白光干涉双环传感网络理论与实验研究

构造了一种基于双环形拓扑结构的白光干涉光纤传感网络．可用于智能结构中准分布应变或温度的测量。光纤传感网络基于空分多路复用技术(SDM)．目的是增强带载能力．降低单点传感器的测量成本，并借助丁双端口问询技术．增强传感网络的抗毁坏能力。分析了环形网络结构的低相干多路复用原理．根据空分复用的光程匹配条件．推导了传感器干涉信号的强度特性。实验中对连接9个传感器的双环传感网络特征及其抗损坏特性进行了验证．并对实验结果进行了分析和讨论。

Theoretical and Experimental Study on White-Light Interferometric Sensing Network with Double-Ring Topology

A white-light interferometric fiber optical sensing network based on the double-ring topology is demonstrated, which can be applied to the measurements of quasi-distributed strain and temperature in a smart structure. In order to increase the multiplexing capacity, decrease the measurement cost of each single point sensor, and improve the ability to resist destruction of the sensor network by resorting to the double-port inquiring technology, the double-ring fiber optical sensing network based on the space division multiplexing (SDM) is further developed. The low-coherent multiplexing principle in the double-ring network structure is analyzed. And based on the optical path matching condition of space division multiplexing, the intensity characteristic of the interference signal in the sensor is deduced. The characteristics of double-ring sensing network connecting 9 sensors and its property of resisting destruction are verified by experiments, and the results of experiments are analyzed and discussed.