光纤类光栅聚合物波导应变传感探究  

Investigation of fiber optic grating polymer waveguide strain sensors

作　　者：谭心[1,2] 张硕 杨桥 李自鹏 贺占清 王健 TAN Xin;ZHANG Shuo;YANG Qiao;LI Zipeng;HE Zhanqing;WANG Jian(School of Mechanical Engineering,Inner Mongolia University of Science&Technology,Baotou 014010,China;Inner Mongolia Key Laboratory of Intelligent Diagnosis and Control of Mechatronic System,Baotou 014010,China)

机构地区：[1]内蒙古科技大学机械工程学院,包头014010 [2]内蒙古机电系统智能诊断与控制重点实验室,包头014010

出　　处：《激光杂志》2024年第10期1-10,共10页Laser Journal

基　　金：国家自然科学基金项目(No.62365015);内蒙古自治区自然科学基金项目(No.2023MS05047)。

摘　　要：利用光敏材料的光固化特性,在两根多模光纤之间通过逐级固化构建了类光栅聚合物长波导结构。采用了Norland光胶粘剂(NOA)作为光聚合体系。首先,在两根排列的光纤之间涂抹了该光胶粘剂,然后使用405 nm激光灯对液滴进行固化,从而在排列的光纤芯之间形成了聚合物通道,在外力作用下使其中一端脱离,重复操作即可得到类光栅结构,在形成的类光栅结构后再次固化一段长波导即完成了类光栅聚合物长波导。对这些波导进行了力学响应的研究。通过改变光栅的尺寸,寻找到了最佳的光栅聚合物长波导。研究结果表明,类光栅聚合物长波导的引入使光传输随着波导间距呈极高线性变化趋势。具体而言,当类光栅聚合物长波导光栅尺寸为5μm,线性度可达到0.99以上,拉应变敏感度为49/με。Utilizing the photo-curing characteristics of photosensitive materials,a fiber-optic-like grating polymer long-waveguide structure was constructed between two multimode optical fibers through stepwise curing.This paper employed Norland Optical Adhesive(NOA)as the photopolymerization system.Initially,the optical adhesive was applied between two aligned fibers,followed by curing with a 405 nm laser to solidify the droplets,thus forming a polymer channel between the aligned fiber cores.By applying an external force to detach one end and repeating the operation,a grating-like structure was obtained.After forming the grating-like structure,a long waveguide was further cured to complete the grating-like polymer long-waveguide.The mechanical response of these waveguides was studied.By varying the dimensions of the gratings,the optimal grating polymer long-waveguide was identified.The results indicate that the introduction of the grating-like polymer long-waveguide leads to an extremely linear trend in optical transmission with waveguide spacing.Specifically,when the grating size of the grating-like polymer long-waveguide is 5μm,the linearity can reach above 0.99,with a strain sensitivity of 49/με.

关 键 词：聚合物 光敏材料 应变传感 力学特性 光栅 

分 类 号：O439[机械工程—光学工程]