混凝土结构内部应变光纤检测试验研究

Experimental research on strain measurement in concrete specimens by fiber optical sensors

简要介绍了一种基于光纤白光Michelson干涉仪原理的光纤应变传感器和测量混凝土内部应变的原理 ,并采用Michelson光纤白光应变测量干涉系统 ,利用新型光纤传感探头 ,对混凝土内部的一维应变状态进行了测量 ,给出了混凝土试件单轴力学实验结果并与Instron85 0 6液压伺服材料实验机得到的结果进行了比较和分析 .试验显示当荷载在极限荷载的 80 %以前为线性阶段 ,线性范围内光纤传感器与Instron85 0 6测量结果大体符合 ,说明线性区间应力应变内部状态与外部是一致的 .试验结果表明 ,这种新型光纤传感器显示了良好的传感性能 ,能够监测混凝土内部应变状态 ,发挥出成活率高、绝对值测量和寿命长等优势 .

A fiber-optic sensor based on white light Michelson interferometer and the principle of detecting strain in concrete is introduced. One dimensional internal strains in concrete specimens were measured based on embedded novel optical fiber sensors with a white light interferometric Michelson system. The results obtained are analyzed and compared with the experimental data given by Instron8506 material testing machine. The experiment shows that when load is less than 80 percent of utmost load the relation between stress and strain keeps linear, and the results obtained through optical fiber sensor and Instron8506 are generally accordant. It indicates that the interior status of stress and strain is coherent with exterior in linear area. Experiment results show that the novel sensor has advantages in surviving capability, absolute value measurement and service life.