一种增敏型光纤光栅应变传感器的开发及应用

Development and application of FBG strain sensor with enhanced sensitivity in the model vibration experiment

提出了一种基于两端夹持封装技术的光纤光栅应变传感器。该传感器具有应变放大机制,测量精度超过了裸光纤光栅,而且通过改变封装工艺参数可以调节应变传递率。这种传感器既可以埋入结构中也可以通过辅助构件构成夹持式传感器。利用万能试验机对该传感器进行了应变性能标定实验,研究了不同基体材料上传感器的应变灵敏特性,并与理论分析结果作了对比。这种光纤光栅应变传感器在高层大厦模型地震试验中进行了检测。试验结果表明,基于两端夹持封装技术光纤光栅传感器具有良好的灵敏度、低噪、牢固可靠以及测量长期稳定性好的优点,是动载环境下工作的结构长期安全监测的理想器件。

A small dimension sensor with two holders in both sides of fiber Bragg grating which are protected and packaged by stainless steel tube,is developed for strain measurement. The functionality of this FBG strain sensor is discussed,and experiments are conducted on the universal material testing machine to calibrate its strain transferring characteristics. The tubepackaged strain FBG sensors are applied in the vibration experiment of mansion model. The strain measured by FBG sensor agrees well with the electric resistance strain sensor and the theoretical result. This FBG strain sensor has the advantages of small size,high precision and flexible use,which demonstrates promising potentials.