Fabrication and Characterization of High-Performance Polymer-Based Magnetoelectric DC Magnetic Field Sensors Devices

作者：Reis Silvia; Castro Nelson; Silva Marco P; Correia Vitor; Rocha Jose Gerardo; Martins Pedro; Lanceros Mendez Senentxu

来源：IEEE Transactions on Industrial Electronics, 2017, 64(6): 4928-4934.

DOI：10.1109/TIE.2017.2668989

• Magnetic devices
• magnetoelectric effects
• smart sensors

The development of a DC magnetic field sensor based on a magnetoelectric (ME) PVDF/Metglas composite is reported. The ME sensing composite has an electromechanical resonance frequency close to 25.4 kHz, a linear response (r(2) = 0.997) in the 0-2 Oe DC magnetic field range, and a maximum output voltage of 112 mV (ME voltage coefficient alpha(33) of approximate to 30 V . cm(-1) . Oe(-1)). By incorporating a charge amplifier, an AC-RMS converter and a microcontroller with an on-chip analog-to-digital converter, the ME voltage response is not distorted, the linearity is maintained, and the ME output voltage increases to 3.3 V (alpha(33effective) = 1000 V . cm(-1) . Oe(-1)). The sensing device, including the readout electronics, has a maximum drift of 0.12 Oe with an average total drift of 0.04 Oe, with a sensitivity of 1.5 V . Oe(-1) (15 kV . T-1), and a 70 nT resolution. This feature is for the first time reported on a polymer-based ME device and compares favourably with a reference Hall sensor that showed a maximum drift of 0.07 Oe and an average error of 0.16 Oe, 5 V . T-1 sensitivity, and 2 mu T resolution. Such properties allied to the accurate measurement of the DC magnetic field (HDC) in the 0-2 Oe range make this polymer-based device very attractive for applications, such as Earth magnetic field sensing, digital compasses, navigation, and magnetic field anomaly detectors, among others.

• 出版日期2017-6