摘要
本文提出一种利用飞秒激光逐线法制备并联集成光纤光栅阵列的技术,该光纤光栅阵列中的每个光纤光栅被制备在多模光纤纤芯轴向的相同位置但是径向的不同方位.利用该光纤光栅阵列实现了温度不敏感的矢量弯曲传感器,该传感器不仅可以实现弯曲曲率的测量,而且可以实现任意弯曲方向的判定.通过引入等效光纤光栅的解调方法,即对光纤光栅的反射波长变化做差分运算克服了该传感器弯曲和温度之间的交叉敏感问题,同时将传感器的弯曲灵敏度提高了几乎一倍,从而极大地提高了弯曲传感器的分辨率.因此,该矢量弯曲传感器可实现智能工程结构的弯曲曲率和弯曲方向的实时监测.
Parallel-integrated fiber Bragg grating(PI-FBG) arrays use a femtosecond laser line-by-line method. Each FBG in the fiber grating array is fabricated at the same position along the axial direction of a multimode fiber core but at different radial directions. The PIFBG array can be used to realize a temperature-insensitive vector bending sensor. Such a sensor can not only measure bending curvature but also determine any bending direction. By introducing the demodulation method of equivalent fiber grating, that is, the difference operation of the FBG reflection wavelength changes, the cross-sensitivity problem between the bending and the temperature is overcome, and the bending sensitivity of the sensor is almost doubled;thus, the resolution of the bending sensor is remarkably improved. Therefore, the vector bending sensor can achieve the real-time monitoring of the bending curvature and bending direction of an intelligent engineering structure.
作者
邵来鹏
包维佳
刘申
杜斌
杨凯明
付彩玲
刘雪雅
李正勇
王义平
SHAO LaiPeng;BAO WeiJia;LIU Shen;DU Bin;YANG KaiMing;FU CaiLing;LIU XueYa;LI ZhengYong;WANG YiPing(Key Laboratory of Optoelectronic Devices and Systems of Ministry1 of Education/Guangdong Province,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China;Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things,Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors,Shenzhen University,Shenzhen 518060,China)
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2021年第2期241-248,共8页
Scientia Sinica(Technologica)
基金
国家自然科学基金(批准号:61635007)
广东省自然科学基金(编号:2019A050510047,2019B151520042,2018A030310581)
深圳市科技创新委员会(编号:JCYJ20170818143853289,JCYJ20180305125352956)
深圳市基础研究计划自由探索项目(编号:JCYJ20170818143853289)资助。
关键词
光纤传感器
光纤光栅
弯曲传感器
矢量传感器
飞秒激光
optics fiber sensors
fiber Bragg gratings
bending sensors
vector sensors
femtosecond lasers
