基于光纤智能夹层传感结构的应力测量研究

A Study on Stress Measurement Based with Optical Fiber Smart Layer Sensor Structure

制作了一种模块化的光纤传感夹层,对夹层内的光纤传感器的应力特性进行了实验研究。分析了应变对传感系数的影响,对埋入到光纤智能夹层中的两种光纤传感器的输出特性进行了比较。实验结果表明:光纤Bragg光栅传感器的波长漂移与应变之间具有理想的线性关系,但应变灵敏度由1.2pm/με降至1.15pm/με;由于制作工艺的局限,对于非本征F-P光纤传感器,当应变达到350με后,应变与载荷具有较好的线性响应。与非本征F-P光纤传感器相比,光纤Bragg光栅传感器是光纤智能夹层首选的应变传感器。将埋入了Bragg光栅传感器的智能夹层粘贴于某型飞机的翼-身连接构件内部进行监测,实验结果为光纤智能夹层应用于复合材料结构的应变监测提供了参考。

A modularize optical fiber interlayer was made, the properties of stress for optical fiber sensors which embedded in the interlayer were studied experimentally, the effect of strain on sensing coefficient was analyzed. The experimental results indicate that the relationship of wavelength change and strain for FBG is linear, but sensitivity of strain for FBG is reduced from 1.2pm/με to 1.15pm/ με. For the extrinsic Fabry-Perot interferometer sensor, the strain has good linear relationship with the load after the strain reachs to 350 because of the localization of facture craftwork. Experimental results can provide guidance for stress monitor of inner wing-body linked components.