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Magnetoelectric Transverse Gradient Sensor with High Detection Sensitivity and Low Gradient Noise.

Mingji Zhang^1,2, Siu Wing Or^3,4

¹Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China. mingji.zhang@connect.polyu.hk.

Sensors (Basel, Switzerland)

|October 26, 2017

Summary

This summary is machine-generated.

A novel magnetoelectric (ME) sensor achieves high performance for detecting magnetic field gradients (MFGs). This passive sensor offers broadband detection capabilities, making it suitable for various applications.

Keywords:

ambient noise suppression baseline magnetic field gradient magnetoelectric effect transverse gradient sensor

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Area of Science:

Condensed Matter Physics
Materials Science
Sensor Technology

Background:

Magnetoelectric (ME) composites exhibit significant ME effects, enabling novel sensor applications.
Accurate detection of magnetic field gradients (MFGs) is crucial in various scientific and industrial fields.
Existing MFG sensors often face limitations in sensitivity, noise rejection, or operating frequency range.

Purpose of the Study:

To theoretically and experimentally realize a high-performance magnetoelectric (ME) transverse gradient sensor.
To leverage the large ME effect and MFG technique for enhanced detection capabilities.
To investigate the sensor's performance metrics, including sensitivity, noise, and nonlinearity.

Main Methods:

Utilized a pair of magnetically-biased, electrically-shielded, and mechanically-enclosed ME composites in a transverse orientation.
Employed an axial separation between the ME composites to measure the difference in ME voltage induced by transverse MFGs.
Calibrated the sensor against transverse MFGs and analyzed experimental gradient noise spectra.

Main Results:

Achieved high detection sensitivity ranging from 0.4 to 30.6 V/(T/m).
Demonstrated strong common-mode magnetic field noise rejection (> -14.5 dB) and low input-output nonlinearity (< 10 ppm).
Observed low gradient noise (0.16-620 nT/m/√Hz) across a broad frequency range (1 Hz-170 kHz) with a small baseline (35 mm).

Conclusions:

The novel ME transverse gradient sensor exhibits high detection performance, suitable for passive and direct MFG detection.
The sensor's performance is attributed to the large ME effect in the composites and the MFG technique.
Identified noise sources including pink noise, dielectric loss noise, power-frequency noise, and circuit noise.