基于三芯Bragg光纤光栅的弯曲曲率计算理论
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摘要
基于Bragg光纤光栅的中心波长随应变发生偏移的特点,提出利用三芯光纤的Bragg光栅进行三维曲率计算的理论.分析了3个光纤光栅的中心波长随曲率半径、中性面到中心的距离、偏转角之间的变化关系,并且用MATLAB进行数值仿真,结果表明反射波长随曲率半径的增加而减小;位于中性面上方的光栅的中心波长的偏移会随中性面和中心的距离d的增加而增加,位于中性面下方的光栅的中心波长的偏移会减小.
This paper proposes a theoretical analysis of measuring three-dimensional bend-curvature by using three-corefiber Bragg grating,based on the characteristics of the three-corefiber Bragg grating's central wavelength shifting with strain.The changes of the central wavelength of the three-core-fiber Bragg grating with the radius of curvature,the distance from neutral plane to the center,and the deflection angle were analyzed and simulated by Matlab.The results show that reflected wavelength will decrease with the increasing of the radius of curvature.The central wavelength shifts of the optical grating above the neutral plane will increase with the increasing of the distance between fiber centre and normal neutral plane,while the central wavelength shifts of the optical grating below the neutral plane will decrease with the increasing of the distance.
This paper proposes a theoretical analysis of measuring three-dimensional bend-curvature by using three-corefiber Bragg grating,based on the characteristics of the three-corefiber Bragg grating's central wavelength shifting with strain.The changes of the central wavelength of the three-core-fiber Bragg grating with the radius of curvature,the distance from neutral plane to the center,and the deflection angle were analyzed and simulated by Matlab.The results show that reflected wavelength will decrease with the increasing of the radius of curvature.The central wavelength shifts of the optical grating above the neutral plane will increase with the increasing of the distance between fiber centre and normal neutral plane,while the central wavelength shifts of the optical grating below the neutral plane will decrease with the increasing of the distance.
引文
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[6]FLOCKHART G M H,MACPHERSON W N,BARTON J S,et al.Two-axis bend measurement with Bragg gratings inmulticore optical fiber[J].Opt Lett,2003,28:387-389.
[7]YUAN Libo.Fiber optic moiréinterferometer[J].Chin PhysLett,1997,14(9):675-677.
[8]YUAN Libo,ZHOU Limin.Fiber optic moiréinterferenceprinciple[J].Optical Fiber Technol,1998,4(2):224-232.
[2]AMANDA F,EUAN J R,ROBERT R,et al.Dynamic two-axis curvature measurement using multicore fiber Bragggratings interrogated by arrayed waveguide[J].Applied Optics,2006,45(12):9041-9048.
[3]周雪芳,梁磊.光纤光栅地震检波器结构设计与性能仿真研究[J].地震工程与工程振动,2005(3):177-180.
[4]COVINGTON C E,BLAKE J,CARRARA S L A.Two modefiber optic bending sensor with temperature and straincompensation[J].Opt Lett,1994,19(9):676-678.
[5]ARAJO F M,FERREIRA L A,SANTOS J L.Simultaneousdetermination of curvature,plane of curvature,andtemperature by use of a miniaturized sensing head based onfiber Bragg gratings[J].Appl Opt,2002,41:2401-2407.
[6]FLOCKHART G M H,MACPHERSON W N,BARTON J S,et al.Two-axis bend measurement with Bragg gratings inmulticore optical fiber[J].Opt Lett,2003,28:387-389.
[7]YUAN Libo.Fiber optic moiréinterferometer[J].Chin PhysLett,1997,14(9):675-677.
[8]YUAN Libo,ZHOU Limin.Fiber optic moiréinterferenceprinciple[J].Optical Fiber Technol,1998,4(2):224-232.
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