Research on the Technology for Suppressing Shupe Error of Fiber Optic Gyroscope Based on Structure that Integrates Thermal Conduction and Insulation

Abstract

Firstly, this paper determines that the main cause of the Shupe error is the temperature distribution gradient in the fiber coil that changes with time and space by studying the Shupe error mathematical model of fiber optic gyroscope (FOG). To solve this problem, according to the structural form and composition of the fiber coil, the equivalent physical property parameters of the fiber coil are analyzed and obtained, and the equivalent model of the fiber coil is established. Then, a variety of structural forms with different protective layers are designed for the optical fiber coil under the condition that space allows, such as thermal conduction layer and thermal insulation layer, and the finite element transient temperature field simulation analysis is performed for each structural form. The simulation results show that the optimal protective layer structure is that the inner layer is thermal conduction layer, and the outer layer is thermal insulation layer. Compared with the structure without protective layer outside the fiber coil, the temperature difference within the fiber coil is reduced from 9.32℃ to 0.5℃, and the average temperature rise of the fiber coil is reduced from33.34℃ to 4.26℃. Finally, a local heating experiment is performed on the FOG with such protective layer structure, and the results show that the zero bias stability of the FOG is improved from the original 0.0118°/h to 0.0055°/h, which is of great significance for improving the temperature performance of FOG.