Multifunctional fiber-optic sensor, based on helix structure and fiber Bragg gratings, for shape sensing

被引：25
作者：
Liu, Yin [1 ]
Zhou, Ai [2 ]
Yuan, Libo [3 ]
机构：
[1] Harbin Engn Univ, Coll Sci, Photon Res Ctr, Key Lab Fiber Integrated Opt,Minist Educ, Harbin 150001, Peoples R China
[2] Wuhan Univ Technol, Natl Engn Lab Fiber Opt Sensing Technol, Wuhan 430074, Peoples R China
[3] Guilin Univ Elect Technol, Sch Elect Engn & Automat, Guilin 541000, Guangxi, Peoples R China
来源：
OPTICS AND LASER TECHNOLOGY | 2021年 / 143卷
基金：
中国国家自然科学基金;
关键词：
Directional twisted sensor; Vector bending sensor; Triangle-four core fiber; Helical structure; LONG-PERIOD FIBER; TEMPERATURE; TORSION; STRAIN;
D O I：
10.1016/j.optlastec.2021.107327
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In order to realize the simultaneous measurement of directional torsion and vector bending, a multifunctional fiber-optic sensor, based on helical-twisted-structure-assisted fiber Bragg gratings (HTSA-FBGs) on a triangular four-core fiber (TFCF), is proposed. The helical-twisted region (HTR) was fabricated using CO2 laser beam. FBGs were prepared in the HTR of the TFCF cores through the defocusing phase mask method. The sensing mechanism of directional torsion and vector bending was analyzed. The influence of temperature and strain can be eliminated by subtracting the wavelength change of the central core HTSA-FBG from the wavelength change of the side core HTSA-FBGs, so shape accuracy can be improved. The torsion sensitivity can be changed by adjusting the pitch of the HTR.
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页数：7
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