埋入混凝土的光纤传感器包层力学特性研究

Mechanical Behavior of Coatings for Optical Fiber Sensors Embedded in Concrete

本文用解析解探索光纤传感器埋入混凝土中其包层的特性及重要性。针对外荷载平行与光纤方向施加于混凝土构件时，其包层的材料特性和厚度变化而引起其内部应力分布特性作了一些研究。从解的分析可以看出，在埋入光纤的附近横截面应力集中很大程度上取决于包层的厚度及材料性质。对于给定的混凝土材料存在包层材料和厚度相结合的优化问题，选择某一优化目标，可能减小或消除其应力集中，而这对于光纤传感器在整个运行期间是至关重要。

The mechanical behavior of coatings for optical fiber sensors embedded inconcrete iS studied with analytical methods. When external load iS applied in parallel with theoptical fiber,it is shown that strain concentrations near an embedded optical fiber are highlydependent on the thiCkness and material propertics of the coatins. It is alSo Shown that, for agiven concrete,there exsists an optimum combination of material and thickness Of the coating.Under such combination,the Stress concentrations in the optical fiber,in its coating and in theconcrete neighboring to the embedded fiber can be eliminated. ThiS is Of utmostt imPOrtant for theoperation of OPtical fiber sensors.