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在考虑波导效应、弹光效应等因素后,详细地理论分析了长周期光纤光栅(LPFG)的横向负载传感特性,包括谐振波长漂移及谐振峰分化后的双峰间距与横向负载、光偏振的关系,模拟计算了单模光纤长周期光栅的横向负载传感特性。理论分析和计算结果表明,长周期光纤光栅谐振波长随横向负载的漂移量和方向与光源的偏振方向有关,加载方向偏振光的谐振波长向短波长漂移,加载正交方向偏振光的谐振波长向长波长漂移,后者的漂移量为前者的2倍以上。横向负载产生的双折射使谐振峰分化为两个子峰,两子峰谐振波长及其间距与横向负载成线性关系,可用于横向负载的高灵敏绝对测量。该结论与已有的长周期光纤光栅横向负载实验结果一致。
Considering the waveguide effect and the pop-up effect, the transverse load sensing characteristics of long period fiber grating (LPFG) are analyzed in detail in detail, including the resonance wavelength drift and the bimodal spacing and transverse loading after harmonic peak differentiation, polarization of light The relationship between the long-period grating and the single-mode fiber has been simulated. The theoretical analysis and calculation results show that the resonance wavelength of the long-period fiber grating with the lateral load is related to the polarization direction of the light source. The resonant wavelength of the polarized light in the loading direction shifts to a short wavelength. The resonant wavelength of the loaded polarized light in the orthogonal direction Long-wavelength drift, the latter drift of the former more than 2 times. The birefringence generated by the transverse load divides the resonance peak into two sub-peaks. The resonance wavelengths of the two sub-peaks and their spacings are linear with the transverse load and can be used for the highly sensitive absolute measurement of the transverse load. The conclusion is consistent with the experimental results of the long-period fiber grating transverse loading.