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为进一步提高干涉型光纤陀螺(IFOG)的Shupe效应非互易相移的计算精度,在柱坐标系中,根据热传递的原理和过程,以1匝光纤线圈为基本单位,在MATLAB平台上建立了随着轴向、径向和时间变化的IFOG的三维温度场分布模型。根据Shupe效应的原理,基于光波在光纤线圈中的实际传输过程,对热传递动态过程中的时间元素进行进一步分解,细化为每一匝传输的渡越时间,用插值法使温度场的热传递按匝进行,得到了不同时间点处每匝光纤线圈的温度分布。设计了按匝传输分析计算非互易相移的新方法。对四极对称绕法和交叉对称绕法进行了仿真数值计算,结果表明与原算法相比,新算法的Shupe效应非互易相移计算精度提高了3个量级,符合预期。
In order to further improve the computational accuracy of non-reciprocal phase shift of the Shupe effect of the Interfering Fiber Optic Gyroscope (IFOG), based on the principle and process of heat transfer in the cylindrical coordinate system, a 1-turn optical fiber coil is taken as the basic unit and established on the MATLAB platform With the axial, radial and temporal changes in IFOG three-dimensional temperature distribution model. According to the principle of Shupe effect, based on the actual transmission process of light waves in the optical fiber coil, the time elements in the heat transfer dynamic process are further decomposed to refine the transit time of each turn, and interpolation Transfer by turn, obtained at different time points at each turn optical fiber coil temperature distribution. A new method of calculating non-reciprocal phase shift by turn transmission is designed. The simulation results of the quadrupole symmetric winding method and the cross-symmetric winding method show that compared with the original method, the Shupe effect non-reciprocal phase shift calculation accuracy of the new algorithm is improved by three orders of magnitude, in line with the expectation.