Dual-polarization layered magneto-optic sensor with spatiotemporal thermal-magnetic interference decoupling

Area of Science:

• Optoelectronics
• Sensor Technology
• Physics

Background:

• Stray magnetic fields and temperature fluctuations pose significant challenges for conventional magneto-optic current sensors (MOCS).
• Existing MOCS designs struggle with synchronous compensation for complex multiphysics interference.
• Accurate current measurement in harsh environments requires robust sensor solutions.

Purpose of the Study:

• To develop a layered, dual-polarization-state receiving MOCS for enhanced interference compensation.
• To investigate the sensor's capability for synchronous compensation of magnetic field vectors and temperature gradients.
• To provide a novel approach for addressing multiphysics coupling issues in optical sensors.

Main Methods:

• Utilized COMSOL multiphysics simulations to model and analyze sensor performance under interference.
• Designed a layered dual-polarization-state receiving structure for the MOCS.
• Conducted experimental validation under combined magnetic field and thermal cycling conditions.

Main Results:

• Simulations showed steady-state relative error below 0.2% and transient error below 1% under various interferences.
• Experimental results confirmed measurement accuracy below 0.2% with simultaneous 2800 µT magnetic fields and -40°C to +40°C thermal cycling.
• The proposed MOCS effectively compensated for spatial magnetic field vector interference and temperature gradients.

Conclusions:

• The developed layered MOCS offers a significant advancement in accurate current sensing within complex environments.
• This research presents a new paradigm for overcoming multiphysics coupling challenges in optical sensor technology.
• The sensor's robust performance demonstrates its potential for demanding industrial and scientific applications.