEE Sensors, 2017, 7808505 How to cite?
Abstract: We report theoretically and experimentally the simultaneous realization of high detection sensitivity and high ambient noise rejection in an intrinsic gradiometer based on the giant magnetoelectric effect and the magnetic field gradient sensing technique in two specifically designed and arranged magnetoelectric magnetometers. The output voltage of the gradiometer is directly obtained from the intrinsic difference voltage between the two magnetoelectric magnetometers and is calibrated magnetic field gradient to give a high detection sensitivity of 3.2 mV/(Oe/m) and a high ambient noise rejection of 30 dB (equivalent to a noise level of 20 pT/√Hz at the natural resonance frequency of 120 kHz). The consistent characteristics of the magnetoelectric magnetometers result in almost zero non-linearity between the gradiometer output voltage and its magnetic field gradient over a broad range of frequency from 1 Hz to 170 kHz.
Description: 15th IEEE Sensors Conference, SENSORS 2016, Orlando, US, 30 October - 2 November 2016
ISBN: 9781479982875
ISSN: 1930-0395
DOI: 10.1109/ICSENS.2016.7808505
Appears in Collections:Conference Paper

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