基于LabVIEW的多点串联光纤传感系统设计

Design of a Multi-Node Cascading Optical Fiber Sensing System Based on LabVIEW

设计了一种远程多点光纤传感系统用于大范围对象测量,其结构为一个本地控制节点通过双向光纤链路串联所有远端传感节点。在本地控制节点共享光源、光电检测器等光电器件,并结合虚拟仪器实现数据处理电路;而远端传感节点仅包含敏感元件、无源光器件构成的光路,并能直接实现时分复用。以3节点系统的甲烷气体检测为例进行实验和计算,结果证明该方案能够有效工作,通过循环检测可使首个传感节点的相对误差降至0.2%以下。

A remote multi-node optical fiber sensor system is designed to detect a long range object. The whole structure is a connection in series from a local control node to all the remote sensing nodes with bi-directional fiber links. At the local con- trol node, the optoelectronic devices are shared including the light source, photodetectors and so on, and the data processing circuit is realized with virtual instrument. So there is only optical path made up by the sensitive element and passive optical devices at each remote sensing node. Besides, as a result, time division multiplexing can be carried out directly. A three- node system for methane gas detection is constructed as an example of experiment and calculation. The result shows that the system can work efficiently, and the relative error of the first sensing node can be reduced to below 0.2%by cycle detection.