【摘要】 分析了光纤Bragg光栅的应变响应原理,通过实验观察光纤光栅粘贴在厚度不均的悬臂梁上产生的双峰响应,证明悬臂梁结构的不均匀会使整个光纤光栅受到不同的应力而产生两个反射峰,并且两个反射峰之间的距离随着应力的增加呈线性变化。实验中,当载荷为200g时,两个反射峰之间距离达到0.16nm,而温度变化不会引起两个反射峰之间的变化。利用这种结构的封装,可以克服光纤光栅对温度和应力交叉敏感的问题,消除温度变化引起的应力测量误差,实现一个光纤光栅对应力单参量的测量。更多还原

【Abstract】 The strain and temperature responses of fibre Bragg grating(FBG) are a nalyzed. The dual-peak response of a single FBG that sticked to a cantilever th a t has asymmetric structure is observed. The results show that a single fibre Bra gg grating produce two reflecting peaks because of the different strain distribu tion in the asymmetric cantilever. In the experiment, when the load changes from 0 to 200g, the distance between two peaks increase 0.16nm. And the changes of d istance between two peaks are linear to the changes of load while temperature do esn’t affect the distance between two peaks. So it can solve the problem of cros s-sensitivity of temperature and stress and eliminate the error induced by the shift of temperature when this kind of structure is used to coat the FBG.更多还原