基于长周期光纤光栅的折射率与浓度传感方案的研究

Study on Refractive Index and Concentration Sensor Based on Long-Period Fiber Grating

摘要: 采用简化的3层光纤模型，利用耦合模理论对长周期光纤光栅周围环境折射率、浓度敏感特性进行研究，并用计算机进行模拟及数值计算．得出长周期光纤光栅透射谱谐振波长与环境折射率及浓度的关系．实验证明测量结果与计算机模拟结果基本吻合。

Abstract: Based on the simplified three-layered model,long-period fiber grating's sensitivity to the surrounding refractive index and concentration is analyzed with the couple-mode theory. Computer was use to simulate and calculate the numerical value of the grating, and to achieve the relation between the resonance wavelength of LPG's transmittance and the surrounding refractive index and concentration. The experimental results fit the computer simulation results well.