首页|Bend-tolerant fiber sensor based on BOTDR system
Bend-tolerant fiber sensor based on BOTDR system
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A simple and inexpensive sensing structure,single mode fiber(SMF)alignment fusion to 62.5 μm stepped in-dex-multimode fiber(SI-MMF),combined with Brillouin optical time domain reflectometry(BOTDR)system,is used as a distributed sensor in the field of structural safety and health monitoring(SSHM)of large infrastructures in terms of its prominent bending resistance.The bend loss principle and influencing factors of the fiber are analyzed,and the bending resistances of different fibers are discussed on the basis of theoretical and experimental comparisons.The bend-tolerant capacity and temperature sensing characteristics of the 5 km sensing structure are measured by using the self-developed frequency-shifted local heterodyne BOTDR system.The results show that the proposed sensing struc-ture has excellent bend-tolerant capacity with a minimum bend radius and temperature measurement error of 1.25 mm and 0.69℃,respectively,which indicates that the proposed sensing structure has huge potential in the field of SSHM of large infrastructures.
LI Yongqian、FAN Haijun、WANG Lei、ZHANG Lixin、LIU Ting
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Department of Electronic and Communication Engineering,North China Electric Power University,Baoding 071003,China
Hebei Key Laboratory of Power Internet of Things Technology,North China Electric Power University,Baoding 071003,China
Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology,North China Electric Power University,Baoding 071003,China
国家自然科学基金国家自然科学基金河北省自然科学基金河北省自然科学基金中央高校基本科研业务费专项中央高校基本科研业务费专项Science and Technology Program of Hebei
NETL
NSTL
万方数据
维普
