The Circuit Development Of Super-large Ring Fiber Optic Gyroscope

As an angular velocity sensor in inertial technology,fiber optic gyroscope is widely used in the fields of aviation,navigation and defense industry.The super-large ring fiber optic gyroscope is based on the fiber-optic gyroscope to increase the size of the fiber-optic ring to enhance the Sagnac effect,improve the accuracy and sensitivity of the measurement,and make the super-large ring fiber optic gyroscope zero-bias stability reach 10^-3°/h,and it can be applied in the field of precision measurement such as geodesy,seismic monitoring,and Universal Time.However,the increase of the size of the fiber ring in the super-large ring fiber gyroscope will also bring more noise problems,which brings difficulties to the detection of the signal of the super-large ring fiber gyroscope,and becomes one of the factors restricting the development of the very large ring fiber gyroscope.The paper based on the project of“universal time precision measurement based on super-large ring fiber optic gyroscope”,and the circuit of the super-large ring fiber optic gyroscope is developed,and a circuit processing scheme with simple structure and good performance is designed to realize the effective detection of the Sagnac signal.Firstly,the working principle and signal detection method of the super-large ring fiber optic gyroscope are introduced,and the problems in the super-large ring fiber optic gyroscope are analyzed.Secondly,the super-large ring fiber optic gyroscope circuit hardware was built.In order to reduce the influence of temperature and vibration on the circuit,the temperature,humidity and inclination of the laboratory were measured and evaluated.The test results show that the temperature fluctuation is less than 0.30°C,the humidity fluctuation is 5%,and the inclination fluctuation is less than 0.30 arc seconds under the condition of temperature control,which Can meet our environmental needs for building circuits and related experiments.Finally,the virtual instrument PXI system and LabVIEW software are used as the platform to design the super-large ring fiber optic gyroscope circuit control program.Under normal temperature conditions,the designed circuit control program is used to the super-large ring fiber optic gyroscope which fiber ring diameter 38cm and the total fiber length 30 km.The test was carried out in a super-large ring fiber-optic gyroscope.The test results show that the zero-bias stability of the super-large ring fiber-optic gyroscope reaches 10^-5°/h.In the next comparative experiment of circuit algorithm was carried out in a fiber optic gyroscope with a diameter of 12cm and a total length of 1.5km.After optimizing the circuit algorithm,In the4°/s input angular velocity to private scale factor nonlinearity of fiber optic gyroscope to35.1ppm,fiber optic gyroscope zero bias stability reached 1.6 10^-3°/h,and measured the earth rotation angular velocity and the theoretical error of 1.7%.Compared with the circuit algorithm before optimization,the nonlinearity of the scale factor and the average error of the measured earth speed are increased by an order of magnitude,and the bias stability is improved by 4.1 times.