基于光纤布喇格光栅的测斜技术实验研究

与传统的测斜仪相比,基于光纤布喇格光栅(FBG)的测斜技术可实现自动实时监测。该文首先介绍了基于光纤光栅传感技术的测斜仪,通过建立理论模型和差分算法,根据测点处FBG测得的应变值计算出该点的挠度值,并将此挠度值与百分表实测挠度进行对比。通过实验验证了光纤光栅测斜技术的可行性。同时对FBG粘贴在3种材质测斜管表面的应变传递率进行了标定。结果表明,在聚氯乙烯(PVC)管的应变传递率可达95%,且PVC管的价格低,因此更适合在实际工程中应用。

Experimental Study on Incline measurement Technology Based on Fiber Bragg Grating

Compared with the convention inclinometer, the incline measurement technology based on FBG can realize automatic real time monitoring. Firstly, the inclinometer based on FBG is introduced. Then the deflection value of the measuring point is calculated according to the strain measured by FBG through the theoretical model and the difference algorithm, and compared with the measured deflection value in the dial indicator. The feasibility of incline measurement technology based on FBG is verified by experiment, and the strain transfer rate of FBG bonded on the surface of the inclined tube fabricated by three kinds of materials is calibrated. The experimental results show that the strain transfer rate of PVC tube is 95%. Since the price PVC tube is relatively low, it is more suitable for engineering applications.