针对现有的准分布式光纤传感测量技术复杂、精度不高且响应时间较慢等问题, 设计出一种实时性高且成本更低的准分布式光纤传感器。传感器主要由柔性LED灯带和带有侧向耦合结构的聚合物光纤组成。侧向耦合结构被LED逐一照亮, 形成一系列传感单元。光通过侧向耦合结构入射聚合物光纤中, 当LED和耦合结构之间的介质改变时, 耦合光强增加, 光纤两端输出光强随之增加, 则可将液漏事件转化为耦合介质改变来测量。结果表明, 准分布式光纤液漏传感器具有检测和定位漏水信号的能力且定位精度小于等于10cm, 实现了液漏检测和漏点定位的功能。

In order to solve the problem that the existing quasi-distributed optical fiber sensing measurement technology is complex, the precision is not high and the response time is slow, a quasi-distributed optical fiber sensor structure with higher real-time performance and lower cost is designed. The sensor is mainly composed of a flexible LED strip and a polymer fiber with a side coupling structure. The side coupling structure is illuminated one by one by the LEDs to form a series of sensing probes. When the coupling medium changes from air to liquid, the lamp laterally couples the light into the polymer fiber through the side coupling structure, the coupling light intensity increases, and the pulse intensity detected by the optical power meters at both ends increases. The location of the leakage event can be obtained by the position of each pulse in its output sequence. At the same time, the effects of different side coupling structures on the coupled light intensity are studied. The results show that the quasi-distributed fiber optic sensor has the ability to detect and locate the water leakage signal, and the positioning accuracy is less than 10cm.