A Giant Magneto-Strictive Material-Based Fabry-Perot Interferometer-Type 3D Vector Magnetic Field Sensor.

Area of Science:

• Optoelectronics
• Sensor Technology
• Materials Science

Background:

• Accurate magnetic field measurement is crucial for various applications.
• Existing sensors often lack the sensitivity or vector measurement capabilities required.
• Fiber optic sensors offer potential for high-performance magnetic field detection.

Purpose of the Study:

• To design and experimentally validate a highly sensitive vector magnetic field sensor.
• To achieve simultaneous measurement of magnetic field magnitude and direction.
• To enhance sensor sensitivity through novel material and optical configurations.

Main Methods:

• Utilizing three mutually orthogonal Fabry-Perot interferometers (FPIs) bonded to a giant magneto-strictive material (GMM) block.
• Leveraging magneto-strictively induced strain transfer from GMM to FPIs under an applied magnetic field.
• Employing CO2 laser modulation of SMF-HCF-SMF FPIs to enhance sensitivity.

Main Results:

• Achieved highest sensitivities of 245.13 pm/mT (X-Y), 159.06 pm/mT (X-Z), and 168.59 pm/mT (Y-Z).
• Demonstrated simultaneous determination of magnetic field magnitude and direction via wavelength drift demodulation.
• Validated the sensor's performance through experimental testing.

Conclusions:

• The developed sensor offers a highly sensitive and accurate method for vector magnetic field measurement.
• The integration of FPIs with GMM and laser modulation presents a promising approach for advanced magnetic sensing.
• This technology has potential applications in fields requiring precise magnetic field monitoring.