Pan Jianjun, Hou Wei, Wang Liangying, Zou Zisong, Xiao Fan
Appl Opt. 2022 Oct 1;61(28):8172-8179. doi: 10.1364/AO.468686.
A novel high-sensitivity fiber Bragg grating (FBG) strain sensor is reported, to the best of our knowledge. The sensitivity of the sensor is improved by fixing the FBG on an elastic substrate with a sensitization function. The sensitization principle of the designed sensor is introduced, and the mathematical model of the sensor is established. In the static and dynamic experiments of the sensor, the effect of adhesive between the sensor and the measured structure on the sensitivity of the FBG strain sensor is experimentally investigated. The experimental results show that the adhesive with high shear strength is beneficial to the realization of a high-sensitivity sensor. The sensor fixed with planting bar glue can achieve a sensitivity of 9.42 pm/µε, a repeatability error of 4.79%, and a hysteresis error of 3.36%, which is consistent with theoretical and simulation results. The designed high-sensitivity strain sensor has a simple structure, small size, and convenient installation, so it has a good application prospect in micro-strain monitoring.
据我们所知，本文报道了一种新型高灵敏度光纤布拉格光栅（FBG）应变传感器。通过将FBG固定在具有增敏功能的弹性基板上来提高传感器的灵敏度。介绍了所设计传感器的增敏原理，并建立了传感器的数学模型。在传感器的静态和动态实验中，通过实验研究了传感器与被测结构之间的粘合剂对FBG应变传感器灵敏度的影响。实验结果表明，具有高剪切强度的粘合剂有利于实现高灵敏度传感器。用植筋胶固定的传感器灵敏度可达9.42 pm/με，重复性误差为4.79%，滞后误差为3.36%，与理论和仿真结果一致。所设计的高灵敏度应变传感器结构简单、尺寸小、安装方便，在微应变监测中具有良好的应用前景。
