Sensing theory of fiber optic intrusion sensor based on multimode fiber intensity modulation
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摘要: 介绍了一种采用"单模光纤-多模光纤-单模光纤"结构的强度调制型扰动传感器,传感光纤为多模光纤.以提高传感灵敏度为目的,对强度调制的传感原理进行研究,并通过仿真及实验验证原理,得出使用相干光源、阶跃折射率多模光纤、对轴熔接单模光纤和多模光纤可以得到传感灵敏度很高的扰动传感器.所述方案结构简单、传感距离长,可应用于各种扰动传感领域,如边界线、军事基地、石油管道等.Abstract: An intrusion sensor adopting a "single-mode multimode single-mode" (SMS)structure was introduced. The actual sensor element was the multimode fiber spliced to two single-mode fibers on its two ends. In order to improve the sensing sensitivity, the theory of intensity modulation was researched. High sensitive sensor structure was obtained by simulation and experiment. The sensor uses coherent light source, step-index multimode fiber, and splices the single-mode fibers and the multimode fiber along the fiber axis. This scheme can be deployed to various intrusion sensing applications such as country borders, military bases, oil pipelines, for its simple structure and long sensing distance.
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Key words:
- fiber optic sensors /
- optical fiber intrusion alarm /
- multimode fiber
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