对采用光纤布拉格光栅(FBG)传感器网络监测某飞机机翼盒段外加载荷位置信息进行了研究。研究了FBG传感器网络中传感器失效对外加载荷位置识别精度的影响程度；针对传统FBG传感器网络拓扑结构可靠性低的缺点，引入光开关，设计了一种具有更高可靠性的传感器网络拓扑结构，并对这两种网络结构的可靠性进行了研究。结果表明，新传感器网络的可靠性明显高于传统传感器网络的可靠性。单个传感器的失效概率不同，两种传感器网络可靠性差别也不同；当单个元器件的失效概率在0.001~0.01之间变动时，若系统允许外加载荷位置识别误差在5 mm内，则新传感器网络的失效率降为传统网络失效率的50%；若系统允许外加载荷位置识别误差在10 mm内，则新传感器网络的失效率至少降低为传统网络失效率的12.5%。

The fiber Bragg grating (FBG) sensor network which is used to monitor the external load position information of a certain aircraft wing box is researched in this paper. The forecast precision influence of the disabled sensor number to the external load position information is researched; Optical switch is introduced to overcome the shortcoming of the traditional FBG sensor network topology low reliability, proposing a higher reliabile network topology, and the reliability of the two types FBG network topologys are researched. The results indicate that the reliability of the new sensor network is superior to the traditional one obviously. The reliability of the two types network topologys is dependent on the failure rate of the single sensor. When the single component failure rate change between 0.001 and 0.01, if the acceptable position forecast error of the external load is less than 5 mm, the failure rate of the new sensor network is reduced to 50% of the traditional one; if the acceptable position forecast error of the external load is less than 10 mm, the failure rate of the new sensor network is reduced to 12.5% of the traditional one at least.