摘要
为了确定弯曲力矩对EFPI光纤传感器输出的影响,制作了将光纤传感器埋入其中间层的复合板试件,并对试件进行三点弯曲试验,得到了弯曲力矩与光纤传感器输出应变之间的关系。随后,用显微镜对复合板的横截面进行观察,确定光纤传感器的埋入位置。对光纤传感器的埋入位置偏离复合板中间层的试件,运用有限元应变分析法(FEM)计算其应变值。实验结果表明,当光纤传感器的埋入位置偏离复合板中间层时,光纤传感器的应变大于计算值,说明弯曲力矩影响光纤传感器的测试性能。
Glass fibre reinforced plastics(GFRP)laminates containing the extrinsic fabryperot interferometer (EFPI)sensor in its middle plane were made for experiments. Threepoint bending tests of the laminate were performed to obtain the relation ship between the bending moment and the strain output from the sensor. Microscopic examination of the cross section containing the sensor was carried out. Finite element method(FEM) strain analysis was also performed to obtain the strain of the sensor embedded at the offcentre position obtained from the microscopic observation. From these results, it is found that the strain output from the EFPI sensor is larger than that calculated for the offcentre sensor. This discrepancy shows that the bending moment has affected the measuring ability of the sensor.
