基于白光干涉原理的光纤传感技术—Ⅳ.埋入式光纤传感器基础实验

White light interfereometric fiber optic sensing technology—Ⅳ: Fundamental experiments of embedded fiber optic sensor

发展了可埋入混凝土基复合材料内部的白光光纤引伸计,用于测量混凝土内部的应变或裂纹尖端张开位移,并对这些混凝土试件进行了实验研究。实验结果表明,光纤传感器不仅可以测量1D应变,也可以在2D方向上测量应变。对埋入土体内部的三包层光纤土力学传感器进行了标定实验,实验结果表明,传感器能够较好的反映土体形变,设计并制作了土体坝段和高边坡的模型,将经过标定的光纤土力学传感器埋设于模型内部,利用光纤白光干涉测量技术,对外部载荷作用下不同结构的土体模型进行了实验研究,对其变形量进行了测量。

White light fiber-optic extensometers can be embedded within cementitious composites have been developed for the measurement of strain or crack-tip opening displacements inside in the concrete structure. Experiments were conducted with the concrete specimens. The results show that the fiber sensor can be used not only for one-dimensional strain monitoring, but also for two-dimensional strain measurement. In order to measure the soil mechanics characteristic, a fiber optic sensor with three layers package has been designed and demonstrated, the calibration experimental results shown that the sensor can be used for soil deformation measuring. By using the soil darn and high side-slid model, the fundamental sensor response experiments under different loading are conducted. It is confirmed that the three layer packaged fiber optic white light interferometric sensor can be used for the deformation measuring of the soil based matrix materials.