基于S锥结构光纤传感器的研究  

Research on Optical Fiber Sensor Based on S-taper Structure

作　　者：杨帆[1] 曹晔[1] 李美琪 鞠慧 YANG Fan;CAO Ye;LI Meiqi;JU Hui(The College of Electronic and Information,Qingdao University,Qingdao 266071,China)

机构地区：[1]青岛大学电子信息学院,山东青岛266071

出　　处：《青岛大学学报（工程技术版）》2022年第2期1-6,共6页Journal of Qingdao University(Engineering & Technology Edition)

基　　金：国家自然科学基金资助项目(11444001);天津市自然科学基金资助项目(14JYBJC16500)。

摘　　要：针对传统基于S锥结构的光纤传感器存在制作工艺复杂、灵敏度低和温度交叉敏感等问题,本文设计并验证了一种同时测量折射率(refractive index,RI)和温度的新型光纤传感器。传感结构由细芯光纤(thin-core fiber,TCF)上制作的S锥结构和单模光纤(single-mode fiber,SMF)上制作的球形结构组成,并对光谱特性进行理论和实验研究。实验结果表明,在1.3384~1.3527的折射率范围内,折射率灵敏度最大可达到-201.19074 nm/RIU,折射率灵敏度是现有的基于单模S锥结构光纤传感器的4倍。在30℃~70℃变化范围中,温度灵敏度最大可达到0.0717 nm/℃。通过将灵敏度系数代入灵敏度矩阵中,可实现折射率和温度的双参量测量,温度交叉敏感问题得以解决,具有制作成本低、结构简单、实验稳定性好等特点。该研究应用前景广阔。In view of the problems of traditional optical fiber sensor based on S-taper structure,such as complex manufacturing process,low sensitivity and temperature cross sensitivity,a new optical fiber sensor for simultaneously measuring refractive index(RI)and temperature is proposed and verified in this paper.The sensor head is composed of thin core fiber S-taper structure and spherical structure.The spectral characteristics of RI and temperature are investigated theoretically and experimentally.Experimental results show that the maximum refractive index sensitivity is-201.19074 nm/RIU in the RI range of 1.3384~1.3527,which is four times higher than that of the existing optical fiber sensor based on single-mode S-taper structure.And the temperature sensitivity is 0.0717 nm/℃in the temperature range of 30~70℃.By substituting the sensitivity coefficient into the sensitivity matrix,the two parameters measurement of refractive index and temperature can be realized,and the problem of temperature cross sensitivity can also be solved.The sensor has the advantages of low cost,simple structure and high sensitivity.

关 键 词：S锥 细芯光纤 球形结构 折射率 温度 

分 类 号：TN253[电子电信—物理电子学] TP212.14[自动化与计算机技术—检测技术与自动化装置]