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光纤克尔效应是影响谐振式光纤陀螺(RFOG)性能提升的重要因素之一。以光纤克尔效应为基础,结合Sagnac效应,建立RFOG克尔效应零偏误差的理论模型,分析谐振腔内顺、逆时针光路中输出耦合器的耦合比之差以及谐振腔两臂长度差对陀螺零偏误差的影响,提出结合RFOG结构设计的光强控制方案,并通过4轮实验验证该方案的有效性。结果表明,该方案能有效抑制克尔效应,零偏误差从0.150(°)/s降低至0.017(°)/s,light path零偏稳定性从1300(°)/h提升至140(°)/h,陀螺样机性能提升近1个数量级。
Fiber Kerr effect is one of the important factors that affect the performance of resonant fiber optic gyroscope (RFOG). Based on Kerr effect of optical fiber and Sagnac effect, a theoretical model of zero offset error of Kerr effect of RFOG is established. The difference of coupling ratio of output coupler in CW and CW optical path and difference of length of arms in both arms of resonator are analyzed Gyro zero bias errors, the combination of RFOG structure design light intensity control scheme, and through the four rounds of experiments to verify the effectiveness of the program. The results show that this scheme can effectively reduce the Kerr effect, reduce the zero bias error from 0.150 (°) / s to 0.017 (°) / s, and increase the bias stability of light path from 1300 (°) / h to 140 (°) / h, gyro performance increased by nearly 1 order of magnitude.