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对均匀光纤Bragg光栅(FBG)局部横向受力特性进行了理论和实验研究.采用传输矩阵法分析了FBG其中一段横向受力时的反射光谱变化,并且建立了相应的数学模型.研究表明,当FBG局部横向受力时,受压长度对反射光谱无影响,反射光谱分裂点的波长与横向作用力呈线性正比关系并具有周期性,分裂点反射率与受力位置的关系为近似双曲正切关系.
Theoretical and experimental research on the local transverse force characteristics of uniform fiber Bragg grating (FBG) is carried out.Transmission matrix method is used to analyze the change of the reflection spectrum of one section of FBG under lateral force, and the corresponding mathematical model is established.Research shows that when When the FBG is subjected to lateral transverse force, the compression length has no effect on the reflection spectrum. The wavelength of the reflection spectrum splitting point has a linear and proportional relationship with the lateral force and has a periodic relationship. The relationship between the reflectivity of the splitting point and the force position is approximate hyperbolic tangent relationship.