裂缝光纤传感的工程应用

光纤传感的灵敏性及工程"存活率"是其工程实用化的两个关键技术参量,对光纤-混凝土结构两种常用裂缝光纤传感光信号对裂缝宽度的灵敏性与存活率进行了实验研究,对光纤涂覆层对灵敏性影响的大小和机理进行了分析,并制作了灵敏性与存活率均较高的光纤试验样本,与裂缝成45°夹角时,相比于等直径的普通二次涂覆粗光纤(10/125/900μm),样本的灵敏性提高近65%,而存活率亦高出约15%。研究结果可为裂缝光纤传感的优化设计和工程应用提供了基本参照。

The sensitivity and livability of two kinds of crack sensing optic fibers for fiber optic-concrete structure were investigated experimentally.The effect of optic fibers coatings on the sensitivity was analyzed,and the experimental sensing optic fiber samples with greater sensitivity and livability were made.Compared with the common thick optic fiber(10/125/900 μm) of the same outside diameter,the samples sensitivity at the angle of 45° to crack is raised approximately by 65%,while its livability is higher...