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利用光纤光栅作为传感元件,对螺纹钢标准拉伸试验试件的拉伸应变特性进行了分析与测量,采用电阻应变片作为对比测量,并与理论值进行了比较。测量结果FBG2的应变测量灵敏度为15.647 με/kN非常接近理论期望值15.680 με/kN,而电阻应变片的应变测量灵敏度仅为14.162 με/kN:同时,利用光纤光栅测量钢筋试件弹性模量,其中FBG2测得弹性模量为2.03×105MPa与标准测量值一致。结果表明,作为测量应变的常用仪器,光纤光栅比电阻应变片具有更强的实用性。
The tensile strain characteristics of the standard tensile test specimen of the rebar were analyzed and measured by using fiber grating as sensing element. The strain gage was taken as the contrast measurement and compared with the theoretical value. The FBG2 strain measurement sensitivity of 15.647 με / kN is very close to the theoretical expected value of 15.680 με / kN, while the resistance strain gauge strain measurement sensitivity of only 14.162 με / kN: At the same time, the fiber grating elastic modulus measurement of steel specimens, in which FBG2 measured elastic modulus of 2.03 × 105MPa consistent with the standard measurements. The results show that, as a commonly used instrument for measuring strain, FBG is more practical than strain gauges.