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/√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.
No takes yet. Share an insight, caveat, or question.
Shen et al. (2018) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: