摘要
为了实现高精度的应变传感测量,提出了一种基于高灵敏度微纳光纤耦合应变传感器。将两根单模光纤剥掉涂覆层后放置于光纤拉锥平台上,并将这两根光纤相互缠绕在一起,设置所需拉锥参数,打开氢气流量,利用氢气火焰对两根光纤进行拉锥燃烧,制备光纤耦合器,利用耦合后的强倏逝场特性实现对应变的测量。通过对该器件的反复测量,得出它具有很好的可逆性。为克服交叉敏感问题,通过干涉波谷对温度与应变具有不同敏感特性,利用系数矩阵解决温度对应变的影响。实验结果显示,应变灵敏度为20.35 pm/με,相应的线性相关系数为99.9%。该应变传感器相较于其他传感器灵敏度高、稳定性好、成本低,在建筑安全检测等方面具有一定的应用价值。
To realize high-precision strain sensing measurements,a strain sensor based on high-sensitivity micro-nano fiber coupling was proposed.Two single-mode optical fibers were stripped off from a coating layer and placed on an optical fiber pull-cone platform,and the two optical fibers were wound together.Then,the required pull cone parameters were set,and hydrogen flow was turned on.Then,the two optical fibers were pull-cone burned using a hydrogen flame to prepare the optical fiber coupler.The strain measurement was realized by using the strong evanescent field characteristic after coupling.Based on repeated measurements,it was concluded that the sensor has good reversibility.To overcome the cross-sensitivity problem,the interference dip has different sensitive characteristics with respect to temperature and strain,and a coefficient matrix is used to determine the influence of temperature on strain.The experimental results show that the strain sensitivity is 20.35 pm/με and the corresponding linear correlation coefficient is 99.9%.In contrast with other sensors,this strain sensor has high sensitivity,good stability,and low cost;further,it has substantial application value in building safety detection and other tasks.
作者
彭保进
李连琴
马倩倩
王梦娇
王增辉
PENG Bao-jin;LI Lian-qin;MA Qian-qian;WANG Meng-jiao;WANG Zeng-hui(College of Physics and Electronic Information Engineering,Zhejiang Normal University,Jinhua 321004,China)
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2021年第5期958-966,共9页
Optics and Precision Engineering
基金
国家自然科学基金资助项目(No.11274278)
浙江省基础公益研究项目(No.LGF19F050001)
中国浙江省自然科学基金资助项目(No.LY17F050003)。
关键词
光纤传感
微纳光纤耦合器
应变传感器
耦合模理论
安全检测
optical fiber sensing
micro-nano fiber coupler
strain sensor
coupling mode theory
safety inspection
