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通过实验的方法研究了用于光纤传感器的光纤的蠕变特性.设计了一个弱相干的白光干涉测量系统,用该系统测量了光纤在静力拉伸和交变拉伸载荷作用下的蠕变.研究结果表明,对采用聚酯涂敷的光纤,在静载和动载荷的作用下,开始时均具有较大的蠕变,但是随着静载作用时间的推移或交变载荷的循环次数的增加,蠕变将停止.为了保证压力光纤传感器中光纤的预应力,建议光纤在装入传感装置以前预先加载一段时间或进行一定次数的拉-松循环加载消除光纤工作时可能产生的蠕变。
The creep characteristics of optical fiber used in optical fiber sensor are studied experimentally.The weak coherence white light interferometry system is designed and the creep of optical fiber under static tension and alternating tensile load is measured The results show that for the polyester coated optical fiber, the static and dynamic loads have larger creep at the beginning, but with the time of static load or the cyclic load of alternating load Creep will stop.In order to ensure the prestressing of the optical fiber in the pressure optical fiber sensor, it is suggested that the optical fiber be pre-loaded for a period of time before being loaded into the sensing device or be subjected to a certain number of pull-loose cycle loading to eliminate the possible creep of the optical fiber during operation change.