摘要
基于弱反射光纤布拉格光栅应变传感器,建立了光栅反射光谱仿真模型。分析了光纤光栅的长度、周期和排列顺序对光栅反射率的影响,发现光栅的最大反射率随光栅长度和调制深度的增大而变大;而光谱宽度受光栅长度变化的影响较大,光栅长度越小,光谱宽度越大。弱反射光栅阵列的峰值反射率与光栅位置有关,受多重反射影响,越下游的传感光栅,峰值反射率越小。通过分析解调过程中的反射光谱,得到了传感器所受应变与输出光强的函数关系。
Based on the strain sensor of weak reflection fiber Bragg grating,the model of grating reflection spectrum is established,and the influence of grating length,period and arrangement order on the grating reflectivity is analyzed. It is found that the maximum reflectivity of grating increases with the increase of grating length and modulation depth,while the spectral width is greatly affected by the change of grating length:the smaller the grating length,the larger the spectral width. The peak reflectivity of the weak reflection grating array is related to the position of the grating. Being affected by multiple reflections,the lower the sensor grating,the smaller the peak reflectivity. By analyzing the reflection spectra in the demodulation process,the functional relationship between the strain of the sensor and the output light intensity is obtained.
作者
王若聆
李军
莫宗来
Wang Ruoling;Li Jun;Mo Zonglai(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2019年第2期224-229,共6页
Journal of Nanjing University of Science and Technology
关键词
匹配光栅
弱应变
光纤光栅传感器
解调过程
matched grating
weak strain
fiber grating sensors
demodulation process
