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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.
An intensity modulation type disturbance sensor with “single mode fiber - multimode fiber - single mode fiber” structure is introduced, and the sensing fiber is multimode fiber.For the purpose of improving the sensitivity of the sensor, the intensity modulation sensing Principle, and through the simulation and experimental verification principle, it is concluded that the coherent light source and the step index multimode fiber can be used to get the sensitive sensors with high sensitivity to axis welding single mode fiber and multimode fiber. Simple structure, long sensing distance, can be applied to a variety of disturbance sensing areas, such as the border line, military bases, oil pipelines.