光纤传感环圈是光纤陀螺的核心敏感部件，其内部应力分布对陀螺整体性能有不可忽视
的影响。对应力分析仪的测量原理——受激布里渊散射（SBS）进行了分析，并介绍了STA202 型应力分析仪的主要性能指标。使用该应力分析仪对多个不同的光纤陀螺传感环圈进行了测试，观察到了环圈内部存在的多种应力分布状况，并对其产生原因进行了初步分析。(Fiber optic sensing ring is the core sensitive component of fiber optic gyroscope, and its internal stress distribution has an important influence on the whole performance of the gyroscope. The measurement principle of stress analyzer -- stimulated Brillouin scattering (SBS) is analyzed, and the main performance indexes of STA202 type stress analyzer are introduced. A variety of fiber optic gyroscope sensing rings were tested by using this stress analyzer, and a variety of stress distributions in the ring ring were observed, and the causes of the stress distribution were analyzed.)