Novel Giant Magnetoimpedance Magnetic Field Sensor

Area of Science:

• Materials Science
• Sensor Technology
• Instrumentation

Background:

• The development of highly sensitive and stable magnetic sensors is crucial for various applications.
• Existing sensor technologies often face limitations in accuracy, drift, and response time.

Purpose of the Study:

• To present the concept, design, and testing of a novel Giant Magnetoimpedance (GMI) sensor.
• To demonstrate the effectiveness of a compensation measurement principle for null detection.
• To optimize material properties for enhanced sensor performance.

Main Methods:

• Utilized the local 'zero-field' minimum of a double-peak characteristic as a sensitive null detector.
• Implemented microprocessor-based, two-step, quasi-Newtonian optimization for real-time compensation field application.
• Optimized material parameters through Joule-annealing of amorphous alloys.

Main Results:

• The prototype GMI sensor exhibited a linear output characteristic.
• Achieved low measurement uncertainty.
• Demonstrated significant resistance against time and temperature drift.

Conclusions:

• The novel GMI sensor design based on the compensation measurement principle is effective.
• The developed optimization technique ensures real-time, accurate sensor operation.
• The sensor shows promising performance for reliable and stable magnetic field measurements.