激光与光电子学进展, 2018, 55 (3): 030605, 网络出版: 2018-09-10
新型双环减敏式光纤布拉格光栅应变传感器 下载: 1082次
New Double-Loop Desensitization FBG Strain Sensor
光纤光学 布拉格光栅 双环减敏结构 应变传感器 结构监测 fiber optics Bragg grating double-loop desensitization structure strain sensor structure monitoring
摘要
设计了一种双环减敏式结构,并对26 mm长的减敏基片进行有限元分析,分别在减敏基片左右端面各施加0.065 mm的拉伸与压缩位移。由仿真结果可得减敏基片的应变减敏比约为3.5,应变测量范围可达到±5000 με,同时可保证减敏基片在其材料的弹性范围内运行,不影响传感器的使用寿命。通过对500 με范围内的双环减敏结构的光纤布拉格光栅传感器进行拉伸实验,实验结果表明该结构设计可使得传感器线性度达到0.999以上,满量程精度约为0.1%。该传感器可实现实时准确的在线监测,系统数据采集迅速、可靠性极高,有望应用于如船舶、桥梁、飞行器等需要对关键结构进行较大应变范围测量的情况。
Abstract
A double-loop desensitization structure is designed. The finite element analysis of the 26 mm long desensitization substrate is carried out. The tensile and compressive displacements of 0.065 mm are applied to the left and right ends of the desensitization substrate, respectively. The simulation result shows that the desensitization ratio of the desensitized substrate is about 3.5 and the strain measurement range can reach ±5000 με. The desensitization substrate can be operated within the elastic range of the material without affecting the service life of the sensor. The tensile test of fiber Bragg grating (FBG) with double-loop desensitization structure in the range of 500 με shows that the linearity of the sensor is over 0.999, and the full scale accuracy is about 0.1%. The sensor can achieve real-time accurate online monitoring, rapid system data acquisition, and high reliability. It is expected to be applied to the situations where the larger strain range of key structures is needed to be measured, such as ships, bridges, aircraft, and so on.
朱星盈, 刘化利, 倪屹, 郭瑜. 新型双环减敏式光纤布拉格光栅应变传感器[J]. 激光与光电子学进展, 2018, 55(3): 030605. Xingying Zhu, Huali Liu, Yi Ni, Yu Guo. New Double-Loop Desensitization FBG Strain Sensor[J]. Laser & Optoelectronics Progress, 2018, 55(3): 030605.