Temperature-Effects Compensation of Fiber-Optic Coils in Fiber-Optic Gyroscope-Based Precision Rotational Sensing

Temperature effects induced into the fiber-optic coil degrade the precision of rotational sensing by fiber-optic gyroscopes. To address this issue, this study investigates how temperature-field characterization and the layout of temperature sensor measurement points influence temperature-error compensation under practical constraints. Under a limited number of temperature sensors, we find that, compared with measuring the temperature distribution along the fiber-optic coil, prioritizing the characterization of temperature differences between the inner and outer regions of the fiber-optic coil achieves more effective temperature-error compensation. Based on this insight, a multi-scale temperature field characterization and nonlinear modeling of temperature errors method is introduced to address temperature-induced error mechanisms. The method is validated through time-varying temperature variation experiments. Experimental results demonstrate that the optimized sensor layout improves the compensation performance by 6.8 dB. This work provides a systematic investigation of sensor-layout optimization and multi-scale feature construction for temperature compensation under practical constraints, enabling fiber-optic gyroscope-based precision rotational sensing with improved environmental adaptability.