分布式光纤监测技术已经逐渐应用于各个领域, 但是针对传感光缆在经受循环应力之后其传感性能的变化情况, 目前尚未开展深入的研究。针对在室内试验及各类监测工程中, 模拟荷载、温度以及环境条件的变化而使光缆经受反复循环应力的情况, 设计了3个试验, 对分布式传感光缆的循环疲劳性能进行了标定, 得到了不同工况下光缆的应变衰减曲线。试验结果表明, 光缆初始应变越大, 循环频率越高, 光缆应变的衰减量和衰减速率越大。

The distributed optical fiber monitoring technology has been gradually applied in various fields, but at the present, the performance variations of sensing cables when subject to cyclic stress have not yet been investigated in depth. In line with the repeated cyclic stress that the cables undergo indoor tests and in various monitoring projects, simulated load, temperature and the environmental condition changes, three tests are designed and the cyclic fatigue performances of the distributed sensing cables are calibrated, obtaining the stress attenuation curves of the cables in different conditions. The experimental results indicate that the higher the initial stress of the cables, the higher cyclic frequency and the greater the attenuation amount and rate of the cable stress.