Optimization Design of Miniaturized Fiber Ring Based on PM-IFOG Optical Path Physical Model

Abstract

Fiber optic ring is one of the key factors that determine the performance of interferometric fiber optic gyroscopes. To realize miniaturization of interferometric fiber optic gyroscopes, it is necessary to optimize the design of fiber optic ring in terms of volume and length according to performance requirements. At present, the production of small interferometric fiber optic gyroscopes is relatively rough in the selection of fiber optic ring length and has not been optimized. Based on the physical model of PM-IFOG optical path, this paper compares the effects of different lengths of fiber loops on the performance of small interferometric fiber optic gyroscopes, and adopts the methods of fiber loop performance simulation and length optimization design to improve the performance of small interferometric fiber optic gyroscopes. On the basis of miniaturization of fiber optic gyroscope, the length of 180m fiber optic loop is optimally designed to 290m. Through theoretical analysis and estimation, the accuracy of the gyroscope is improved by [0.259 (°)/h, 1σ)], and the zero bias stability is improved by 0.274 (°)/h. The results show that the application adaptability of interferometric fiber optic gyroscopes can be improved by reasonably designing the fiber optic ring length of small fiber optic gyroscopes. The research provides a certain reference value for miniaturization design of optical path of fiber optic gyroscope.