绞合式光纤形变传感器的研究及其应用

Research and Application of Twisted Optical Fiber Strain Sensor

研究了绞合式光纤形变传感器的结构特征、传感特性和工作机理,并和其他种类的传感器做了比较,证明了该类型传感器的优越性。运用光纤的微弯损耗理论计算了该传感器的拉伸长度与光功率损耗的关系,通过检测出射光功率可以推断待测物的物理量变化。利用其特点,文中设计了一种能对微小形变进行实时监测的传感器,通过实验观察了传感器的输出量随着微小形变出现了有规律的变化。实验证明该传感器成功地监测了微小形变的变化规律并且不受其他设备的干扰和影响。

The structural features, sensor characteristics and working mechanism of a twisted optical fiber strain sensor were studied.By comparing with other types of sensors, superiority of this type of sensor was proved.The correlation between the stretched length and the optical power loss was calculated using the microbending loss in optical fiber.The change of physical properties was inferred by detecting the emitted light power.Considering all these features, we designed a real-time sensor which can monitor the slight deformation.The regular change of the sensor output was observed in the experiment of a slight deformation of the sensor.It proves that the sensor successfully monitors the slight variation and without the interference and influence of other devices.