Zhang Ruilei, Wu Xi, Hong Li, Jin Jiheng, Li Guoxi
Appl Opt. 2022 Dec 10;61(35):10567-10573. doi: 10.1364/AO.475556.
Strain measurement has important applications in mechanical engineering, civil engineering, aerospace, earthquake monitoring, and other fields. Aiming at the problem of low sensitivity of existing fiber Bragg grating (FBG) strain sensors, a high-sensitivity FBG strain sensor of the substrate type with a sensitization structure is proposed. The sensitivity of the sensor is analyzed theoretically, the sensor is simulated by Solidworks and ANSYS software, and the structural parameters are optimized. According to the simulation results, the real sensor is developed, and the strain test system is built to test the performance of the sensor. The results show that the strain sensitivity of the sensor is 3.21 /µε, which is about 2.7 times that of the bare FBG strain sensor, which is basically in line with the theoretical value. The fitting linear correlation coefficient is 0.9999, and the repeatability error is 3.9%FS. The research results provide a reference for developing the same type of sensors and further improving the sensitivity of fiber strain sensors.
应变测量在机械工程、土木工程、航空航天、地震监测等领域有着重要应用。针对现有光纤布拉格光栅（FBG）应变传感器灵敏度低的问题，提出了一种具有增敏结构的衬底型高灵敏度FBG应变传感器。对传感器的灵敏度进行了理论分析，利用Solidworks和ANSYS软件对传感器进行了仿真，并对结构参数进行了优化。根据仿真结果，研制了实际传感器，并搭建了应变测试系统来测试传感器的性能。结果表明，该传感器的应变灵敏度为3.21 /με，约为裸FBG应变传感器的2.7倍，基本符合理论值。拟合线性相关系数为0.9999，重复性误差为3.9%FS。研究结果为同类传感器的研制及进一步提高光纤应变传感器的灵敏度提供了参考。
