可实现温度降敏的金属化光纤布拉格光栅

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

摘要:

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。

Abstract:

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.