Three-Axis Vector Magnetometer with a Three-Dimensional Flux Concentrator.

Area of Science:

• Sensor Technology
• Magnetometry
• Applied Physics

Background:

• Traditional fluxgate magnetometers often struggle with spatial orientation and require precise coil alignment.
• Integrating three-dimensional components onto planar structures presents assembly and reliability challenges.

Purpose of the Study:

• To develop a compact, reliable magnetic field sensor with spatial orientation capabilities.
• To enhance the sensitivity and accuracy of fluxgate magnetometers for three-axis vector field measurements.

Main Methods:

• A novel three-dimensional magnetic flux concentrator was designed and integrated with planar magnetic cores on a printed circuit board.
• Second harmonic signals from selected sensing coil pairs were utilized for three-axis sensing.
• The sensor's performance was characterized, including its linear range and sensitivity across different axes.

Main Results:

• The proposed sensor demonstrated a linear range up to 130 μT.
• Measured sensitivities were 257.1 V/T (X-axis), 468.8 V/T (Y-axis), and 258.8 V/T (Z-axis) at 50 kHz excitation.
• The design reduced alignment errors and improved sensor reliability.

Conclusions:

• The developed magnetic field sensor offers spatial orientation ability using a single sensing mechanism.
• Its performance characteristics make it suitable for Internet of Things (IoT) applications, particularly for mechanical posture and position assessment.