埋入光纤进行复合材料中的应变测量

STRAIN MEASUREMENT INSIDE OF COMPOSITES BY EMBEDDED OPTICAL FIBER INTERFEROMETER

由于光纤传感器所具有的特点，把光纤埋入复合材料内部进行应变测量，从而监测复合材料的性能改变，是随着智能复合材料结构的研究而发展起来的一项新技术，本文用弱波导理论的有关结果研究了光纤在受到力作用时，光纤应变和其中传输光的位相改变之间的关系，计算了Ｃｏｒｎｉｎｇ光纤在轴向应力作用下的应变－位相灵敏度，为形成干涉型光纤传感器提供理论基础；同时给出了单向受力情况下的实验验证，分析了误差原因。

Because of the merits of optical fiber sensor comparing to other sensors, it is especially adapted to monitor the functions of composites and its varying with surroundings when embedded into composites during production, this technology has developed with the study of smart materials and structures. This paper analyzed the relationship between the varying of optical phase in the fiber and strain induced into by load or change of surroundings of composites using the results of weak wave guide theory; the special case of single mode Corning optical fiber has shown the sensitivity of optical phase changing to strain; meanwhile experimental results were provided to prove the theory, and errors were also analyzed.