【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.更多还原

【Abstract】 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.更多还原