Schematic diagram of the proposed current sensor.
Simulated magnetic field strength of the internal Terfenol-D is illustrated from various distances of the air gap when the strength of current through the sensor is assigned to 1 A.
Side view of the magnetic circuit of each divided segment.
Induced voltage as a function of ac current at the frequency of 50 Hz.
Resolution of the sensor to small current step-changes.
Time stability and uncertainty of the sensor within 72 h.
Induced voltage responses of the proposed current sensor and an induction coil as a function of the drive frequency of an applied vortex magnetic field for 1 Hz < f < 20 kHz; the coil has the same size as the proposed sensor and is wrapped around the current-carrying conductor for comparison.
Material parameters of Terfenol-D, PZT, and FeCuNbSiB.
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