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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-point optical fiber sensing system is designed for a wide range of object measurement. The structure is that a local control node connects all the remote sensing nodes in series through bidirectional optical fiber links. The local control nodes share the optoelectronic devices such as the light source and the photodetector, and realize the data processing circuit with the virtual instrument. The remote sensor node only includes the optical path formed by the sensitive components and the passive optical components, and can directly realize the time division multiplexing. Taking the 3-node methane gas detection as an example, the experiment and calculation show that the scheme can work effectively and the relative error of the first sensor node can be reduced below 0.2% through the cyclic detection.