激光焊接封装的光纤光栅智能悬臂梁  

Smart cantilever beam of fiber Bragg grating packaged by laser welding

作　　者：王裕波 李玉龙[1] 吕明阳[1] 

机构地区：[1]南昌大学机电工程学院机器人及焊接自动化重点实验室,江西南昌330031

出　　处：《激光与红外》2016年第5期587-592,共6页Laser & Infrared

基　　金：国家自然科学基金项目(No.51265035);江西省自然科学基金项目(No.20151BAB206042)资助

摘　　要：针对光纤光栅在封装过程中容易遭受高温和热应力等破坏,采用激光焊接技术将镀镍金属化后的光纤光栅封装在316不锈钢表面。为了解决光纤光栅温度与应变的交叉敏感问题,基于参考光栅法的温度补偿原理制成了一种智能悬臂梁,实现了对温度和应变的同时测量。试验表明：光纤光栅两侧与不锈钢结合良好,激光焊接过程中光纤表面镀层未被损坏;焊接封装的光栅在23-47℃温度范围内进行了温度传感分析,温度灵敏度为22.15 pm/℃,较裸光栅提高了1.34倍。在恒定室温环境下和变温环境下,对焊接封装的光栅进行了应变传感试验,光纤光栅中心波长与应变成均线性变化关系,应变灵敏度分别为-2.24 pm/g和-2.27 pm/g。该智能悬臂梁有较高的测量精度,可用于工业生产中对温度和应变的实时监测。As fiber Bragg grating（ FBG） could be damaged by thermal loads or thermal stress when embedded in metals,FBG coated with nickel was packaged on surface of a 316 stainless steel substrate by laser welding.In order to solve the thermal-stain cross effects of the FBG,a smart cantilever beam was fabricated based on temperature compensation principle.Results show that the metal coated FBG can be well bonded with the stainless steel substrate.Temperature sensing property of the packaged FBG was studied within the temperature range of 23 - 47℃.Temperature sensitivity of the packaged FBG is 22.15 pm / ℃,which is about 2.34 times as that of the bare FBG.Strain sensing property of the packaged FBG was studied under the constant ambient temperature conditions and variation temperature conditions.In both of the cases,the wavelength of the packaged FBG and strain show linear trends,and the strain sensitivities are-2.24 pm / g and-2.27 pm / g,respectively.The smart cantilever beam shows excellent accuracy in monitoring strain and temperature simultaneously,which could meet the requirements of engineering applications.

关 键 词：光纤布拉格光栅 激光焊 温度补偿 交叉敏感 悬臂梁 

分 类 号：TN253[电子电信—物理电子学]