可实现温度降敏的金属化光纤布拉格光栅

针对光纤布拉格光栅(FBG)传感器用于精确测量应力/应变场合时需屏蔽或补偿其温度灵敏性,本文在FBG化学镀Ni保护的基础上加入ZrO2微粒,形成Ni-ZrO2化学复合镀层,既具有金属镀层的保护作用,同时又实现了FBG的温度降敏。经元素分类扫描(EDS)测试,Zr元素的质量含量为30.12%,Ni元素的质量含量为67.87%;经扫描电镜(SEM)检测,复合镀层与FBG传感器结合紧密。对两支Ni-ZrO2化学复合镀保护的FBG传感器进行了多次30～90℃的温度传感实验,相比于化学镀Ni的FBG,其温度灵敏系数平均下降了34.59%。这表明,经Ni-ZrO2化学复合镀保护的FBG传感器具有温度降敏的特性。

A novel metallized fiber Bragg grating sensor with a lower temperature sensitivity

When fiber Bragg grating(FBG) sensors are used to measure stresses and strains,the influence of the ambient temperature on the FBG should be avoided or compensated.The temperature sensitivity of a FBG can be decreased by using an appropriate coating on the FBG.A novel Ni-ZrO2 composite coated FBG sensor with a lower temperature sensitivity is developed in this study.Elemental distribution scan(EDS) tests show that the contents of Zr and Ni are 30.12 wt.% and 67.87 wt.%,respectively.Scanning electron microscope(SEM) tests show that the Ni-ZrO2 composite coating covers the fiber well.Temperature sensing experiments were conducted by using two Ni-ZrO2 coated FBGs in the temperature range of 30~90 ℃.The results show that the average temperature sensitivity coefficient decreases by 34.59% compared with the Ni-coated FBG,which indicates that the FBG with Ni-ZrO2 composite coating has a lower temperature sensitivity.