Zhang Ruilei, Gong Ziyang, Hong Li, Yang Jingsong, Yu Ruihong
Institute of Disaster Prevention, Sanhe 065201, Hebei, China.
Rev Sci Instrum. 2022 Jul 1;93(7):075003. doi: 10.1063/5.0093022.
Strain monitoring is of great significance to identify the failure of key mechanical components and ensure the good operation of mechanical equipment. In terms of the common issue of the low sensitivity of fiber Bragg grating (FBG) strain sensor in strain measurement on the mechanical structure surface, this paper describes a flexible hinge strain sensor with the FBG as the sensitive element. A theoretical analysis of the sensitivity of the sensor is performed, a copper alloy material with a large elastic modulus is selected, the simulation analysis and optimization design for the structural parameters of the sensor are carried out by using ANSYS and Solidworks software, then the object of the sensor is developed according to the simulation results, and finally, the performance of the sensor is tested. The results show that the maximum deformation the sensor can measure is 0.5299 µε, the sensitivity of the sensor is ∼1.8870 pm/µε, which is approximately twice that of the bare FBG sensor, the linearity is greater than 99%, and the relative standard deviation of the repeatability is 0.9%. The results of the study provide a reference for developing the optical fiber strain sensor and further improving its sensitivity.
应变监测对于识别关键机械部件的故障以及确保机械设备的良好运行具有重要意义。针对光纤布拉格光栅（FBG）应变传感器在机械结构表面应变测量中灵敏度较低这一常见问题，本文介绍了一种以FBG为敏感元件的柔性铰链应变传感器。对该传感器的灵敏度进行了理论分析，选取了弹性模量较大的铜合金材料，利用ANSYS和Solidworks软件对传感器的结构参数进行了仿真分析和优化设计，然后根据仿真结果制作了传感器实物，最后对传感器的性能进行了测试。结果表明，该传感器能够测量的最大应变为0.5299 με，灵敏度约为1.8870 pm/με，约为裸FBG传感器的两倍，线性度大于99%，重复性的相对标准偏差为0.9%。研究结果为开发光纤应变传感器并进一步提高其灵敏度提供了参考。
