基于A.Kung等所提出的后向瑞利(Rayleigh)散射式光纤转动传感原理,提出了一种双环形腔复合的Rayleigh后向散射式光纤转动传感器(RBFORS)新结构.利用两个2×2单模光纤耦合器,建立了复合双环形腔Rayleigh后向散射式光纤转动传感器的理论模型.通过计算机仿真,给出了用光时域反射计(OTDR)探测到的光纤转动传感器输出信号的特性,利用优化的环长和分光比两结构参量,分析了模拟结果.选择双环的长度分别为1500 m和1078 m,2×2光纤耦合器的耦合系数分别为95.23%和94.88%构建了测试系统,对不同转速所探测到的Rayleigh后向散射信号进行测量,得到了实验结论与理论相一致的结果.双环的采用,提高了测量信号的强度,增加了测试的有效数据,使其更有利于识别,提高了转速测量的精度. Based on the principle of Rayleigh scattering optical fiber rotation sensing proposed by A. Kung et al., A new dual-annular cavity composite Rayleigh backscatter fiber optic rotation sensor (RBFORS) × 2 single-mode fiber coupler, a theoretical model of Rayleigh backscattering optical fiber rotation sensor with double double-annular cavity was established.By computer simulation, the output signal of optical fiber rotation sensor detected by optical time domain reflectometer (OTDR) , The simulation results are analyzed by using the optimized two parameters of the ring length and the splitting ratio.The lengths of the double rings are selected as 1500 m and 1078 m, respectively, and the coupling coefficients of the 2 × 2 fiber coupler are 95.23% and 94.88% respectively Test system to measure the Rayleigh backscattered signals detected at different rotational speeds, and the experimental results are consistent with the theoretical results. The use of double rings improves the strength of the measured signals and increases the effective data of the test to make it more Is conducive to recognition, improve the speed measurement accuracy.