Dual-dip long-period fiber gratings for directional bending measurement

被引：5
|
作者：
Zhao, Yunhe [1 ,2 ]
Hua, Ziyang [1 ]
Tang, Mengxue [1 ]
Peng, Huiqin [1 ]
Chen, Siyu [3 ]
Ma, Yuehui [3 ]
Liu, Yunqi [3 ]
He, Zuyuan [2 ]
机构：
[1] Shanghai Maritime Univ, Inst Logist Sci & Engn, Shanghai 201306, Peoples R China
[2] Shanghai Jiao Tong Univ, State Key Lab Adv Opt Commun Syst & Networks, Shanghai 200240, Peoples R China
[3] Shanghai Univ, Key Lab Specialty Fiber Opt & Opt Access Networks, Shanghai 200444, Peoples R China
来源：
OPTICS COMMUNICATIONS | 2023年 / 549卷
基金：
中国国家自然科学基金;
关键词：
Optical fiber sensor; Long-period fiber gratings; Bending measurement;
D O I：
10.1016/j.optcom.2023.129901
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A high-sensitivity bending sensor based on dual-dip long period fiber gratings (LPFGs) in a single-mode fiber is proposed. The length of the gratings is very short only 7.2 mm. The asymmetric perturbation in fiber is generated during the fabrication, which makes the dual-dip LPFGs show different bending sensing characteristics at opposite directions. Meanwhile, the highest bending sensitivity of -35.91 nm/m- 1 and -20.74 dB/m-1 can be obtained at bending directions of 0 degrees and 180 degrees, respectively. Furthermore, the torsion and temperature sensing characteristics are investigated experimentally. The torsion sensitivities follow sine function showing potential for directional sensing. The temperature sensitivities are 41.9 p.m./degrees C and 45.1 p.m./degrees C are close, which can eliminate the cross-sensitivity to temperature.
引用
收藏
页数：7
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