光时域反射型传感器网络的设计

Design of Optical Time Domain Reflective Sensor Network

提出了一种基于光时域反射(OTDR)的反射式光路拓扑结构,该结构使用了一根光纤,多个气室通过光耦合器连接在光纤上,每个气室输入的光信号通过分光器分配,基于该结构可以实现光谱吸收型远距离多点气体浓度的检测。与传统时分复用(TDM)结构相比,实现了单根光纤测量多点气体的系统,减少了光纤和耦合器的衰减损耗。实验结果表明,该网络提高了远距离多点气体浓度检测的精度,同时增大了检测距离。针对该结构以及户外测量的要求,设计了开放反射吸收型气室,相比于现有光纤气体传感器所采用的气室,结构更加小巧紧凑,更适合于传感信息耦合入单根光纤网络进行传输。

In this paper,a reflective optical path topology is designed based on optical time domain reflection（ OTDR）.An open type gas chamber for outdoor environment is designed for the new optical topology. Optical signal is connected to an optical fiber through an optical coupler,and input optical signal of each air chamber is distributed through an optical splitter. Based on this structure,the spectrum absorption type long-distance multi-point gas concentration can be detected. Compared with the traditional time division multiplexing（ TDM） the new design reduces the consumption of fiber and coupler.