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利用两组布拉格光纤光栅 (FiberBraggGrating ,FBG)FBG1和FBG2对标准钢筋试件的应变和弹性模量进行了测量 ,并与电阻应变片的实验结果进行了对比。FBG1、FBG2和电阻应变片的应变测量灵敏度分别约为 1/ 14 5 .6、1/ 15 5 .8和 1/14 1.5 με/吨 ,理论值为 1/ 15 6 .86 με/吨 ;测量钢筋试件弹性模量分别为 2 .2 12× 10 5、2 .0 35× 10 5和 2 .2 73× 10 5Mpa,而理论值为 2 .0 3× 10 5Mpa。结果表明 ,作为测量应变的常用仪器 ,FBG比电阻应变片的实用性能更为优越。
The strain and elastic modulus of standard steel bars were measured by using two FBG FBGs FBG1 and FBG2. The results were compared with the experimental results of the strain gages. Strain measurement sensitivities of FBG1, FBG2 and strain gages were approximately 1/14 5 .6, 1/15 5 .8 and 1/14 1.5 με / t respectively, with a theoretical value of 1/15 6 .86 με / t; measurements The elastic modulus of the steel specimens were respectively 2.212 × 10 5, 2.05 × 10 5 and 2.2 × 10 5 Mpa, while the theoretical value was 2.03 × 10 5 Mpa. The results show that, as a commonly used instrument for measuring strain, FBG is more practical than strain gauge.