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

Abstract

To address the technical challenges of stray magnetic field interference and temperature drift in straight-through MOCS, this study proposes a layered dual-polarization-state receiving magneto-optic current sensor. The device could achieve synchronous compensation for external spatial magnetic field vector interference and temperature gradient effects. COMSOL multiphysics simulations demonstrated that under various interference conditions, the steady-state relative error of the layered MOCS remained below 0.2%, whereas the transient relative error remained below 1%. Experimental validation demonstrated that the proposed sensor maintained a measurement accuracy below 0.2% under simultaneous interference conditions of 2800 µT external magnetic fields and thermal cycling from -40 °C to +40 °C. This research provides a novel paradigm for addressing the multiphysics coupling problems of optical sensors in complex environments.