基于球形长周期光纤光栅的宽动态范围位移传感器实验研究

Displacement sensor with a wide dynamic range based on a balloon-like long-period fiber grating

[目的]针对光纤位移传感器动态范围窄的问题,设计一种结构简单、易于制备的气球形长周期光纤光栅(LPFG)位移传感器。[方法]采用RSOFT软件进行仿真与优化,得到光纤在不同曲率下的光谱形态,以此来确定测量区间。通过将多模光纤周期性嵌入单模光纤形成的气球形长周期光纤光栅(MMF-BLPFG),提供用于测量位移的参考峰。使用精密的连续切割装置作为实验基础,制备与仿真结果一致的实验样品进行测试。[结果]通过测量2个谐振峰的漂移,实现了36 mm的最大位移测量范围。[结论]该研究成果在舰船水下疏水空间管系的稳定性测量和连续监测等需要大规模测量的场景中具有良好的应用潜力。

[Objective]Aiming at the problem of the narrow dynamic range of current optical fiber displacement sensors,a balloon-like long-period fiber grating(LPFG)displacement sensor with a simple structure and easy preparation method is designed.[Methods]Based on simulation and optimization by RSOFT software,the measurement range is determined by the balloon-like optical fiber under different curvatures.A multimode fiber balloon-like LPFG(MMF-BLPFG)formed by periodically embedding multimode fiber(MMF)into single-mode fiber(SMF)provides a reference peak for measuring the displacement.Using a precise continuous cutting device as the experimental basis,test samples consistent with the simulation results are prepared for testing.[Results]The maximum displacement measurement range of 36 mm is achieved by measuring the drift of two resonance peaks.[Conclusions]The proposed sensor has good application potential in large-scale measurement scenarios such as the stability measurement and continuous monitoring of the underwater drainage space piping systems of ships.