温度不敏感的少模光纤应变传感  

Temperature-Insensitive Strain Sensing Based on Few Mode Fiber

作　　者：张珊[1] 黄战华[1] 李桂芳[2] 王崇禧 赵健[1] 赵宁波[1] 蔡怀宇[1] 张尹馨[1] 

机构地区：[1]天津大学光电信息技术教育部重点实验室,天津300072 [2]中佛罗里达大学光学与光电学院,佛罗里达奥兰多328162700

出　　处：《中国激光》2017年第2期313-319,共7页Chinese Journal of Lasers

基　　金：天津市科学基金(14RCGFGX00844)

摘　　要：为了解决光纤传感器中普遍存在的温度和应变交叉敏感问题,基于少模光纤的模间干涉原理,研究了LP01和LP02模式干涉的应变和温度传感特性,详细分析了模间干涉传感的相位灵敏度理论。结合少模光纤的数值仿真结果,设计了一种温度不敏感的应变传感少模光纤,其纤芯直径为15.1μm,在1550nm下纤芯折射率为1.4512,包层折射率为1.444。搭建了实验系统来研究少模光纤温度和应变传感特性,结果表明:理论计算能够较好地预测实验结果;少模光纤在0~600μm范围内,应变的相位灵敏度为0.0196rad/μm,在30~330℃范围内,对温度不敏感,可有效改善温度和应变的交叉敏感问题。In order to solve the problem of cross sensitivity of temperature and strain that generally exits in fiber- optic sensor, the strain and temperature sensing characteristics of LP01 and LP02 mode interference based on the inter-modal interference principle of the few mode fiber are studied, and phase sensitivity theory of inter-modal interference sensing is analyzed in detail. A temperature-insensitive strain-sensing few mode fiber with core diameter of 15.1 μm, core refractive index of 1.4512 at 1550 nm and cladding refractive index of 1.444 is designed based on the numerical simulation results of the few mode fiber. The experimental system is built to research the strain and temperature sensing characteristics of few mode fiber. The results show that the theoretical calculation can predict the experimental result well. The phase sensitivity of the strain in the few mode fiber is 0. 0196 rad/μm in the range of 0-600 μm, which is insensitive to the temperature in the range of 30-330 ℃. It can effectively improve the problem of cross-sensitive of temperature and strain.

关 键 词：传感器 少模光纤传感 温度不敏感的应变传感 模间干涉 相位灵敏度 

分 类 号：TN29[电子电信—物理电子学]