弯曲长周期光子晶体光纤光栅传感器的研究

Research of long period bending photonic crystal fiber grating sensors

为了研究弯曲长周期光子晶体光纤光栅传感器谐振波长漂移量与光栅弯曲形变的关系,采用耦合模理论和计算机模拟方法进行了理论计算和仿真研究,推导出弯曲光子晶体光纤长周期光栅谐振波长表达式,设计了一般弯曲长周期光子晶体光纤光栅传感器系统模型,分析了弯曲长周期光子晶体光纤光栅传感器的基本工作原理,并计算了长周期光子晶体光纤光栅弯曲曲率、光栅有效折射率和谐振波长与弯曲应变的关系。结果表明,随着光栅弯曲形变的增加,光栅的曲率会增加,光栅传感器的谐振波长漂移量会增加,光栅每发生1με变化,光栅谐振波长的漂移量变化0.014nm。

In order to study the relationship between the resonant wavelength drift and the grating bending strain of a long period bending photonic crystal fiber grating sensor,based on the coupled mode theory and programming simulation,the resonant wavelength expression of long period bending photonic crystal fiber gratings was deduced. The system model of a general bending photonic crystal fiber grating sensor with long period was designed. The basic principle of the sensor was analyzed. The relationship between the bending curvature,grating refractive index,sensor resonance wavelength and grating bending strain was calculated. The results show that the grating curvature increases with the increase of the bending strain of the grating,and the resonance wavelength drift of the grating sensor increases too. The resonant wavelength drifts0. 014 nm with 1με change of the grating.