AC/DC dual-mode magnetoelectric sensor with high magnetic field resolution and broad operating bandwidth

AC/DC dual-mode magnetoelectric sensor with high magnetic field resolution and broad operating bandwidth

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In this study, a dual-mode Metglas/Pb(Zr,Ti)O3 magnetoelectric (ME) sensor was prepared 1f2 paint for measuring weak magnetic fields.It is interesting to note that this ME sensor can work at alternating current (AC) and direct current (DC) dual-modes with high field resolution.In AC mode, a very accurate AC magnetic field resolution of 0.

8 nT was achieved at a mechanical resonance frequency of 72.2 kHz; moreover, the operating frequency band for resolution better than 1 nT is as wide as 3.4 kHz.

We proposed a DC bias field perturbation (DBFP) method to detect the DC magnetic field using lock-in amplifier technology.As a result, an ultra-accurate DC field resolution of 0.9 nT with noise power spectral density as low as 100 pT/Hz was obtained in the studied ME sensor via the DBFP method.

The dual-mode ME sensor enables simultaneous measurement for DC and AC luhta henttola magnetic fields with wideband and accurate field resolution, which greatly enhances the measurement flexibility and application scope.