【摘要】 为了抑制宽谱光源谐振式光纤陀螺（RFOG）的相对强度噪声（RIN），提高宽谱光源RFOG精度，对光纤谐振腔敏感单元结构进行分析和优化。首先，根据多圈干涉叠加理论建立了仿真模型，探究不同敏感单元结构下宽谱RFOG的传输特性。其次，基于RFOG光场理论模型，分析了耦合器位置对陀螺的精度以及RIN大小的影响，实验验证了光纤环位于耦合器交叉端的非对称谐振腔具有更好的极限精度，并且能够抑制相对强度噪声。通过优化敏感单元结构，在使用直径10 cm，长度220 m的光纤环情况下，实现了0.0013 (°)/■的角度随机游走以及0.002 (°)/h的零偏不稳定性；并且使用直径5 cm，长度300 m的光纤环搭建了单轴陀螺样机，样机体积为170 cm~3，最终实现了0.01 (°)/■的随机游走以及0.02 (°)/h的零偏不稳定性。更多还原

【Abstract】 In order to suppress the relative intensity noise(RIN) of broadband light source-based resonant fiber optic gyroscope(RFOG) and improve the accuracy of RFOG. The structure of the fiber optic resonant cavity sensitive element is analyzed and optimized. First, a simulation model is established based on the multi-loop interference superposition theory to explore the transmission characteristics of the broadband RFOG under different sensitive element structures. Next, based on the RFOG optical field theoretical model, the impact of coupler position on the accuracy of the gyroscope and the magnitude of the RIN is analyzed. Experimental results show that the asymmetric resonator with the fiber loop at the coupler’s cross port achieves superior accuracy. And this structure suppresses relative intensity noise. By optimizing the sensitive element structure and using a fiber resonator with a diameter of 10 cm and a length of 220 meters, the angle random walk reached 0.0013(°)/■ and the bias instability reached 0.002(°)/h. In addition, a single-axis gyroscope prototype is built using a fiber loop with a diameter of 5 cm and a length of 300 meters. The prototype has a volume of 170 cm~3. the angle random walk reached 0.01(°)/■ and the bias instability reached 0.02(°)/h.更多还原