摘要
基于光纤光栅应变传感的基本原理以及弹塑性力学的基本理论,考虑环境-封装基体-粘接层(或涂层)-纤芯之间的轴向和径向弹塑性力学耦合机制,建立了光纤光栅应变传感器光-力转换的非线性方程。传感器样本光-力转换的计算与测试结果,均显示出非线性特征,且两者基本一致。所得结果还显示,粘接层的厚度变薄,在提高传感器光-力转换效率的同时,还会使出现光-力转换非线性效应的临界应变前移,因而扩大出现非线性效应的应变范围。据此,实际的传感器设计时,除考虑采用高模量的粘接材料外,还可利用光-力转换的非线性方程,通过粘接层厚度的调整,对传感器的灵敏性和光-力转换的特征进行均衡优化。
Based on the basic principle of Fiber Optical Bragg Grating（FBG） strain sensing and the basic theory of elasto-plastic mechanics,considering the axial and radial mechanical coupling mechanism among environment-packaging-matrix-adhesive layer（coating）-optic-fiber core,a nonlinear opto-mechanical transformation equation for FBG sensors was established.The tested and calculated opto-mechanical transformation results for sensor samples both exhibit the characteristic of nonlinearity and are close each other quantitatively.It is also shown that as the adhesive layer thickness gets thinner,the critical minimum strain around which the nonlinear characteristic of optic-mechanical transformation starts becomes smaller,and thus the strain range of nonlinear strain transferring tends to be larger.Therefore,for practical sensor design,apart from selecting higher modulus adhesive materials,the comprehensive optimization between the sensitivity and character of optic-mechanical transformation can be performed through adjusting the adhesive layer thicknesses.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2010年第9期1946-1951,共6页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(50878152)
中国博士后基金(20080440651)资助项目
关键词
光纤光学
固体力学
光纤光栅
应变传感
光-力转换
非线性方程
fibre optics
solid mechanics
FBG
strain sensing
opto-mechanical transformation
nonlinear equation
