【摘要】 分析了一种特殊结构的铝合金空心悬臂梁的受力原理。将光纤Bragg光栅(FBG)粘贴于悬臂梁上,在悬臂梁自由端施加载荷,对BGF的应力响应进行测试。实验结果表明,当所加载荷为200g时,Bragg波长漂移了约为0.215nm;而当梁不为空心时,其漂移量仅为0.019nm,增敏约10倍左右。因此,如果使用弹性材料对FBG进行封装时,通过这种封装结构能够实现对FBG的压力增敏。更多还原

【Abstract】 Strain characteristic of a special hollow aluminium alloy cantilever were analyzed.The fibre Bragg grating(FBG) is sticked to the thin arm of the cantilever and its stress response is observed through OSA when adding load to the free end of the cantilever.The result show that the wavelength of FBG shifts about 0.215 nm when the load is 200 g;and when the cantilever is solid,the wavelength shifts only 0.019 nm.It can be conclude that enhanced-stress ensitivity can be reached through this special structure when using elastic material to coat fibre grating.更多还原