Design And Optimization Of Non-reciprocal Structure Of Fiber Ring

Fiber optic gyroscope is a new type of instrument used to measure the angular rate of the carrier in the inertial navigation system.It has all the advantages of all solid state,simple structure,low production cost,high measurement accuracy and sensitivity.However,the fiber ring as the core sensor device in the fiber optic gyroscope is very sensitive to changes in the ambient temperature in practical applications,and a large zero-bias temperature drift will occur in the changing temperature field.The zero offset drift caused by the angular velocity of the carrier is indistinguishable in the output signal of the fiber optic gyroscope and causes measurement errors,which greatly hinders the practical application of the fiber optic gyroscope.This article focuses on the fiber optic wrap method in the fiber optic gyroscope temperature error hardware compensation method,and optimizes the design of the fiber optic wrap method by analyzing the causes and suppression methods of the temperature error,thereby improving the measurement accuracy and temperature performance of the fiber optic gyroscope.This article first introduces the measurement principles of interferometric fiber optic gyroscopes,non-reciprocity errors and suppression methods in fiber optic gyroscopes,the functions of various optoelectronic devices in fiber optic gyroscopes,and the main performance indicators of fiber optic gyroscopes.Then the formulas of shupe error and thermal stress error in the fiber ring are derived,the main factors affecting the temperature error of the fiber ring are analyzed,and the improvement of the fiber wrapping method can be used to suppress the temperature non-reciprocity error generated in the fiber ring.Then,the mathematical model of the temperature phase error of each winding fiber loop in layers is established,and thesuppression effect of each winding on the temperature gradient is theoretically analyzed.On the basis of the cross-symmetric winding method,the anti-cross-symmetric winding method is proposed,and it is found that the winding method has a good suppression effect on the radial temperature gradient and the axial temperature gradient,and can effectively reduce the temperature error in the fiber ring.Finally,the finite element model of the full-frame fiber ring was established in ANSYS,and the finite element analysis method was used to simulate the temperature error generated by the various winding fiber rings under different temperature field loads.The experimental results show that the same temperature field load The temperature error generated in the cross-symmetrically wound fiber loop is the smallest,and the ability to suppress the temperature gradient is the strongest.And for the anti-cross symmetry winding method,the winding process and skeleton structure were improved.