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沉降仪是测量路基、桥梁、隧道、边坡等结构物沉降的重要仪器。利用上、下容器相连通结构,研制了一种水杯式光纤Bragg光栅沉降仪。当沉降发生时,在压差的作用下,膜片产生的挠度推动传压杆使等强度悬臂梁的自由端产生同样大小的挠度变化,使粘贴于等强度悬臂梁表面的光纤Bragg光栅发生拉伸,进而导致中心波长发生移位,实验通过检测波长移位可获得沉降量。分析结果显示,光纤Bragg光栅波长移位对沉降量呈现良好的线性关系,沉降仪的灵敏度可达15.4pm/cm,线性度为1.73%FS,迟滞为0.984%FS,重复性误差为3.61%FS。
Settlement instrument is to measure the subgrade, bridges, tunnels, slopes and other structures settlement important instrument. A cup-type fiber Bragg grating settler was developed by connecting the upper and lower containers. When the settlement occurs, under the effect of pressure difference, the deflection generated by the diaphragm pushes the pressure transfer rod to make the free end of the cantilever beam of the same strength change in deflection, so that the fiber Bragg grating pasted on the surface of the cantilever beam of the same intensity Stretch, and then lead to shift the center wavelength, the experiment by detecting the wavelength shift can be obtained settlement. The results show that the wavelength shift of the fiber Bragg grating shows a good linear relationship with the settlement. The sensitivity of the sedimentation instrument is up to 15.4pm / cm, the linearity is 1.73% FS, the hysteresis is 0.984% FS and the repeatability error is 3.61% FS .