An Intensity-Demodulated Fiber-Optic Magnetometer Based on Nanostructured Magnetic Fluid-Filled Fluidic Photonic...

Area of Science:

• Optoelectronics
• Materials Science
• Sensor Technology

Background:

• Fiber-optic sensors offer advantages in harsh environments.
• Magnetic fluids exhibit tunable magneto-optical properties.
• Developing compact and cost-effective magnetometers is crucial for various applications.

Purpose of the Study:

• To propose and experimentally investigate an intensity-demodulated fiber-optic magnetometer.
• To utilize the magneto-optical properties of magnetic fluid for magnetic field detection.
• To evaluate the performance and characteristics of the fabricated sensor.

Main Methods:

• Fabrication of the fiber-optic magnetometer by fusion splicing a photonic crystal fiber (PCF) segment between single-mode fibers (SMFs).
• Filling the cladding air holes of the PCF with magnetic fluid.
• Monitoring changes in the transmission spectrum due to the external magnetic field.
• Converting optical signals to electrical signals for measurement.

Main Results:

• The fiber-optic magnetometer demonstrated an intensity-demodulated response to external magnetic fields.
• A sensitivity of 0.238 dB/mT was achieved at 1550.03 nm for a 5.5 cm PCF length.
• An electrical sensitivity of 0.003 V/mT was obtained after signal conversion.
• The device exhibited a simple fabrication process, compact and robust structure, and low cost.

Conclusions:

• The proposed intensity-demodulated fiber-optic magnetometer effectively detects magnetic fields using magnetic fluid.
• The sensor shows promising performance with high sensitivity and practical advantages.
• This technology offers a cost-effective and robust solution for magnetic field sensing.