提出了一种光纤光栅(FBG)的毛细钢管封装工艺,并通过材料试验和水浴法试验对其应变与温度传感特性进行了研究.与裸光纤光栅的测试结果比较表明,毛细钢管封装工艺基本不改变光纤光栅的应变传感特性,但是温度灵敏度系数提高了约2.5倍.经过该工艺封装的光纤光栅可以探测识别1 με与0.05℃的应变与温度变化.

In consideration of bare optical fiber being fragility, the steel capillary encapsulating technique for FBG sensor was developed in this study, and then the temperature and strain sensing properties of the encapsulated FBG sensor were experimentally studied on material test system and under hot water, respectively. The comparison of the experimental results between encapsulated fiber and bare fiber indicated that the strain sensing properties of the encapsulated FBG sensor are nearly the same as that of bare FBG, however, the temperature sensing ability of encapsulated FBG sensor is improved and the sensitivity coefficient is 2.5 times as much as that of bare FBG. The strain and temperature sensing precisions of the encapsulated FBG are 1 με and 0.05℃, respectively. The encapsulated FBG is proper for application in civil engineering.