再入式无源环形谐振腔光纤角速度传感器

Reentrant passive ring resonator fiber optic rotation sensor

为研制高灵敏度且环长度更短的光纤角速度传感器 (FORS) ,对采用低相干长度光源、无源环形谐振腔以及高性能反射镜的新型再入式光纤角速度传感器 (RPR- FORS)进行了理论分析与实验研究。分析了无源环形谐振腔中定向耦合器的透过率、环形谐振腔的透过率与测量灵敏度的关系。通过采用机械方式改变反射系数的方法验证了反射镜在RPR- FORS中的作用 ;进行了相位调制器插入环形谐振腔内与插入环形谐振腔和反射镜之间的对比实验 ,证明了两种调制方式具有相同的效果。同时在初步实验中获得了角速度敏感信号。这种 RPR-

Fiber optical rotation sensor (FORS) was developed with high sensitivity and a short sensing loop through theoretical and experimental studies of a novel reentrant FORS (RPR FORS) which uses a low coherence length light source, a passive ring resonator and a high performance reflector. The sensitivity of RPR FORS was as a function of the resonator coupler transmittance and the coupling ratio, the resonator transmittance and the reflector reflectivity. An experimental curve for the reflector reflectivity was obtained by mechanically changing the reflectivity, which illustrates the importance of the reflector in RPR FORS. Experimental results showed that the phase modulator could be inserted inside the resonator or between the resonator and the reflector. These results show that the two modulation methods have the same effect with RPR FORS. The angular rate sensing signals were then obtained in the preliminary experimets. This RPR FORS analysis established the theoretical and experimental basis for the integrated optical rotation sensor.