光纤光栅三维应力传感器的设计与实现

3-Dimensional Strain Sensor in Fiber Bragg Grating

以光纤光栅为敏感元件,设计并实现了一种基于圆柱结构的三维应力传感器.该传感器由三个光纤布喇格光栅等角度粘贴在圆柱体探头而实现.对这种三维传感器应用材料力学理论进行了传感原理的推导与分析,并进行了任意方向上应力大小的传感测量实验.实验表明:这种传感器可以准确测量三维空间任意方向的应力大小及方向,测量线性度高;在0-5N的测量范围内,误差不超过±1.58%,分辨率为9.2×10-3N.

A 3-dimensional strain sensor with fiber Bragg grating （FBG） was designed and realized. The sensor was based on cylinder structure, with three FBGs fixed on surface of cylinder by 120° angle intervals. This 3D sensor was theoretically demonstrated with material mechanics, and experiment was taken with stress of serials on a random direction. Experiment results show that the sensor can measure strain in any direction in 3-dimension space. The measure results have high linearity and error below 1.58% in measure range of 0-5N,and its＇ measure precision can reach 9.2 × 10^-3 N.