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将一根光纤上写入两个不同波长的布拉格光栅 ,沿矩形悬臂梁的中性面与表面的交线粘贴于靠近固定端两个相邻侧面 ,利用光纤光栅波长绝对编码的特性 ,实现了应力 (或应变 )与位移的二维实时传感测量。理论分析和实验结果证明 ,通过监测粘贴于梁上的两个光纤光栅波长变化的大小和指向 ,能够实时感测应力、位移等力学量的大小和方向。在与梁轴垂直的方向上 ,获得应力实验灵敏度分别为 5 .32nm/N和 3.2 1nm/N ,位移实验灵敏度分别为 0 .30nm/mm和 0 .4 8nm/mm。
A fiber is written into two different wavelength Bragg gratings along the rectangular cantilever neutral surface and the intersection of the line pasted on the two adjacent sides close to the fixed end of the use of fiber grating wavelength absolute coding characteristics, Two-dimensional real-time sensing of stress (or strain) and displacement. Theoretical analysis and experimental results show that the magnitude and direction of the mechanical quantities such as stress and displacement can be sensed in real time by monitoring the size and orientation of the wavelength changes of the two FBG attached to the beam. In the direction perpendicular to the beam axis, the experimental sensitivity of the obtained stress is respectively 5.32nm / N and 3.2 1nm / N, and the displacement experiment sensitivity is respectively 0.30nm / mm and 0.48nm / mm.