双悬臂梁式光纤Bragg光栅位移传感器

Fiber Bragg Grating Displacement Sensor with Double Cantilever beam

位移测量装置利用测量杆通过楔形块作用在固定于底座的等强度悬臂梁上,其中,光纤Bragg光栅粘贴于其中一块等强度悬臂梁外表面的中心线处。在测量中,当测量杆产生位移时,会带动楔形块产生相应的位移,并促使等强度悬臂梁的自由端产生扰度变化,从而导致粘贴于等强度悬臂梁外表面的光纤Bragg光栅产生波长移位。实验表明,当位移增加或者减少时,位于中心测点的光纤Bragg光栅的实验灵敏度分别为正行程0.015nm/mm,反行程为0.014nm/mm,重复性误差为2.2%;正行程的线性度为0.99728,反行程的线性度为0.99684,迟滞为0.0626%FS。

Through wedge,displacement measuring device utilize measuring rode to operate on equal strength cantilever which fixes on base.Besides that,in one of these equal strength cantilevers,the fiber Bragg grating sticks to the centerline of its outer surface.In measurement process,the displacement of measure rode derives wedge to produce corresponding displacement.Moreover,the displacement changes the deflection of the free end on equal strength cantilever,which results in shifting wavelength length on the fiber Bragg grating simultaneously.In the case of shifting displacement,the experiment result of the fiber Bragg grating on central measuring point is shown as follows.The sensitivity of fiber Bragg grating on positive routine is 0.015nm/mm.Correspondingly,its sensitivity on negative routine is 0.014nm/mm,and its repeatable error is 2.2%.On the other hand,the linearity of it on positive routine is 0.99728.Furthermore,its linearity on negative routine is 0.99684,and its sluggish is 0.0626%FS.