Magneto-optical fiber sensor based on magnetic fluid.

Area of Science:

• Optoelectronics
• Fiber optic sensing
• Magnetometry

Background:

• Fiber optic sensors offer advantages like remote sensing and immunity to electromagnetic interference.
• Magnetic field sensing is crucial for various applications, including industrial monitoring and scientific research.
• Existing magnetic field sensors have limitations in sensitivity, resolution, or operating environment.

Purpose of the Study:

• To propose and demonstrate a novel magnetic field fiber sensor.
• To investigate the performance of a Sagnac interferometer-based sensor utilizing magnetic fluid.
• To achieve high sensitivity and resolution in magnetic field measurement using optical fiber technology.

Main Methods:

• A Sagnac interferometer structure was designed and fabricated.
• A magnetic fluid film and polarization-maintaining fiber were integrated into the fiber loop.
• The sensor's response to varying magnetic field strengths was measured by analyzing the interference spectrum shift and optical power variation.

Main Results:

• The sensor exhibited a sinusoidal interference spectrum.
• The interference spectrum shift showed a sensitivity of 16.7 pm/Oe.
• The sensor achieved a magnetic field resolution of 0.60 Oe.
• Optical power variation demonstrated a sensitivity of 0.3998 dB/Oe.

Conclusions:

• The proposed magnetic fluid-based Sagnac interferometer fiber sensor is effective for magnetic field measurement.
• The sensor demonstrates high sensitivity and resolution, making it suitable for practical applications.
• This novel sensor design offers a promising approach for advanced magnetic field sensing.