A model building method of single-axis interferometric FOG based on thermally induced nonreciprocal error

Thermal analysis for the single-axis fiber optic gyroscope is carried out, and the influence of the fiber-loop temperature field on gyro output is researched. In this paper, Fiber optic gyroscope model and fiber loop model are established and validated, then the temperature field of the gyroscope and fiber loop are simulated and analyzed. By comparing temperature nephograms of the fiber loop and the temperature of the fiber loop section central node, the temperature transmission rate inside the fiber loop is analyzed. Extract the boundaries' temperature of fiber loop and program based on the theory of thermally induced nonreciprocal error. After obtaining the nonreciprocal error caused by temperature, we can compensate the error by the algorithm through subtracting the error from the gyro output value. In this paper, an accuracy verifying method of finite-element simulation model is presented, and an example of finite element analysis for thermal field is given. The thermally induced nonreciprocal error analysis is given considering temperature gradient and thermal stress.