A Man-Portable Magnetoelectric DC Magnetic Sensor With Extremely High Sensitivity

This letter presents an advanced 3-axis portable dc magnetic sensor unit consisting of magnetoelectric (ME) composites and a custom lock-in amplifier circuit, which has extremely high sensitivity and detection resolution. The Metglas/Pb(Zr,Ti)O3 ME composites driven by a lock-in amplifier circuit ex...

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Veröffentlicht in:	IEEE electron device letters 2018-09, Vol.39 (9), p.1417-1420
Hauptverfasser:	Shen, Ying, Ma, Dingyi, Gao, Junqi
Format:	Artikel
Sprache:	eng
Schlagworte:	Amorphous magnetic materials Composite materials Defects Frequency measurement Geomagnetic field Geomagnetism Lead zirconate titanates Lock in amplifiers lock-in circuit Magnetic fields magnetic sensor Magnetic sensors Magnetoelectric Magnetometers Portability resolution Sensitivity Sensors Zirconium
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Zusammenfassung:	This letter presents an advanced 3-axis portable dc magnetic sensor unit consisting of magnetoelectric (ME) composites and a custom lock-in amplifier circuit, which has extremely high sensitivity and detection resolution. The Metglas/Pb(Zr,Ti)O3 ME composites driven by a lock-in amplifier circuit exhibit a high sensitivity of 5 V/Oe. Moreover, the equivalent magnetic noise of the unit is limited to 128 pT/ \surd Hz at 1 Hz. Therefore, a dc magnetic field as small as 1 nT can be sensed directly in the time domain. The entire 3-axis dc magnetic sensor is portable and energy-efficient, making it promising for magnetic navigation applications based on sensing variations in the magnitude and orientation of local geomagnetic fields.
ISSN:	0741-3106 1558-0563
DOI:	10.1109/LED.2018.2858280