摘要
在布拉格光栅(FBG)光纤的包层中制作微槽,结合敏感材料提高了FBG光纤传感器的灵敏度,拓宽了其传感应用领域。利用飞秒(fs)激光对Ⅰ型布拉格光栅光纤进行刻蚀,通过调节激光功率和辐照时间,分析光纤折射率变化以及光纤表面和内部结构的刻蚀特性,并探讨fs激光对光纤光栅微沟槽形貌和反射光谱的影响。实验结果表明,微槽表面由于碎屑的凝固而产生许多柱状结构,且随着激光能量的增加,柱状结构不断长大,槽深和形状服从高斯能量分布;随着激光功率和辐照时间的增加,反射率谱永久红移,带宽增加。利用微结构光纤增敏性能,有效提高微结构光纤光栅磁场探头和氢气探头的传感性能。
Micro-trench was fabricated into the cladding of fiber Bragg grating (FBG),and FBG sensors sensitivity was improved,with its sensing application field broadened.Type Ⅰ fiber Bragg grating structure damage was induced by focused femtosecond (fs) laser to form inscribed micro-structured fiber.Fiber surface and internal structure damages due to refractive index change by modulating the laser power and irradiation time were also investigated,with the effect of fs laser on the morphology of micro-trench and reflectivity spectrum of FBG discussed as well.The morphological results showed that,the surface of micro-trench had many pimples due to solidification of debris,and the pimples were growing with increasing laser energy.The depth of the groove and shape obeyed Gaussian energy distribution.Meanwhile the reflectivity spectrum was red shifted permanently and the bandwidth increased with growing laser power and irradiation time.Using the sensitization performance of micro-structured optical fiber,the sensing properties of the micro-structured fiber grating magnetic field probe and the hydrogen gas probe can be improved effectively.
作者
周贤
刘克非
张欣
张海波
明兴祖
ZHOU Xian;LIU Kefei;ZHANG Xin;ZHANG Haibo;MING Xingzu(Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle,Hubei University of Arts and Science,Xiangyang Hubei 441053,China;School of Mechanic Engineering,Hubei University of Arts and Science,Xiangyang Hubei 441053,China;College of Mechanical Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China)
出处
《包装学报》
2021年第6期34-41,共8页
Packaging Journal
基金
国家自然科学基金资助项目(51975192,61475121)
湖南省自然科学基金资助项目(2021JJ30214,2021JJ50042)
“机电汽车”湖北省优势特色学科群开放基金资助项目(XKQ2021050,XKQ2021044,XKQ2021043)
湖北文理学院科研启动基金资助项目(2059016)。
关键词
飞秒激光
布拉格光栅光纤
折射率
微结构
femtosecond laser
fiber Bragg grating
refractive index
microstructure
